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Conference Abstracts

  • ORAL=20 PRESENTATIONS |=20
  • POSTERS=20

ORAL PRESENTATIONS

  • Modeling:=20 Case Studies |=20
  • Modeling=20 to Elucidate Processes |=20
  • Human=20 Impacts Causing Seawater Intrusion |=20
  • Modeling:=20 Techniques |=20
  • Intrusion=20 in Karst Aquifers |=20
  • Intrusion=20 in Sedimentary Aquifers |=20
  • Submarine=20 Groundwater Discharge |=20
  • Intrusion=20 Barriers |=20
  • Geophysics=20



Modeling: Case Studies


SWIMED Consortium (Lecca G)
Overview of the = scientific=20 results of the EU INCO project Sustainable Water management In = Mediterranean=20 coastal aquifers (SWIMED)

The SWIMED project (Jan 2003-Jun 2006) has been an attempt to assess = all the=20 technical and scientific requirements in the framework of an Integrated=20 Saltwater Intrusion Management and Monitoring, i.e. the steps involved = in data=20 collection and organisation, monitoring, mathematical modelling, = simulation and=20 associated computer tools, and implementation for optimal aquifer = exploitation=20 and artificial recharge under seawater intrusion constraints.The general = objectives of the project were: (1) development of an integrated = approach=20 coupling models to GIS, (2) optimisation aspects while considering = effects of=20 artificial recharge and seawater intrusion for sustainable water = resources=20 management in coastal groundwater systems, (3) development of = appropriate=20 databases linked to GIS systems for a better visualisation of field = sites data=20 sets, (4) determination of the optimal conditions for artificial = recharge and=20 aquifer water management under seawater intrusion stress with = application to=20 selected sites in some coastal Mediterranean areas, (5) strengthening = scientific=20 and technological cooperation of the partner institutions in north and = south=20 Mediterranean countries, and research capacity building. The main = achieved=20 results of the project can be summarized as water resources management = scenarios=20 based on site characterization and advanced software tools (GIS/DB and = seawater=20 intrusion/optimization models) for the sites: (1) The R=EDo Velez = alluvial coastal=20 aquifer (Andalusia, Spain); (2) The Akrotiri coastal aquifer in Cyprus; = (3) The=20 Souss coastal aquifer near the city of Agadir (Morocco); (4) The Gaza = coastal=20 aquifer (Gaza Strip, Palestine); (5) The Cap Bon coastal aquifer near = the city=20 of Tunis (Tunisia); (6) The Muravera-Flumendosa coastal aquifer = (Sardinia,=20 Italy).The work aims at giving an overview of SWIMED project = achievements by=20 means of a description of the proposed integrated approach and its = computer=20 implementation for selected sites, to facilitate comparative analysis = between=20 coastal aquifers in the Mediterranean basin and promote further research = and=20 application. Among the issues that will be covered are the = implementation=20 criteria for monitoring networks based on field investigation, the = impact of the=20 exploitation rate uncertainty on seawater intrusion by means of = stochastic=20 modelling, the calibration of a 3D groundwater model, and the numerical=20 assessment of seawater intrusion in aquifer systems.

Allen DM, Liteanu E
Long-Term Dynamics Of The=20 Saltwater-Freshwater Interface On The Gulf Islands, British Columbia,=20 Canada

Transient density-dependent flow and solute transport simulations = were=20 carried out for Saturna Island, Gulf Islands, southwest British = Columbia, Canada=20 using USGS SUTRA to model the behaviour of the freshwater-saltwater = interface=20 over the last 12,000 years. Previous groundwater chemistry sampling = indicated=20 that cation exchange, whereby Ca-HCO3 rich freshwater exchanges with Na, = is a=20 dominant chemical mechanism affecting the interaction of groundwater and = the=20 bedrock aquifer. While Na-enriched water is present in groundwater = throughout=20 most of the island, at depth and near the coast, there are higher = concentrations=20 of Cl, which is consistent with the presence of a saltwater wedge. The = origin of=20 Na is speculated to originate from remnant seawater, which was = introduced (along=20 with Cl) into the rock sequence during the Pleistocene when the islands = were=20 submerged. Isostatic rebound, following submergence, has removed Cl, by = flushing=20 the aquifer with fresh (HCO3 rich) infiltrating groundwater. The Na has = largely=20 remained in place because of sorption to clay minerals, but is now being = released as fresh water continues to infiltrate. This study aimed = firstly to=20 test the hypothesis that a 1,000 year period (between ice retreat and=20 post-glacial rebound roughly 12,000 years ago) was sufficient to result = in at=20 least partial saturation of the island with seawater. Secondly, the = study aimed=20 to test if chloride has had sufficient time to be removed from shallow = and=20 intermediate aquifer depths, and be at higher concentrations at depth = near the=20 coast. Simulation results show that, considering the approximations used = for=20 defining both the hydraulic properties of the aquifer and the amount of = recharge=20 to the aquifer, the conceptual model is consistent with the Pleistocene = sea=20 level history for the area. Saltwater is able to intrude and "saturate" = the=20 aquifer over a period of roughly 500-1000 years, and the current Cl = distribution=20 is consistent with that predicted by the model.

Kerrou J, Renard P, Lecca G
A Geostatistical = Model Of=20 Exploitation Rates And Its Impact On Sea-Water Intrusion In The Korba = Aquifer=20 (Tunisia)

The Cape Bon peninsula, located 50 km South-East of Tunis, is one of = the most=20 productive agricultural areas in Tunisia. At the same time, it is = suffering=20 heavily from water scarcity and salinization due to seawater intrusion = in the=20 Korba aquifer. Although the local water management authority developed=20 alternative freshwater sources by means of dams and surface water = irrigation=20 systems, farmers still need to exploit groundwater resources, due to the = large=20 variability of climatic conditions. In 1996, the Korba aquifer was = exploited by=20 7300 wells for a total amount of 50,106 m3. World Bank analysis shows = that=20 agricultural productivity levels are still increasing while available = water=20 resources are already fully exploited, prospecting major water problems = in the=20 next decade. Groundwater balance estimates in the area show that one of = the=20 major sources of uncertainty is the evaluation of the aquifer = exploitation.=20 Indeed, no precise information is recorded by the local authority and = farmers=20 regarding actual extraction rates and their time evolution. In addition, = the=20 well distribution in the plain is particularly dense towards the coast,=20 determining a withdrawal distribution, which tends to accentuate the = seawater=20 intrusion. Knowledge of spatial and temporal exploitation distribution = is=20 crucial to understand the dynamic of the aquifer, to model the seawater=20 intrusion and to investigate optimal management scenarios. In this = paper, we=20 present a multivariate analysis aiming to reduce the uncertainty in the=20 estimation of the exploitation rates using indirect information = including: crop=20 survey, surface water irrigation records, remote sensing of actual=20 evapotranspiration rates, and groundwater levels. Using this = complementary data,=20 a geostatistical model of exploitation rates is reconstructed. Due to = the=20 density of the wells in the coastal area, extractions are simulated on a = regular=20 grid. This requires an adequate change of support (block-simulation). = Then the=20 impact of the exploitation uncertainty on the sea-water intrusion is = evaluated=20 with Monte Carlo simulations, based on a 3D density-dependent = groundwater flow=20 and salt transport model. Acknowledgements. This work is financed by the = EC INCO=20 SWIMED project contract no. ICA3-2001-20004 and by the Sardinia Regional = Authorities (L.R. 19/96 International Cooperation for development).

Gaaloul N, Cheng AHD, El Heni M, Mechergui M =
Using=20 Groundwater Flow Model for the potentiality of the Sustainable Aquifer=20 ManagemCase ent Study: the Grombalia aquifer (Cap Bon, Northern=20 Tunisia)

This study examines an approach for planning groundwater development = in=20 coastal aquifers. The seawater intrusion is controlled through a series = of=20 barrier extraction wells. The multi-objective management problem is cast = as a=20 nonlinear, nonconvex combinatorial model and is solved using a coupled=20 simulation=96optimization approach. A density-dependent groundwater flow = and=20 transport model, SEAWAT is used for simulating the dynamics of seawater=20 intrusion. The Simulated Annealing algorithm is used for solving the=20 optimization problem. The physical characteristics of the coastal = aquifer of=20 Grombalia in the Cap Bon in the North of Tunisia, were determined by = using GMS=20 software MODFLOW Code. This was helped in the quantification of the = aquifer=20 inflows and discharges as well as to the aquifer sustainability = management,=20 especially in the interaction between the Upper and Lower Aquifers for = the area.=20 The utility of the study is demonstrated through a trade-off curve = between=20 prioritizing groundwater development and controlling seawater intrusion = at=20 desired levels. Key words: Modeling, Groundwater Management, Seawater = intrusion,=20 Grombalia, Tunisia.

Nienhuis P, Kamps P, Schaars F
Amsterdam Water = Supply=20 Dunes: Historical Field Data 1904-2004 Used to Validate 100 Years = Movement of=20 Salt/Fresh Water Interface Simulated with the SWI-package

The Amsterdam water Supply dune area in the W-part of the Netherland = has been=20 used since 1853 for production of drinking water for Amsterdam. The = water is=20 contained in a fresh water lens fed by recharge from precipitation in an = otherwise salt/brackish multi-aquifer system. Abstraction commenced = using=20 dedicated canals, later on (starting early 20 th century) = using wells=20 tapping deeper aquifers. As a consequence of the abstraction the fresh = water=20 lens became smaller, to recover only after the late 1950s when = artificial=20 replenishment with prepurified Rhine river water started. The response = time of=20 the system to changes in hydrological regime probably lies in the order = of=20 centuries, based on estimates by Bakker (1981) of the time needed for = the fresh=20 water lens to have been formed.

The archives of Amsterdam Water = Supply=20 and of the municipality of Amsterdam contain a wealth of historical data = about=20 the dunes and the hydrology, some dating back to the very start of the=20 abstraction. The monitoring programme has been expanded continuously = ever since=20 1853, presently incorporating some 1700 piezometers in the dune area = proper and=20 numerous others in surrounding areas, plus many chemical analyses, = salinity,=20 water balance and meteorological data. All data from after 1974 are all=20 available in digital form. It is intended to have all data digitally = available=20 to be able to use them for simulation of the entire abstraction history = from=20 1853 to present.
As data are available spanning a similar period, = the=20 Amsterdam Water Supply dune area is one of the perhaps very few areas in = the=20 world where salt/fresh groundwater model codes can be verified and = validated=20 using simulation times approaching the actual system response time. = Amsterdam=20 Water Supply itself needs properly verified model codes and validated = models to=20 allow reliable simulations of long-term future abstraction and = groundwater=20 management scenarios.

As an example of the use of these data an attempt has been made to = validate=20 the current transient groundwater model AMWADU (Kamps and Schaars, = 2006), which=20 was calibrated for the period 1990-2005, by simulating the salt/fresh = interface=20 movements in the period 1904 =96 2004. A number of historical data have = been=20 digitized and historical salt/fresh interface positions inferred from = chemical=20 analyses and salinity data of samples from piezometers; the earliest = reasonably=20 complete 3-dimensional overview of the interface was from 1925, and = sparse data=20 were available for 1904. The starting position of the salt/fresh = interface in=20 1904 was inferred by extrapolating the initially simulated salt/fresh = interface=20 movement vectors for the year 1925 back in time to 1904.

The results of several model runs show that (1) the system is very = sensitive=20 for perturbations in hydrological build-up and initial position of the=20 salt/fresh interface (or rather: initial amount of fresh water in the = system);=20 (2) a reasonable fit is obtained in places where the historical = positions of the=20 interface are fairly well documented; (3) the simulation results do not = properly=20 fit historical data where little information is present and the = historical=20 interface positions are uncertain, e.g. especially along the = coast.
The most=20 important conclusion to be drawn from this study is that for long term=20 simulations for e.g. climate change, salt/fresh interface movements = should to be=20 taken into account explicitly because of the delicate equilibrium of the = salt/fresh groundwater system as apparent from the simulation runs.

Schneider A, Fein E
Modelling Freshwater Lenses = And=20 Seawater Intrusion Using D3f And R3t

Monitoring and protection of the water quality in freshwater lenses = is an=20 important part of public precaution for many islands. For that reason it = is=20 important to achieve an improved comprehension on the influences of = several=20 processes on the development of freshwater lenses. Simulation works are = carried=20 out to model the freshwater lense of the East Frisian Island Langeoog. = The=20 modelled domain extends over 2 km x 1.4 km x 70 m and is situated in the = central=20 part of the island, where the abstraction wells of the water works are = located.=20 The model consists of six layers. The Lauenburg Clay, covering the = western part=20 of the basement, is covered by Pleistocene sands and two thin layers of = silt=20 within sands of tidal flat and dune sands. First the development of the=20 freshwater lense to its present extention is modelled using the = software-package=20 d3f. In a second step fresh water abstraction is taken into account. = Finally,=20 several scenarios are regarded, such as an increased water abstraction = and an=20 intrusion of sea water by flooding. The transport of chloride- and=20 potassium-ions is modelled with help of r3t, based on the velocity = fields=20 provided by d3f. d3f (distributed density driven flow) is a software = package for=20 the modelling of groundwater flow with variable density through large,=20 three-dimensional, and hydrogeologically complex areas. It is based on = finite=20 volume methods on unstructured grids, a BiCGStab-algorithm, and linear = multigrid=20 techniques. r3t (radionuclides, reaction, retardation, and transport) is = a=20 program for the modelling of pollutant or radionuclide transport and = specific=20 retention processes such as equilibrium and kinetically controlled = sorption,=20 diffusion into immobile pore waters, and precipitation. These two = software=20 packages can be run both on workstations and massively parallel = computers.

Barbieri M, Alcolea A, Bea SA, Carrera J, Castro=20 E
Geostatistical Modelling Of A Coastal Aquifer Using = The=20 Response To Tidal Fluctuations As Calibration Data

Head fluctuations at coastal wells caused by tidal fluctuations may = be a=20 cheap way to provide aquifer scale effective hydraulic diffusivity and=20 heterogeneity patterns. In this work, we present the methodology to do = it both=20 for ideal conditions (homogeneous, straight coastline), using analytical = solutions, and general heterogeneous conditions, using geostatistical = inversion.=20 We apply the methodology to hydrogeological modelling of a small = contaminated=20 zone near the coast of Tarragona (Spain). Characterization of hydraulic=20 properties is a necessary step for the posterior remediation design. The = aquifer=20 is composed by a high-conductive anthropogenic filling, placed over a = quaternary=20 gravel conglomerate; an important peculiarity of the studied area is the = presence of shallow artificial structures which affect groundwater flow = and=20 contaminant transport. The resulting heterogeneity of hydraulic = properties=20 suggested the choice of a geostatistical model. The response to = sea-level=20 fluctuations provided a broad coverage of the area of study and was used = as=20 calibration data, jointly with the response to two injection tests. The = three=20 data sets were analyzed simultaneously by means of a modification of the = pilot=20 points method, which allows accommodating complex heterogeneity patterns = and=20 seeks both model fit and plausible estimation. The resulting model = yields=20 excellent fit of not only head data, but also concentration data that = had not=20 been used during calibration.

Johansson M, Widing S, Leander B, Persson = KM
Groundwater=20 Model, Mike She, Of The Saltwater Distribution In Alnarpsstr=F6mmen, = South=20 Sweden

Groundwater model, MIKE SHE, of the saltwater distribution in=20 Alnarpsstr=F6mmen, south Sweden Mattis Johansson 1), Sven Widing2), Bo = Leander1)=20 and Kenneth M Persson1) 1) SWECO VIAK AB Box 286 201 22 MALM=D6 Sweden = 2) City of=20 Malm=F6 Malm=F6 Water and Wastewater works 205 80 MALM=D6 Sweden e-mail = addresses:=20 mattis.johansson@sweco.se; bo.leander@sweco.se; = kenneth.m.persson@sweco.se and=20 sven.widing@malmo.se The most important groundwater supply for the city = of=20 Malm=F6, south Sweden, is a well area called Grevie, situated in the = confined=20 aquifer of Alnarpsstr=F6mmen. The wells have been in operation for 106 = years=20 producing approximately 200 l/s drinking water mainly for the city of = Malm=F6.=20 Groundwater levels, geology and ground=ACwater chemistry have recently = been=20 investigated thoroughly, allowing the development of regional and local = models=20 in the software MIKE SHE. The model consists of three different models = built as=20 finite difference, FD, models. Each model has a number of quadratic = cells, with=20 3 different degrees of reso=AClution: 1200m, 400m and 200m. Results from = a coarse=20 model grid can be extracted into boundary conditions for the subsequent = finer=20 models. The number of cells in each model are 4323, 15675 respectively = 20601.=20 Besides the city of Malm=F6 there are a number of communities, = industries and=20 farmers using the same groundwater resource. The model aim has been to = create a=20 dynamic planning tool for all of these communities. Problems regarding = salt=20 water intrusion due to excessive groundwater discharge, water protection = areas,=20 groundwater regeneration areas and salting or refreshing water flow = transport=20 calculations have been illustrated and quantified. The work with the = model aims=20 also to develop useful tools when adopting the proposed groundwater = directive=20 COM(2003)550 to Swedish rules. The results are at present used for = identifying a=20 more correct influence area for the Grevie wells, and will also be used = for=20 calculating the maximum allowed production volume in the area.


Modeling to Elucidate Processes


Dagan G
Transverse Mixing At Fresh-Water = Salt-Water=20 Interfaces: An Unresolved Issue

Transverse dispersion is the main mechanism of mixing between = salt-water=20 beneath an interface and the flowing fresh-water above it. It is = responsible for=20 the existence of a mixing zone and the entrainment of fluid from the = salt water=20 body. The latter influences the sea outflows in coastal aquifers and the = salinization of wells pumping above an interface. Still, the values = adopted in=20 models of interface flow for transverse dispersivity are quite = arbitrary. A=20 review of the literature on the subject which focuses on the few, but = highly=20 relevant, field data is presented. The provisory conclusion is that = actual field=20 values of transverse dispersivity are smaller than usually assumed in = numerical=20 models. Theoretical and experimental approaches to further elucidate the = matter=20 are proposed.

Yechieli Y, Kafri U, Sivan O
The interrelation = between=20 the sea and the coastal aquifer, deduced from analyses of radioactive=20 isotopes

The rate of seawater intrusion is a major problem in management of = coastal=20 aquifers. This rate is usually monitored in observation and pumping = wells in=20 which the rise in salinity is interpretive as seawater intrusion. The = present=20 study used radioactive isotopes in order to get a direct estimate of = this rate=20 by dating both fresh and saline groundwater in the coastal aquifer of = Israel.=20 The radioactive isotopes were used also to determine the connection = among the=20 different sub-aquifers and between them and the sea. Groundwaters from = the=20 vicinity of the shoreline were analyzed for their C-14 and tritium = content,=20 together with their chemical and stable isotope composition. The results = indicate the following: 1) There are several distinct sub-aquifers in = the=20 coastal aquifer near the shoreline, differing in their heads, water = chemistry=20 and age. 2) The age of intruding seawater is expected to be younger in = the upper=20 sub-aquifer, due to the rise of sea level since the last glacial period. = Indeed,=20 the saline groundwaters in the lower sub-aquifers are older than ca = 10,000 years=20 (no tritium and C-14 of <12 PMC), while in the upper sub-aquifers = they are=20 younger than 50 years (contain tritium), indicating recent seawater = intrusion.=20 3) In most cases, groundwaters in the lower sub-aquifers were found to = be fresh=20 and old. This implies that the flow to the sea in these sub-aquifers is = blocked=20 or restricted. This old water can serve as an emergency reservoir since = it is=20 unlikely to be polluted. 4) In few cases, young fresh waters were found = in the=20 lower sub-aquifers, implying on faster flow to the sea or alternatively = through=20 the upper sub-aquifers. 5) Spatial mapping of the groundwater ages in = the=20 coastal aquifer can assist in calibration of hydrological = simulations.

Carey H, Li L, Werner A, Murphy S, Lockington=20 D
Influences Of Macro-Tidally Derived Watertable = Over-Height On=20 A Coastal Aquifer, Pioneer Valley Aquifer, Queensland, = Australia

The Pioneer Valley in Northern Queensland, Australia is host to one = of=20 Queensland's largest sugar producing regions. The Department of Natural=20 Resources and Mines (DNRM), under the auspices of the Queensland = government, has=20 undertaken numerical modelling of surface and groundwater systems to = assist in=20 resource management. The coastal periphery of the aquifer forms one of = the=20 largest numerical boundaries in the groundwater models (over 40 = kilometres in=20 extent). Current boundary conditions are fixed arbitrary hydraulic = heads,=20 elevated from Mean Sea Level (MSL). The models do not consider dynamic = or time=20 averaged tidal boundary conditions. Of significance is the influence of = a=20 semi-diurnal macro-tidal regime in the order of six metres range. = Therefore the=20 use of dynamic boundary conditions is required to appropriately simulate = the=20 near shore groundwater processes. Of interest to resource managers are = the=20 effects of non-linearity and beach slope which generate a varying = watertable=20 over-height across the coastal boundary (Nielsen 1990). This watertable=20 over-height represents the time averaged effects of tides on the = hydraulic head=20 at the coastal boundary which can influence the regional groundwater = flow. It=20 has been shown that the 1D Boussinesq solution (Nielsen 1990; Li et al. = 2000),=20 in a homogenous system, is capable of describing the sloping beach face = as a=20 highly non-linear filter with subsequent effects on the watertable. Due = to the=20 extents of the Pioneer Valley aquifer's coastal boundary, variations in = beach=20 morphology may affect the regional groundwater flow through variations = of=20 over-height along the coast. This paper presents the results of field=20 investigations as well as numerical simulations that aim to better = quantify the=20 coastal margin of the Pioneer Valley aquifer. This can provide greater = lucidity=20 to replicating near shore hydraulic processes, which can then be applied = to the=20 coastal boundary conditions of numerical modelling for regional = groundwater flow=20 in the Pioneer Valley Aquifer. Li, L., D. A. Barry, et al. (2000). = "Beach water=20 table fluctuations due to spring-neap tides: moving boundary effects." = Advances=20 in Water Resources 23: 817-824. Nielsen, P. (1990). "Tidal dynamics of = the=20 watertable in beaches." Water resources research 26: 2127-2134.

Rohit Goswami R, and Prabhakar T = Clement
Estimating The=20 Mixing Times Of Sinking Dense Plumes Discharged In Freshwater=20 Aquifers

A large volume of seawater was dumped into coastal freshwater systems = of Sri=20 Lanka by the 2004 tsunami event. The saltwater entered local unconfined = units by=20 infiltration through the unsaturated zone and also by direct discharge = into the=20 saturated zone through several open dug wells. This has contaminated = large=20 volumes of groundwater. A major management question of interest to local = water=20 agencies in this region is the amount of time required to naturally = flush out=20 the salt water from the aquifer system. We have completed multiple = laboratory=20 experiments to simulate the contamination scenario due to a tsunami = event, and=20 used the observed data along with numerical simulations to address this=20 management question. A 53 cm x 30 cm x 2.7 cm flow tank, packed with a = uniform=20 porous medium, was used to conduct these experiments. Saltwater (at sea = water=20 density of 1025 kg/L) was injected from the top of the tank to simulate = the=20 inundation event due to the tsunami wave. The experiments were conducted = with=20 and without freshwater flow; the datasets were used to quantitatively = analyze=20 the effects of ambient flow on stability of the plumes and their sinking = time.=20 Experiments were completed using two porous media with different = hydraulic=20 conductivity values. This helped us quantify the effects of media = conductivity=20 on sinking. During all these experiments, the sinking patterns of = convection=20 cells were studied and their effect on the transport was recorded. This = study=20 will present several sets of laboratory experiments. The experimental = results=20 will also be compared against numerical solutions obtained from a=20 two-dimensional variable-density code developed by our research = group.

Andersen MS, Christensen FD, Engesgaard P, Jakobsen R=20
Density Driven Seawater Plumes In A Shallow Aquifer = Caused By A=20 Flooding Event - Field Observations And Numerical Modeling

The flow and transport processes related to an unstable fluid density = distribution (i.e. dense seawater on top of less dense freshwater) have = been=20 studied extensively in the past by numerical modeling and by laboratory=20 experiments. However, there seems to be a disturbing lack of field data=20 describing this complex flow and transport process. Little is therefore = known=20 about the vulnerability of coastal freshwater aquifers subject to = seawater=20 flooding and how unstable fluid density distributions in coastal = freshwater=20 aquifers cause seawater contamination. This study presents spatial and = temporal=20 field data of the development of dense seawater plumes, following a = storm=20 flooding, in a shallow coastal freshwater aquifer. The development of = vertical=20 seawater plumes into the aquifer was monitored by pore water electrical=20 conductivity measurements in a 120 m transect of about 100 piezometers = and by=20 drive-point continuous vertical resistivity logs (el-logs). The = locations of the=20 onset of the seawater plumes appear to be controlled by topographical=20 depressions, locations where seawater ponds were observed after the = flooding.=20 The subsequent downward plume migration caused by the unstable density=20 distribution was found to be highly variable. This variability is = believed to be=20 caused by the geological heterogeneity, however, much of the variability = appears=20 to be on a small scale (~ cm), finer than the sampling scale of this = study. The=20 variable density code SUTRA was used for numerical modeling of the = seawater=20 plume development into the aquifer. The model largely captures the = overall=20 trends of plume development and migration velocity observed in the = field.=20 However, even though the measured medium-scale heterogeneity was = introduced in=20 the model, it did not adequately describe the complex details in the = seawater=20 distribution and the patterns of spreading, likely produced by = small-scale=20 heterogeneities. The results of this study (field and modeling) = highlight the=20 complexity of how an aquifer, subject to a seawater flooding event, is=20 contaminated by seawater. In turn the results gives insight in the = vulnerability=20 of coastal freshwater aquifers to catastrophic events such as the recent = Southeast Asian tsunami in 2004, the extensive flooding of New Orleans = in 2005=20 due to the hurricane Katrina and lastly the impacts of future sea-level = rise on=20 coastal aquifers.

Vandenbohede A, Lebbe L
Interaction of the tides = and=20 shore on the Belgian western coast

The Belgian coastal plain has a wide shore (300-450 width) with a low = angle=20 dip. It is covered by semi-diurnal tides. The difference between the = high and=20 low tide is at spring tide approximately 5 m and at neap tide 3 m. = Additionally,=20 it features a peculiar water quality distribution, which has been = subject of=20 some former SWIM contributions, with a salt water lens floating above = fresh=20 water. This dynamical setting is ideally suited to study the interaction = between=20 tides and the groundwater in a coastal environment with a sloping shore. = This is=20 done by the time series analyses of hydraulic heads observations made in = different observation wells and by integrating the observations in a = density=20 dependent groundwater flow model. Study area is the Nature Reserve = 'Westhoek',=20 situated in the western Belgian coastal plain along the French-Belgian = border.=20 Hydraulic head measurements in the dunes and on the shore are present. = Analyses=20 of these data show the propagation and attenuation of the tidal wave in = the=20 groundwater reservoir. Amplitude becomes smaller and there is lag = further from=20 the high water line. The tidal wave is not only attenuated laterally in = the dune=20 area but also vertically. The amplitude of the hydraulic head = fluctuation is=20 remarkably smaller for a shallow well than for a deeper well. Moreover, = during a=20 tidal cycle, fluctuation of the water table is negligible. This is due = to the=20 large storage capacity near the water table. A 2D density dependent = groundwater=20 flow model using MOCDENS3D was made to simulate the propagation of the = tides.=20 This was calibrated using the observations. In contrast with the = observations=20 which provide a discrete view, the model shows the propagation of the = tidal wave=20 in the complete groundwater reservoir. It illustrates the complex = interaction=20 between tidally oscillating sea level changes and its response in the=20 groundwater and the general groundwater flow from the dunes towards the = sea.=20 Shore topography is hereby for instance very important as it determines = the=20 initial tidal wave which propagates below the shore. Subject of some = debate of=20 the last SWIM in Cartagena was the question if the tides have some = influence on=20 the water quality distribution. The model shows that this is not the = case. The=20 long term boundary conditions such as the mean hydraulic gradient along = the top=20 of the shore determine this distribution and not the daily tides.

Schaars F, Bakker M, Kamps P
Three-dimensional = path=20 lines in variable density models with the SWI package

The objective of this presentation is to explain how the Amsterdam = Water=20 Supply used the Salt/Fresh interface movement during 1903-2004 to = validate a=20 recently calibrated groundwater model of the Amsterdam Waterworks Dunes = and to=20 demonstrate the impact of Salt/Fresh interface movement at future = predictions of=20 ground water table and capture zones. Density driven flow components = have been=20 modeled using the Salt Water intrusion Package (SWI). For 84 locations = the=20 computed changes of position of the Salt/Fresh interface in the period = 1903-2004=20 have been compared with positions inferred from chlorine measurements in = observation wells. The starting position of the interface for 1903 has = been=20 derived and computed from measurements made in 1925. The model can = reasonably=20 well simulate the average rise of the Salt/Fresh interface in the entire = model=20 area, except close to the sea.
As a follow up, various predictions = have been=20 made of 25- and 100 year capture zones of the water recovery system in = the AWD.=20 The results have been compared with approximate results inferred using = method=20 based on the assumption of a stationairy position of the salt fresh=20 interface.

Cruz A, Cardoso G, Da Silva Jr G
Spatial And = Temporal=20 Hydrochemical Behavior Of Piratininga Coastal Aquifer, Niter=F3i City,=20 Brazil

The city of Niter=F3i is one of the most economically and socially = developed=20 townships of Brazil. It is located in Rio de Janeiro State, in the = southeastern=20 portion of the country, and has a population of almost half a million = people,=20 according to the year 2000 demographic census. The study area comprises = the=20 Oceanic Area of Niter=F3i, in the sandbanks of Piratininga. It was, = until the mid=20 1980=B4s, an area of summer houses but nowadays it is mostly occupied by = permanent=20 residences. The area has been going through a fast demographic growth = and urban=20 expansion that produced a serious stress over groundwater resources, = especially=20 from 1980 to the year 2001. Groundwater was the only available source of = fresh=20 water up to 2002. From this year on, surface water distribution rapidly=20 substituted groundwater as the main supply in the area, and it was = possible to=20 evaluate the impacts of this change, since the area has been closely = monitored=20 since 1999. The local aquifer is a shallow sandy aquifer, with a medium = to=20 coarse grain size, free in hydrogeological character, formed by a = depositional=20 sequence of beach sandy deposits that area typical in Rio de Janeiro = State=20 eastern shoreline. It is a good aquifer, with a rapid circulation and = recharge=20 as shown in previous studies. Those properties, nevertheless, were = leading that=20 water body to a fast salinization and quality degradation due to human = impacts.=20 The main objective of this work is to show the results of the = hydrochemical=20 monitoring carried out to observe the saltwater/freshwater interface=20 accomplished from 1999 to the present, through some chemical indicators' = concentrations, main ionic ratios and the elaboration of geochemical = models of=20 saltwater intrusion and aquifer desalination subsequent to pumping = cease. Water=20 samples were analyzed for the main ions, both before and after year = 2002, and=20 compared with the result of the samples collected and analyzed in 2006. = It is=20 coincident with two different moments when excessive pumping caused = major=20 aquifer stress and approximately 4 years after pumping almost ceased to = exist.=20 Results were interpreted with the aid of the software PHREEQC (Parkhurst = and=20 Appelo, 2002) to assess plausible scenarios of the salt water wedge = behavior and=20 with the elaboration of graphs and diagrams for the hydrochemical=20 interpretation. After a few years of regime change, some interesting=20 hydrochemical modifications were observed as a result of aquifer = freshening,=20 particularly aquifer response to freshwater supply, as a result of = effluent=20 infiltration, since there is no sewage system.

Bouhlila R
Modeling Density Dependent Flow, = Transport=20 And Geochemical Processes In Porous Media

This work focuses on mathematical and numerical modeling of coupled = density=20 dependent flow and reactive transport in porous media. For the aim of = modeling,=20 three fundamental aspects have retained our attention: density dependent = flow=20 and transport of ions, geo-chemical reactions between salts and brine = and=20 interaction between these two processes and its effect on = hydro-dynamical=20 properties in porous media. The formulation of coupled flow and = transport in=20 porous media leads to nonlinear and strongly coupled equations. So as to = solve=20 them, we have developed a finite element procedure with a specific = method of=20 balancing gravity terms to calculate Darcy's velocities and to correctly = account=20 for the density current. The second aspect of this work focuses on the = salts and=20 brine chemical phenomena. For such concentrated solutions, the specific = ionic=20 interaction model of Pitzer allows to calculate ions and solvent = activities as=20 well as the density of the solution. Dissolution and precipitation = reactions of=20 evaporitical salts are controlled by diffusion and are thereby = represented by a=20 first order kinetic law. The geo-chemical model that we have developed=20 integrates these concepts and allows calculation of the quantities of = the=20 different salts that may precipitate or dissolve in a solution when its=20 equilibrium is displaced by evaporation or when it mixes with other = waters. For=20 the validation of this model, we have simulated the evaporation of a = brine from=20 Sebkhat El Adhibate located along the south coast of Tunisia and we have = compared the calculated concentrations, densities and salt quantities = with those=20 measured. In the third part of this work, we have integrated the = geochemical=20 module in the flow and transport module after having extended the latter = to=20 several species in solution. Thus, the realized coupled model allows us = to=20 simulate flow, transport of ions and dissolution-precipitation reactions = of=20 salts in porous media. As application, this model is used to quantify = salt=20 deposition in a coastal lagoon when seawater evaporates and the = evolution of the=20 media until the stage of Sebkha in the marine domain. The case of = Sebkhat El=20 Melah of Zarzis in Tunisia is used as basis for the geometrical = configuration=20 and for time scales. The procedure of validation has focused on boundary = conditions in terms of evaporation-induced flow and on kinetic = coefficients of=20 dissolution - precipitation reactions of salts. Simulated sequences of = halite=20 and gypsum layers as well as the filling process duration of the lagoon = are in=20 accordance with observations and studies made on the site of Sebkhat El = Melah=20 since the beginning of 80s.


Human Impacts Causing Seawater Intrusion


Yasumoto J, Ohtoshi K, Fujiwara T
Influence Of = Tidal=20 River Improvement Works On The Behaviors Of Salt Water Intrusion In A = Coastal=20 Unconfined Aquifer

The phenomenon of salt water intrusion in a coastal unconfined = aquifer=20 maintains a dynamic balance under the influences of the sea level and = water=20 table variations, geological properties of the aquifer, and the tidal = river=20 existing there. Consequently it is easy to understand that the behaviors = of salt=20 water bodies in such a situation are quite complicated. Tidal river = improvement=20 works, moreover, may have the capability to shift the groundwater = environment to=20 another new balanced condition. The field where present study dealt with = locates=20 near the coast line, and has experienced the tidal river improvement = works. The=20 authors have been conducting successive field surveys of salt water = intrusion=20 from before the river improvement works have started. Each survey is = composed of=20 the three kinds of measurement; 1) water table and vertical distribution = of the=20 electrical conductivity (EC) of groundwater at many test wells, 2) water = surface=20 and sea water intrusion in the tidal river, and 3) sea level variation. = The data=20 of rainfalls are obtained by the rain gauge set up in the field. = Analysis and=20 comparison of the data obtained before/after the tidal river improvement = works=20 led the following confirmations and findings. Interface between the = fresh and=20 salt water bodies in the aquifer consists of a mixing zone. Both = elevations of=20 the water table and the mixing zone vary corresponding to the tide. = Those=20 variations have a stronger connection with the adjacent tidal river than = the=20 sea. The elevation of the mixing zone varies in phase with the water = table at=20 some wells, however, out of phase at other some wells. Although such = difference=20 seems to be brought about by the geological difference of the site, the = details=20 have to be verified in the future. The influence of tidal river = improvement=20 works on the salt water intrusion was estimated quantitatively through = the=20 criterion that was obtained by the integration of vertical distribution = of EC=20 from the water table in each test well. On the basis of the criterion, = it was=20 made clear that tidal river improvement works are causing serious = influences on=20 the salt water intrusion through lifting the mixing zone upward.

Essink GO, De Louw P
Salt Water Intrusion Of The = Northern Coastal Area Of The Netherlands Due To Anthropogenic Land = Subsidence:=20 Analysis Of Compensating Measures

At the northern coastal area of the Netherlands (Northwest Friesland) = salt is=20 exploitated at a depth of 2000 meters causing a land subsidence up to 40 = centimeters. To compensate the relative rise of the groundwater table, = the=20 surface water level is lowered by the waterboard, equal to this land = subsidence.=20 This will induce a salt water intrusion towards the shallow groundwater = and=20 surface water system. Salinisation of the root zone and surface water = will=20 jeopardize agricultural activities in the area. Surface water may not be = suitable for irrigation anymore. Salt damage to crops occur when salt=20 groundwater reaches the root zone. The waterboard has thus decided to = make a=20 sustainable water management plan to reduce the salinisation of the = shallow=20 water system. Hydrological effects of the plan are analysed on a = regional and a=20 local scale. For both scales the code MOCDENS3D (Oude Essink, 1999) is = used to=20 simulate density dependent groundwater flow and coupled salt transport. = On the=20 regional scale, the effects of surface water level lowering, sea level = rise and=20 land subsidence are assessed on the salinisation of the water system. On = the=20 local scale, dynamic freshwater lenses floating upon saline groundwater = are=20 investigated though field observations and modelling. Historic recharge = and=20 evapotranspiration rates over 10 years are used to assess the thickness = of the=20 freshwater lenses throughout the season. When the thickness of the lens = is=20 small, salt damage to crops can easily occur. Measures like heightening = the=20 drain level and decreasing the distance between water channels are = studied to=20 compensate salinisation of the root zone. The analysis of the water = system helps=20 the waterboard to design a sustainable water management plan of this = coastal=20 area.

Venturini L, Esca S
Salt Water Intrusion Of The = Northern=20 Coastal Area Of The Netherlands Due To Anthropogenic Land Subsidence: = Analysis=20 Of Compensating Measures

The sample area is located in Cervia (Province of Ravenna - Italy;), = nearby=20 the coast. In the last few years the construction of basements, that = involve the=20 ground water table drainage (dewatering) by the use of the wellpoint = techniques,=20 has become more and more common. Particularly, all the new buildings = comprise=20 basement used as parking areas, cellars and storage areas for = technological=20 equipment. These constructions, nowadays, are made without any = hydrogeological=20 inspections and no limitations or survey are regulated by municipalities = for=20 assessing possible effects and risks. It has been possible, indeed, = notice that=20 the digging techniques based on groundwater pumping may produce a = modification=20 and an increment of the groundwater salinity, due to the water flow from = the sea=20 (salt water intrusion) and from the bottom of the fresh waters upconing. = Obviously, the salinity increment may compromise the quality and = quantity of the=20 water resources and cause serious effects on the actual vegetation. For=20 assessing the risk a hydrogeological survey on a sample area has been = set up in=20 order to: =B7 Verify the effects of the intervention both in water = extraction=20 stage and in abandonment stage. In particular, it is important to = determine the=20 recovery time for both the head and the water salinity. =B7 Determine = alternative=20 solutions for reducing the environmental impact. =B7 Define a technical=20 prescriptive plan for the release of the intervention authorizations. = Besides=20 the geognostic and hydrogeological analysis, the survey plan also = involves the=20 use of a mathematical 3-D model based SEAWAT that uses the = finite-difference=20 approximation for the variable-density flow equation., in order to = provide a=20 useful predictive tool to verify the proposed interventions effects.

Lima Montenegro SMG, De Assun=E7=E3o Montenegro AA, Da=20 Silva
Intensive Exploitation And Groundwater Salinity In = Recife=20 Coastal Plain: Monitoring And Management Perspectives

Recife, the capital city of Pernambuco State, is located in the = Northeast=20 coast of Brazil. Even though the surface water is the main source for = supply in=20 the region, several constraints have been imposed to the supply system = due the=20 increasing demand, limited resources in terms of quantity and quality, = and=20 frequent droughts. Groundwater use in the area has been growing for the = past 20=20 years, with an increasing number of deep and shallow wells, supplying = hotels,=20 industries and residential buildings. Recife coastal plain has an area = of 112=20 Km2 and a population around 1.5 million inhabitants, being highly = urbanized. The=20 over-exploitation of groundwater and difficulties in recharging the = aquifers has=20 severely depleted the potentiometric levels for the past 20 years. In = addition,=20 the coastal aquifers in the area increase their vulnerability to sea = water=20 intrusion as a consequence of the over-exploitation. Many wells have = been=20 abandoned due to the high salt content in groundwater. One of the most = critical=20 areas identified is in Boa Viagem beach, a residential and tourist area = with=20 high population density, concentrating a large number of private wells. = In part=20 of Boa Viagem Beach, denominated "Zone A", drawdown in piezometric = levels of=20 more than 40m have been observed in some wells. A monitoring program has = been=20 pursued to assess groundwater salinity in Recife coastal plain, = including the=20 so- called "Zone A". This paper presents the results of the monitoring = program=20 and analyses the causes for the high salinity levels in some points. = Electrical=20 conductivity and selected ions were analyzed and ion ratios were = calculated in=20 order to investigate time and spatial changes. Selected cases are = presented.=20 Results reveal areas where the salinity is high, although a unique = pattern for=20 time variation has not been identified. Analyzing also rainfall data, = the=20 results reveal the effect of natural recharge on groundwater salinity in = some=20 places. Present practices and perspectives of management groundwater = quantity=20 and quality are also discussed. This study has joined the International=20 Geoscience Programme (IGCP) Project No. 519 "Hydrogeology and = hydrochemistry in=20 coastal aquifers on the Atlantic coast of South America". The project = aims=20 developing joint methodologies on marine intrusion process analysis in = coastal=20 aquifers on the Atlantic coast of South America, by assembling existing=20 information and the participating research teams' potential.


Modeling: Techniques


Diersch HJ
Modeling Variable-Density, = Multi-Diffusive,=20 And Multi-Species Convection In Porous Media

Density-driven convection processes in porous media are of growing = concern in=20 relation to solute transport and geothermal problems. There is both a=20 theoretical and practical need in modeling variable-density flow, = multi-species=20 mass and heat (thermohaline) transport phenomena with multiple buoyancy, = multi-diffusive and viscosity effects. Such types of convection are much = different from those that develop in stable advective, dispersive and = diffusive=20 processes, and can significantly increase mass transfer rates at mixing = zones=20 separated by sharp contrasts in fluid density. The paper presents recent = developments and simulations of highly complex multi-diffusive fingering = convection processes by using the finite- element simulator FEFLOW. New = powerful=20 features of the simulator are presented. It covers extensions to = multi-species=20 reactive transport equations, species and temperature related multiple = density=20 expansion parameters and multiple fluid viscosity relations. Modeling = results=20 are compared to recent Hele-Shaw experimental findings and other = numerical=20 studies. Different aspects are emphasized: (1) Basic formulations for=20 multi-species, multi-diffusion, and multi-dimensional convection in = porous media=20 encompassing Boussinesq and extended Boussinesq approaches, (2) Buoyant=20 instability and role of perturbation at high Rayleigh numbers, (3) = Pattern=20 formation for three-species double-diffusive realizations, (4) Mesh = resolution=20 effects, and (5) Computational accelerations. The features essential to = model=20 successfully the processes in practical applications are addressed, = especially,=20 adaptive time-stepping control with a powerful sequential iteration = approach,=20 parallel computation at refined meshes, and the application of an = algebraic=20 multigrid solver.

Motz LH, Sedighi A
Approximating The Effects Of = The=20 Saltwater-Freshwater Interface In A Three-Dimensional Groundwater Flow=20 Model

Numerical experiments were performed to investigate how the=20 saltwater-freshwater interface could be approximated in a = three-dimensional=20 groundwater flow model to yield accurate values for hydraulic heads and = fluxes=20 in the freshwater part of a coastal aquifer. These experiments consisted = of=20 obtaining solutions for a three-dimensional model that represented a = coastal=20 aquifer using the groundwater flow code MODFLOW and comparing the = results to a=20 solution for equivalent freshwater heads using the variable-density flow = and=20 transport code SEAWAT, which was considered to be the accurate solution = to the=20 problem. The seacoast was simulated by specifying a concentration = boundary=20 condition with a total dissolved solids (TDS) concentration equal to the = TDS of=20 seawater, and simulations were run for both specified-flux and = specified-head=20 boundary conditions at the upstream freshwater boundary. The MODFLOW = solutions=20 consisted of (1) specifying the head at the coastal boundary equal to = the=20 seawater potential (hsw =3D 0); (2) specifying the head at the coastal = boundary=20 equal to the equivalent freshwater head (hfw); (3) using inactive cells = to=20 represent the saltwater-freshwater interface; (4) reducing the = horizontal=20 hydraulic conductivity in model cells to account for reduced freshwater=20 thickness in the part of the aquifer in which saltwater intruded beneath = the=20 interface; and (5) designating general-head boundary cells along the = location of=20 the saltwater-freshwater interface to represent a head-dependent flux = across the=20 saltwater-freshwater interface. The results of the numerical experiments = for the=20 specified-flux upstream boundary condition for the three-dimensional = model=20 indicate that the MODFLOW solution that best matches the SEAWAT solution = in=20 terms of the calculated head at the upstream specified-flux boundary is = the=20 solution in which the head at the coastal boundary was specified equal = to the=20 equivalent freshwater head (hfw) over the full thickness of the aquifer = at the=20 seacoast. Similarly, the results of the numerical experiments for the=20 specified-head boundary condition for the three-dimensional model = indicate that=20 the MODFLOW solution that best matches the SEAWAT solution in terms of = the=20 calculated flux at the upstream specified-head boundary also is the = solution in=20 which the head at the coastal boundary was specified equal to the = equivalent=20 freshwater head (hfw) over the full thickness of the aquifer at the=20 seacoast.

Bakker M
How Far Does A Seawater Intrusion Model = Need To=20 Be Extended Below The Sea Bottom?

Two common questions for seawater intrusion modelers are: "How far do = I need=20 to extend my numerical model below the sea bottom for accurate = simulations?" and=20 "What boundary condition to I apply along this boundary?". In this = presentation,=20 we will provide practical guidelines to estimate this distance based on = recently=20 published analytic solutions for steady interface flow in aquifers = consisting of=20 a confined and a semi-confined section. The length of the outflow zone = along the=20 sea bottom is a function of only two dimensionless parameters. The first = parameter is the product of the head gradient towards the sea and the=20 dimensionless leakage factor divided by the dimensionless density = difference;=20 the leakage factor is the square root of the transmissivity multiplied = by the=20 vertical resistance of the leaky layer at the bottom of the sea. The = second=20 dimensionless parameter is the length of the semi-confined section of = the=20 aquifer divided by the leakage factor. These two dimensionless = parameters are=20 easily estimated for any numerical seawater intrusion model, as they are = needed=20 in the input files. If the sea bottom extends farther than the required = length=20 of the model, it is not important what boundary condition is specified: = it does=20 not effect the model results whether a constant-head or no-flow boundary = is=20 used. If the sea bottom doesn't extend far enough, but cuts through the=20 semi-confining layer on top of the aquifer, a specified-head boundary = condition=20 needs to be specified along this line. As examples, the presented rule = is=20 applied to the coast of the State of Georgia (USA), and to the coast of = The=20 Netherlands near the dune area managed by the Amsterdam Water Supply. = Topic:=20 Coastal aquifer system hydrodynamics

Rao SVN, Sreenivasulu V, Bhallamudi SM
Planning=20 Groundwater Development In Coastal Aquifers

Planning groundwater development is essential in coastal regions = where the=20 fresh water supply from surface sources is not adequate. However, = excessive=20 groundwater extraction often leads to seawater intrusion into the = aquifer, and=20 hence excessive salinity. Therefore, groundwater development in coastal = aquifers=20 must involve management strategies such that the demand is met in terms = of both=20 quality and quantity. Groundwater management models for coastal aquifers = should=20 combine an accurate process model for seawater intrusion with an = appropriate=20 technique for solving the optimization problem. In this study, a=20 simulation-optimization (S/O) model is developed as a tool to determine = the=20 optimal operation strategy wherein the groundwater extraction is = maximized,=20 while the seawater intrusion is minimized through a series of barrier = wells. The=20 S/O approach is appealing because it can readily use existing simulation = models=20 and can account for the complex behavior of a groundwater flow system in = a=20 coastal aquifer. The multi-objective management problem is cast as a = nonlinear,=20 non-convex combinatorial model and is solved using a coupled=20 simulation-optimization approach. A density dependent groundwater flow = and=20 transport model, SEAWAT is used for simulating the dynamics of seawater=20 intrusion. The Simulated Annealing algorithm is used for solving the=20 optimization problem. The idea of replacing the SEAWAT model with a = trained=20 Artificial Neural Network (ANN) to manage computational burden within = practical=20 timeframes on a desktop computer is explored. The utility of the study = is=20 demonstrated through a tradeoff curve to prioritize groundwater = development,=20 while controlling seawater intrusion at desired levels.

Soto Meca A, Alhama L=F3pez F, Gonz=E1lez Fern=E1ndez=20 C
Transient Simulation Of A Real 2-D Aquifer By The = Network=20 Method

The network simulation method, which has proved its efficacy and = accuracy in=20 nonlineal and moving boundary problems in heat transfer and other = engineering=20 fields, is applied here to numerically solve the transient position of = the=20 saltwater front in a 2-D real aquifer (Biscayne aquifer in Florida). = Data of=20 this aquifer are taken from the bibliography. The set of coupled partial = differential equations for pressure and salt concentration variables are = based=20 on the stream function formulation, which presents significant = advantages for=20 use in numerical simulations involving very small hydraulic gradients = because=20 solutions of the flow fields using this formulation ensures the = conservation of=20 fluid mass. In addition, velocities are easily calculated. Governing = equations=20 are spatially discretized to design the network model of the volume = element,=20 which, in turn, is connected to other similar elements and to the = network=20 devices that simulate the boundary conditions. The applied method goes = beyond=20 the scope of the classical analogy, which always refers to lineal = equations and=20 has been applied in this field to 1-D problems. The network model for = this=20 application, which is briefly described, uses a device that is capable = of=20 implementing any kind of nonlineal addends on the governing equations = (including=20 the boundary condition equations), and provides a fast and precise = solution with=20 negligible computing times and with a relatively small number of volume=20 elements. The influence of the two main dimensionless parameters in the=20 solution, the discharge parameter and the Peclet number, on the = stability of the=20 solution is studied. Computed transient streamlines and isochlor = contours are=20 presented and compared with those of other authors. Also, locations of = the toes=20 of saltwater recirculation, under various values of the Peclet number = and a=20 specified discharge parameter, are shown.

Park N, Hong SH, Shi L, Seo KS, Cui L
Laboratory = Experimental Validation Of Sharp-Interface Saltwater-Intrusion-Control=20 Optimization Model

Between intruding seawater and ambient fresh groundwater there exists = a=20 transition zone of finite thickness in which solute concentration varies = continuously. The thickness varies depending on a number of factors; the = dispersivity and the pore-water velocity are the most significant. The = most=20 rigorous modeling approach for the seawater intrusion phenomena is the=20 density-dependent flow and transport technique. However, the flow and = solute=20 transport approach requires a high-resolution spatial discretization so = that the=20 number of unknowns can reach millions easily. Additionally, iterations = needed to=20 solve the nonlinear governing equations make computational demand = prohibitive=20 even for a single forward simulation. Use of the flow and transport = model in=20 embedded simulation-optimization, that requires numerous solutions of = the=20 simulation model, for most practical problems is not feasible even with = advanced=20 computers. The sharp-interface assumption neglects the transition zone. = However,=20 it allows much faster simulation results, therefore, it may be the only=20 practical technique amenable to simulation-optimization approach. In = this study=20 the applicability of a sharp-interface optimization model for = controlling=20 seawater intrusion to protect freshwater pumping wells are investigated = using=20 observation results from two laboratory sand tanks. Freshwater injection = and=20 saltwater pumping have been used to reduce seawater intrusion and to = protect=20 freshwater pumping wells. Two aspects of the numerical results will be = compared=20 with experimental results. First, the shape of the saltwater-freshwater=20 interface before and after control measures will be compared. The = interface is=20 visualized using dyed saltwater. Photographs of the views through the = side glass=20 of the sand tanks are analyzed to identify the transition zone that will = be=20 compared with the sharp interface. Image analyses using commonly = available=20 software allow high-resolution delineation of the transition zone. = Secondly,=20 composition of pumped water will be compared. Although the sharp = interface model=20 cannot simulate water quality directly, mixing ratios of saltwater and=20 freshwater at pumping wells can be computed with a simple algorithm.=20 Applicability of the sharp-interface optimization model will be = demonstrated=20 along with efficiencies of freshwater injection and saltwater = pumping.

Kuznetsov M, Yakirevich A, Sorek S
Extraction=20 Simulations Of Fresh Groundwater Artificial Lenses

Clayey watersheds are utilized in desert areas to collect runoff = water during=20 seasonal precipitation and infiltrates through a pond to the underground = to be=20 stored on top of the saline water table. Thus, an artificial lens of = fresh=20 groundwater (ALFGW) is created for future water supply. We simulated = numerically=20 different scenarios of the ALFGW pumping to assess its sustainable = exploitation.=20 Usually, pumping is modeled by introducing sinks with prescribed rates = at=20 specific nodal locations. However, the actual mixing of water in the = well during=20 pumping and the effect of seepage face are not accounted for. To improve = simulations, we developed a sub-model of pumping from a well of = prescribed=20 geometry and coupled this with the FEFLOW 5.1 code. First, we simulated = an=20 axi-symmetric case for a pumping well located at the center of the ALFGW = domain.=20 Two pumping schemes were considered: 1) a skimming well with a screen = initially=20 at the freshwater zone; 2) one well screened in the freshwater zone = while the=20 other well screened in the saltwater zone (i.e. a scavenger wells = system). The=20 ALFGW pumping scenarios varied in their pumping rates, well screen = length and=20 location, pumping cycle periods and the distance between screens of the=20 freshwater and saltwater wells. Simulations indicated that pumping from = a=20 shallow well produced better water quality in comparison to that of a = deeper=20 well. However, the former case limits the rate of production by lowering = the=20 water level in the well to the extent of full depletion. Using scavenger = wells,=20 which are screened in both the fresh and saline water zones, = considerably=20 decreases the up-coning effect and the risk of salinization of the = freshwater=20 zone. Decreasing the distance between screens of freshwater and = saltwater wells=20 results in a decrease of water salinity pumped from the freshwater well. = However, a significant volume of freshwater can be pumped by the = saltwater well.=20 Pumping from a well at the infiltration pond center, where its thickness = is=20 maximal, results with an efficient stored freshwater utilization. = However, often=20 some pumping wells are constructed at the pond border, positioned = downstream to=20 ambient groundwater flow. To check the effect of well positioning = relative to=20 the infiltration pond and well type (skimming or Ranney), we conducted = pumping=20 simulations concerning 3-D configuration. The most efficient pumping was = obtained for a Ranney=AE Collector Well. We considered lateral well = screens=20 installed 1 m below the water table. Since these well screens are = positioned=20 horizontally, longer screen lengths (in comparison with skimming wells) = can be=20 installed reducing the velocity of the water entering the screen slots = and=20 maximizing well efficiency. The up-coning saltwater was minimal because = of lower=20 specific discharge per unit area.

Cau P, Manca S
The Datacrossing Dss: A Data-Grid = Web=20 Based Approach To Groundwater Modeling

The complexity of groundwater resources management in coastal regions = presents an increasing challenge to policy makers. A multidisciplinary = approach=20 is needed to collect, use and analyse large amounts of heterogeneous = data, apply=20 environmental models and to design management strategies. The purpose of = this=20 study is to develop a web-based, distributed, user-friendly Decision = Support=20 System, to analyse coastal groundwater systems: Datacrossing DSS is a = basin=20 scale groundwater model conceived to support decision making in the = field of=20 sustainable water resources management. It is accessible through a Web = interface=20 (http://datacrossing.crs4.it) that relies on a distributed experimental=20 Data-GRID framework. An application, based on a groundwater code and = pre/post=20 processing tools was developed, to model, analyse and visualize the = seawater=20 intrusion dynamics. Such module provides a framework to predict the = impact of=20 management and policy options on the dynamic balance between freshwater = and=20 saltwater. Digital datasets are stored in geographically distributed = resources=20 and made available via a Data-GRID environment. This provides = participating=20 institutions with complete control on the selection of data they wish to = assess.=20 The code is the CODESA-3D model, a three-dimensional finite element code = of=20 coupled density-dependent and variably saturated flow and transport. The = DSS has=20 been tested to the multiple layer aquifer of Portoscuso, located on the=20 South-West part of Sardinia, Italy, threatened by sea water intrusion = and=20 inorganic residuals from the local industrial activities. A significant=20 deterioration of groundwater quality due to seawater encroachment has = been=20 observed in the wells located on the cost line. Moreover field data = indicate=20 that contamination is present in both the phreatic and the confined = units.This=20 paper describes the approach and the technologies adopted to design = Datacrossing=20 DSS and its application to the study of the Portoscuso case. It also = illustrates=20 the original solutions provided by Datacrossing DSS for an advanced=20 collaborative approach based on enabling grid technologies.


Intrusion in Karst Aquifers


Tulipano L, Fidelibus D
Markers Of Seawater = Intrusion=20 Hazard In Coastal Karstic Aquifers

The design and running of a monitoring network is of primary = importance in=20 coastal aquifers on the light of the application of the Water Directive = 2000/60=20 of European Union. The Directive does not precisely identify coastal = karstic=20 aquifers, in spite of their importance. Moreover, the criteria (Annex = V),=20 defined for monitoring and assessment of groundwater = qualitative/quantitative=20 status, are unsuitable for the coastal aquifers in general, thus needing = careful=20 implementation. Actually, the particularity of coastal (karstic) = aquifers makes=20 obvious that exploitation may trigger seawater intrusion, resulting in=20 groundwater salinization and consequent deterioration of qualitative = groundwater=20 status: coastal karstic aquifers are even more vulnerable due to the = presence of=20 karstic conduits accelerating the seawater intrusion. Related phenomena = are=20 quite complex to identify, check and manage: it is not an help that the = list of=20 prior polluting substances (Decision n. 2455/2001/CE) does not consider = the=20 salts introduced to fresh groundwater due to seawater intrusion. The = paper=20 develops a few principles for coastal aquifer monitoring, showing as an = example=20 the potentiality of measures carried out in the observation well net of = the=20 Salento Peninsula (Southern Italy). Previous studies demonstrated the = role of=20 temperature-salinity (T-S) logs made in observation-wells (completely = screened=20 and reaching salt waters beneath transition zone) in the control and = monitoring=20 of salinization. Logs, apart the ease in reconstructing spatial = distribution of=20 groundwater salt content and temperature, allow the calculation of a few = parameters useful for understanding the salinization mechanisms and = quantifying=20 the fresh/salt water disequilibrium. Among them is the "real groundwater = hydraulic head" (ts), i.e. the hydraulic head of variable density = groundwater,=20 calculated from salinity logs: if ts does not prevail on sea level, = seawater=20 intrusion is expected to occur. Thus, a map of ts values, updated = according to=20 monitoring, which should provide during the hydrological year the needed = T-S=20 profiles, represents a method for controlling the effects of = exploitation.=20 Unlikely, it needs of a critical number of observation-wells to cover = with real=20 measures an area: anyway, even though only a few observation-wells are=20 available, we can still obtain ts maps by using 2D salinity = reconstructions at=20 different depths and on vertical sections based on T-S logs related to a = net of=20 normal wells. The procedure, applied to a zone of the Salentine = Peninsula, gives=20 a picture of the extent of the decrease of "real hydraulic head" of = groundwater,=20 which matches very well with the salinization status.

Milanovic P
Problems Of Sea Water Intrusion = Between Boka=20 Kotorska Bay And Delta Of Neretva River - South Adriatic = Coast

The salinization of coastal karst aquifers has been detected along = the shore=20 of North-eastern Adriatic coast between Boka Kotorska bay and delta of = Neretva=20 River. An intrusion of sea water deep into the land and salinization of = the=20 aquifer's in this area is direct consequence of geological composition = of the=20 sea shore area. A specific hydrogeological role within this part of = Dinaric=20 karst is provided by flysch sediments. This rock usually acts as perfect = hydrogeological barriers. However, at many localities of this part of = coast the=20 flysch is absent, or occurs at very shallow depth, sometimes is very = thin, or it=20 has been subjected to considerable tectonic actions. Under that = conditions=20 intrusion of sea water into the aquifer is common. Sometimes = salinization of=20 aquifers can be achieved through karst channels which end at the sea = bottom far=20 away from the coast. All karst springs that have discharging outlets in = direct=20 contact with sea or one meter above are subject to the influence of = tides. In=20 that cases the high tide effect transfers directly to the karst channel = used for=20 discharge of karst aquifer. Particular problem appears in the case of = deep=20 siphonal springs at the sea coast level. In article are presented = examples of=20 different springs at sea coast including remedial works at some of them = to=20 prevent sea water intrusion into the tapping structure: - Salt water = intrusion=20 into the deep siphonal springs in Boka Kotorska bay, Orahovacka ljuta, = Spila=20 Risanska, Skurda, Gurdic and Sopot including water supply problems; - = Spring=20 Robinson (Duboka Ljuta) between Cavtat and Dubrovnik, at sea level, with = large=20 karst channel behind, in the Triassic dolomite; - Deep siphonal spring = Ombla=20 protected against tide influence by small dam; - Spring "Palata" in = Small Zaton=20 tapped by wells and protected against sea water intrusion and tide = influence by=20 shallow concrete cut-off wall; - Submarine springs along the coast = between Slano=20 and Ston and problem related to the oyster farm; - Small springs along = the=20 perimeter of delta of Neretva River and problems appear during the high = tide=20 period.

Polemio M, Dragone V, Limoni P.P
Salt = Contamination In=20 Apulian Aquifer: Spatial And Time Trend

The quality of groundwater of Apulian carbonate aquifers is severely = affected=20 by salt contamination due to seawater intrusion. Due the scarcity of = surface=20 water resources, the characterisations of quality degradation risks of=20 groundwater and of its spatial and temporal trend are particularly = important in=20 the region. To pursue these results considering the risk of salt = contamination=20 due to seawater intrusion, a simple salinity threshold approach, based = on the=20 determination of a single value dividing fresh groundwater from seawater = contaminated groundwater, is proposed for Apulian groundwater. The = analysis=20 shows this threshold I is equal to 0.5 g/l. The spatial trend of 0.5 g/l = salinity contour line in the period 1981-2003 is characterised. Along = the areas=20 close to the Adriatic and Ionian shoreline groundwater saline = contamination is=20 resulted to be a long-standing phenomenon. Only the Murgia interior and = a=20 restricted strip in the middle of the Salentine Peninsula have not been=20 contaminated so far. The salt contamination is also characterised = considering 17=20 time series of monthly chlorine concentration, a parameter which can = highlight=20 the seawater contamination effects. Data from 1968 to 2001 are = considered and=20 compared with rainfall and temperature time series. The increased saline = contamination is closely related to droughty years and to the increasing = discharge by wells. Before 1980, no significant concentration increase = was=20 reported in the majority of wells. The phenomenon became apparent in the = late=20 80s after some dry years that result in a reduced recharge of aquifers = and=20 increased groundwater withdrawals. It is confirmed the existence of = areas=20 considerable protected from the seawater intrusion, of areas exhibited = in=20 serious manner to the salt pollution and, finally, of an immense portion = of=20 territory in which the quality of the groundwater depends exclusively = from our=20 capacity to manage the water resources.

Arfib B, Cavalera T, Gilli E
Reach The Hydraulic = Functioning Of A Coastal Karstic Aquifer With A Conduit-Matrix=20 Model

Coastal karstic aquifers are subject to saline intrusion by two ways: = by the=20 saltwater intruded wedge as usually observed in porous media, and by=20 preferential flow in conduits characteristic of the karst systems. A=20 conduit-matrix model has been proposed recently to access the hydraulic=20 functioning of the aquifer, using the observation and data (water level, = conductivity, discharge) recorded at a brackish coastal karst spring. = This new=20 model, called SWIKAC (SaltWater Intrusion in KArst Conduits), based on a = conceptual model of diffuse saltwater intrusion in the karst matrix and = exchange=20 with a main conduit discharging at the coastal spring, was first = developed and=20 validated using a case study: the Almyros of Heraklio in Crete. We = proposed in=20 this presentation to apply the SWIKAC model to a new case study: the = PortMiou=20 submarine karstic spring (France). This application will meet two goals: = a new=20 insight in a coastal karst aquifer by measurements at the outlet, and a = new=20 validation for the use of the conduit-matrix model in coastal area. The = expected=20 results are of outmost importance for the management of coastal = freshwater=20 resources. This kind of model gives clue to the depth and the location = of the=20 saline intrusion zone into the karst conduit. It's a useful tool to = propose=20 managing plan in accordance with the hydraulic functioning of the=20 aquifer.


Intrusion in Sedimentary Aquifers


Bocanegra EM, Massone HE, Cionchi JL, Mart=EDnez=20 DE
Integrated Management Of The Coastal Aquifer In Mar = Del=20 Plata, Argentina

Mar del Plata, located on the Atlantic coast, is the main tourist = centre in=20 the country and has a population of 600,000 inhabitants increasing = threefold=20 during the summer. Water for urban, agricultural and industrial uses are = exclusively supplied by groundwater resources. The main geoenvironmental = problems are: uncontrolled urban expansion, saline intrusion, pollution = of=20 groundwater, an inadequate waste management and recurrent floods in the = urban=20 and periurban areas. The Municipal Company dedicated to provide = freshwater,=20 sewage and urban storm drainage services adopted action axis for the = development=20 which took into consideration the sanitation social dimension, the = natural=20 resources conservation, the infrastructure as productive support and the = quality=20 of coastal front as local tourist resource. In order to define the=20 temporo-spatial evolution of coastal environmental processes some = geoindicators=20 addressed to decision-makers were designed to assess the environmental = pressure=20 caused by human activity, the aquifer conditions or state and the = anthropic=20 response to correct undesirable situations. For pressure the = geoindicators were:=20 annual volume exploited by underground basin, total population lacking = fresh=20 water and sanitary services, polluting industries and farms under = intensive=20 exploitation, area affected by industrial and urban waste disposal = sites, annual=20 volume of urban waste produced, among others. The geoindicators related = with=20 state were annual aquifer recharge, unsaturated thickness, chloride=20 concentration in groundwater, water table level, piezometric head of the = coastal=20 hydraulic barrier, number of exploitation wells in the coastal hydraulic = barrier=20 and in the interface zone, nitrate pollution in water courses and = groundwater,=20 bacteriological pollution, heavy metals in water and sediment and for = response,=20 the indicators were: number of exploitation and abandoned wells, persons = affected by hydric diseases treated in hospitals and area affected by = industrial=20 and urban waste disposal sites, annual public expenditure for = consumption=20 reduction, public expenditure for water supply and sewage treatment, = enforcement=20 of environmental regulations, annual expenditure for urban (and = industrial)=20 waste disposal, administrative and jurisdictional organisation, = department=20 budget, and staffing. On the basis of systematic studies comprising some = of=20 these indicators, environmental initiatives were developed, such as = monitoring=20 programs of piezometric levels and groundwater quality measurements, = benthos=20 organism and seawater quality, infrastructure maintenance, effluent = quality,=20 contaminants control and treatment of sewage, and infrastructure = maintenance and=20 control of non-official connection in the storm drainage. It has being=20 implemented a groundwater remediation program for reducing the marine = intrusion,=20 through a hydraulic barrier of exploitation wells in the saline edge. = The=20 modernisation of the management tools comprised training of the = institutional=20 staff, technologic innovation (research and development), equipment, = planning=20 and implementation of the Master Plan and education - awareness of the=20 population. The main lesson learned is that the integrated management of = the=20 water resources takes to the economical, social and environmental = sustainability=20 of the coastal region.

Kelly D.
Development Of Seawater Intrusion = Protection=20 Regulations

Island County is composed of two inhabited Islands, Whidbey and = Camano with a=20 total land area of about 550 square kilometers and a population of = approximately=20 75 thousand people. The islands are located in the saline waters of the = Puget=20 Sound. Rapid growth coupled with a dependence on groundwater has = resulted in=20 concerns over increasing seawater intrusion problems. In response to = these=20 concerns, in 1989 the county adopted the Saltwater Intrusion Policy. The = primary=20 function of the policy was to trigger additional review (of potential = for=20 seawater intrusion) for projects in areas where seawater intrusion = appeared to=20 be occurring. The policy utilized chloride concentrations in wells as = its=20 indicator of seawater intrusion and defined 'risk zones', drawing =BD = mile circles=20 around wells with elevated chloride concentrations. Experience with the = 1989=20 policy has shed light on limitations of the chloride-based risk rating = system=20 including: 1. Other Sources of Chloride (False Positives) =95 Very hard=20 groundwater =95 Septic systems =95 Connate waters =95 Windblown sea = spray =95 Irrigation=20 recharge =95 Well disinfection 2. Transient Response of Interface (False = Negatives) =95 Lateral intrusion may take years to establish a new = equilibrium=20 position =95 Lack of prediction =95 Chloride is a reactive rather than = predictive=20 tool 3. Lack of Confidence =95 Well owners never know if intrusion is = looming,=20 even if there have never been problems in the area. Basic hydrogeologic = theory=20 (Ghyben-Herzberg, Hubbert etc.) suggests that an aquifer that has water = level=20 elevations (pressure) significantly above sea level has little or no = risk for=20 seawater intrusion, while an aquifer with water levels near sea level is = at=20 risk. With these issues in mind, Island County undertook a study to = evaluate the=20 applicability of water level elevation data as a seawater intrusion = risk-rating=20 tool. The study utilized nearly 400 wells across the county; data = collected from=20 these wells include depth to water measurements, major ionic chemistry, = and=20 measuring point elevations. The results of the study supported the = utilization=20 of water level elevations as an analysis tool, and provided guidance for = setting=20 trigger levels that would provide an appropriate level of protection. = The=20 results of this study were utilized to develop a new risk rating system, = codified into seawater intrusion protection code. This system utilizes a = combination of water level elevation and chloride concentrations to = overcome=20 many of the limitations of the chloride-only approach.

Islam SN, Gnauck A
Saline Water Intrusion Due To = Upstream Fresh Water Withdrawal From The Ganges Basin And Threats To = Mangrove=20 Wetlands Ecosystem

The three majors rivers namely the Ganges, the Bramhaputra and the = Meghna=20 (GBM rivers systems) account for 85% of the total dry season stream flow = passing=20 through the coastal zone of Bangladesh. Total area of GBM drainage basin = is 1.55=20 million Sq. Km of which only 8 % in Bangladesh. The hydro-geomorphology = of the=20 region is very active dynamics and complex nature. Since the diversion = of Ganges=20 water at Farakka Barrage in India from early 1975, salinity levels have=20 increased drastically in the south western part of the coastal region = such as in=20 Sundarbans in Bangladesh. A huge amount of fresh water is carried from = the upper=20 catchment areas to the Sundarbans mangrove forest through it's river = systems.=20 The Sundarbans mangrove forest is situated on the Ganges catchment in=20 Bangladesh. It is the largest chunk of mangrove forest in the world and = natural=20 World Heritage site declared by UNESCO in 1997. It is one of the = productive=20 ecosystems and a natural renewable resources. The healthy ecosystems = provides=20 ideal habitats for a variety of plants and animals. A crucial feature of = present=20 day Sundarbans is that only the Baleswar and Passur rivers and their=20 distributaries have direct connection to the Ganges and thus to an = uninterrupted=20 source of fresh water. The Gorai river is the main source of fresh water = supplier to Sundarbans and it is the distributary of the Ganges. After=20 withdrawal the upstream surface water almost (57 % water) high water = salinity=20 intrusion is increased inside of Sundarbans and the dominate species = Sundari=20 (Heritiera fomes) and Goran (Ceriops decandra) are affected by top-dying = disease=20 and some animals species have vanished and some are in the red list for=20 endangered species. The ecosystems management and conservation policies = must=20 therefore be based on a proper appreciation of the social implications = of the=20 proposed actions. The community as a whole may participate in and all = classes=20 benefit from preservation and improvement of mangrove ecosystems. It = must be=20 considered as a part of the major ecosystems and should be planned for = the=20 greater national and international benefits. The paper has been prepared = based=20 on primary and secondary data sources. The objectives of this paper is = to=20 understand the deltaic mangrove forest and it's significance due to high = saline=20 water intrusion in the south western part in Bangladesh. Critical = analysis on=20 ecological and economical benefits of catchment areas .Simulation and = modelling=20 of water salinity would be the suitable tool for the decision maker for = making a=20 long-term management plan and make recommendations for some practical=20 solutions.

Kok A
Salinization Above Sea Level On The Dutch = Wadden=20 Islands

The Wadden Islands are a string of several sandy islands lying off = the coast=20 of The Netherlands, Germany and Denmark. Under these Islands a = freshwater lens=20 has developed according to the 'Ghijben-Herzberg principle'. The depth = of the=20 lens depends upon the size of the dune and height of the groundwater = table=20 (convexity) above sea level in the dune areas. The depth of the fresh- / = salt=20 water interface can be more than 100 metres. Water abstracted from the = lens -=20 pumped with pumping wells - is used for drinking water production. = Salinization=20 caused by upconing or a lateral groundwater flow towards abstraction = boreholes=20 is, of course, a known risk. On the islands of Vlieland and Terschelling = there=20 has been measured a slow but steady increase of chloride in groundwater=20 abstracted for the water supply. In 50 years the concentration has = changed from=20 40 mg/l to an average value of 100 mg/l. The cause of this increase is = not=20 upconing or lateral ingress of brackish or saline groundwater. The = explanation=20 for the increase can be found at the top of the hydrological system, in = the=20 freatic aquifer above sea level. Salinization of the shallow aquifer is = produced=20 by what is called the 'salt-spray mechanism'. At the beginning of the = last=20 century parts of the dune areas on Vlieland and Terschelling were = planted with=20 pine. Sea salts, carried on prevailing west winds, are continuously = deposited on=20 the relatively large leaf surface of the pines and washed down in = precipitation=20 to the freatic groundwater. Thus the chloride level in freatic = groundwater below=20 the forest has increased to 300 mg/l whilst in freatic water in the open = dune=20 areas it has remained below 50 mg/l. Water supply company, Vitens, is = currently=20 carrying out a more detailed investigation of the salt-spray mechanism = on the=20 Dutch islands; monitoring fluctuations of chloride concentrations in and = outside=20 the forest area. Current research includes more frequent daily = measurements of=20 the conductivity of groundwater in observation wells, to see how fast = the=20 chloride concentration in changing in time. These results must be = correlated=20 with precipitation data in order to draw further conclusions about how = the=20 salt-spray mechanism is working exactly.

De Louw P, Stuurman R
Characterization Of = Shallow=20 Brackish Water Systems In The Netherlands

Half of the Netherlands is located below sea level, the so-called = Holocene=20 area. Discharge of deep groundwater occur at more than half of these = lowlands.=20 This groundwater contains high concentrations of chloride and nutrients = causing=20 high nutrient and chloride loads to the surface water and shallow = groundwater.=20 The process of exfiltration of this brackish groundwater and the = patterns and=20 dynamics of freshwater-brackish water interaction at a local scale is = the=20 subject of this paper. An overview will be given of different types of = these=20 shallow freshwater-brackish water environments in the coastal lowlands = of the=20 Netherlands. A classification is made, based on the geohydrological = situation,=20 process of exfiltration, groundwater-surface water interaction, chloride = concentration of the groundwater and patterns and dynamics of the=20 freshwater-brackish water interface. For each type the hydrological = processes=20 will be discussed. The geohydrology determines how and at which rate = groundwater=20 from the first aquifer is flowing through the semi-permeable confining = Holocene=20 deposits to the surface water and shallow groundwater. The lithological=20 composition and thickness of this cover layer together with the head = difference=20 between the hydraulic head in the first aquifer and the phreatic = groundwater=20 level are the main controlling factors. For example, in the reclaimed = lake areas=20 the head difference tends to be more than 2 metres which consequently = cause high=20 exfiltration rates especially where the hydraulic resistance of the = Holocene=20 deposits is reduced due to the presence of sandy creek deposits. It = appears that=20 a large part of the chloride load to the surface water system at = reclaimed lake=20 areas occurs through groundwater exfiltration patches. These patches are = 1 10 m2=20 in area and exfiltration rates are up to 20000 mm per day. Due to these = high=20 exfiltration rates, upconing of deeper groundwater with higher chloride=20 concentration occurs. Besides the exfiltration rate, the shallow = brackish water=20 systems are influenced by drainage. The density and depth of drainage = tubes and=20 the water level in ditches determine the thickness, pattern and dynamics = of the=20 fresh water lens. By taking measures in the surface water systems, water = managers are able to change these hydrological processes. Understanding = of the=20 shallow brackish water systems makes mitigation measures more = effective.

Stuyfzand P
Origin, mineral equilibria and = chemical mass=20 balances for brackish and saline groundwaters in the = Netherlands

Brackish and saline groundwaters are gaining in interest, amongst = others=20 thanks to (a) the increasing possibilities, through developments in = membrane=20 technolgy, to use brackish palaeogroundwaters as an unpolluted source of = drinking or industrial water; and (b) the selection of brackish or = saline=20 aquifers for deep well disposal of membrane concentrate. It is therefore = important to more precisely determine the origin, the quality and = chemical=20 genesis of this heterogeneous group of groundwaters. In this = contribution the=20 focus is directed on those groundwaters which lack a continental salt = origin,=20 namely: (1) (sub)recent, intruding North Sea water; (2) Holocene = transgression=20 waters; (3) brackish to saline groundwater of Late Tertiary to Early = Pleistocene=20 age; and (4) halite leachate. Extensive analyses (20 main constituents, = 10-50=20 trace elements and 2-5 isotopes) on 250 samples of brackish to saline=20 groundwaters scattered over the Netherlands were selected. They were = grouped=20 into the above-mentioned 4 types of origin, using appropriate tracers = like δ18O=20 + Cl, 14C, B + Cl, Sr + Cl, Ba, Sb, ratios of Cl / Br, ΔSO4 / TIC, = NH4 / TIC, K=20 / Cl + Mg / Cl, SO4 / Cl, Ba / Ge and Li / Rb. The better and cheaper = tracers=20 for specific identification questions are indicated. Subsequently = mineral=20 equilibria were calculated for each sample using PHREEQC-2, in order to = identify=20 potential solid phases that either dissolve from the aquifer matrix, or=20 precipitate. Thus identified solid phases were, after a specific filter, = automatically incorporated into the last step, heading for the chemical = mass=20 balance. This balance is composed of a set of reaction equations, = summing up all=20 resulting mass transfers between the original water (ocean and/or = admixed fresh=20 water), and the groundwater sampled. The mass balance calculations were=20 performed on all samples using a relatively simple spreadsheet program = set in=20 EXCEL. The contribution of the following processes to water quality was = thus=20 quantified: the mixing of the end-members 'pure ocean water' and 'fresh = water',=20 the dissolution and precipitation of CaCO3, CaMg(CO3)2, FeCO3, FeS2 and = Fe(OH)3,=20 oxidation of bulk organic material and methane, cation exchange, and the = transformation of clay minerals (especially glauconite).

Sodde M, Barrocu G
Seawater intrusion and = arsenic=20 contamination in the alluvial plain of the Rivers Quirra and Flumini = Pisale,=20 south-eastern Sardinia

The alluvial plain of the Quirra and Flumini Pisale rivers is located = along=20 the south-eastern coast of Sardinia (Sarrabus) north of the village of=20 Villaputzu. Water supply for the agricultural and animal raising = activities=20 carried out in the plain is provided by numerous dug wells that tap the=20 unconfined groundwater hosted in the alluvial sediments. Groundwater = chemistry=20 is significantly affected by seawater intrusion and by the widespread = presence=20 of tailings in the alluvial sediments. These tailings were produced by = the=20 arsenopyrite and galena mines that once operated on the banks of the = Baccu Locci=20 river, right tributary of the Quirra river. Arsenic and chloride = concentrations=20 exceeding the regulatory limits have been detected in several wells. The = presence of two contamination sources, combined with the complexity of = ongoing=20 processes in the coastal aquifers, necessitated a detailed hydrogeologic = and=20 hydrochemical characterization of the study area. Geological and = stratigraphical=20 data alone did not provide a clear understanding of the hydrogeological = setting.=20 The use of geophysical surveys, carried out with electrical tomography = and IP=20 methods, enabled to identify a main unconfined aquifer. This is a = locally=20 multilayered aquifer hosted in the alluvial terraces of Holocene age = that=20 stratigraphically overlie a second layer of well-cemented terrace = alluvium, with=20 low permeability, resting on the metamorphic basement. In order to = define the=20 areal extent of seawater intrusion and to determine groundwater flow = properties,=20 during the last hydrologic year we measured piezometric level and = physical=20 parameters (T, pH, EC) every two months at 69 observation points, = covering an=20 area of roughly 10 km2. Preliminary evaluation of the fresh-saltwater = interface=20 position, determined using the Ghyben-Herzberg method, has been = confirmed by=20 geophysical surveys and the results are consistent with the chloride=20 concentration distribution throughout the plain. The chemical data for = the=20 groundwater samples collected have been processed using multivariate = statistical=20 methods (factor and cluster analysis). These methods have proven = particularly=20 useful for identifying the most important parameters involved in saline=20 intrusion and provided valuable information for optimising future=20 investigations. No evidence was produced about the parameters involved = in=20 arsenic mobilisation, that do not appear to be influenced by groundwater = salinity. The resulting conceptual scheme forms the starting point for = the=20 implementation of a mathematical model for simulating contamination = phenomena in=20 the plain. This is a useful tool for predicting the effects of increased = extraction on groundwater quality and for verifying the results of a = future=20 reclamation project.

Soddu S, Barrocu G
Saltwater intrusion in = Arborea area=20 (central-western Sardinia)

The reclaimed land of Arborea, covering some 70 km 2, is = the most=20 productive area in Sardinia (Italy) in terms of agriculture and animal = raising.=20 The main outcropping formations in the plain are Quaternary sands and = gravels.=20 Two main aquifer systems have been identified: a shallow phreatic = aquifer and a=20 deep multi-layer aquifer with varying degrees of confinement.
Both = aquifers=20 are now showing signs of intense overexploitation. Significant lowering = of=20 piezometric levels has been observed as well as salt water intrusion and = groundwater contamination, caused by the large number of farms in the = area.
A=20 preliminary numerical model has been developed for this zone, using the = CODESA=20 3D finite element code, that enabled to formulate various hypotheses = concerning=20 the causes and mechanisms of groundwater salination.
Continued = monitoring,=20 for collecting new water level measurements and chemical data, combined = with=20 vulnerability studies has improved groundwater characterization in the = Arborea=20 area, thus establishing a basis for updating and completing the = numerical=20 model.

Manzano M, Custodio E, Loosli H
The Influence Of = Seawater Intrusion On Pollutant Diffusion In An Industrialized Coastal=20 Area

The area concerned by the events described herein surrounds the Gulf = of=20 Augusta in Sicily, where in 1950 the petrochemical hub of Augusta =96 = Priolo =96=20 Syracuse, one of the most important industrial hubs in Italy, was set = up. The=20 industrial settlement progressively transformed the local environment = and the=20 small towns of Megara Iblea and Melilli Marina disappeared. Industries = drilled=20 more than one hundred wells, exploiting local groundwater reserves to = satisfy=20 the ever-growing demand for fresh water. Irrational, uncontrolled and=20 competitive groundwater abstraction in the 1960s -70s, produced a water = level=20 drawdown to 50 metres below sea level, resulting in severe seawater = intrusion,=20 amply reported in the literature . Two aquifers existed locally, a = phreatic=20 aquifer in the Quaternary sediments overlying Pliocene-Pleistocene = clayey=20 sediments, and a more important deep confined aquifer, hosted in the=20 water-bearing limestones and calcarenites of Mio-Pliocene age. These two = initially separate aquifers, were connected by a number of boreholes = carelessly=20 drilled by industries. Seawater intrusion was first detected in the = surficial=20 aquifer and subsequently seriously affected the deep aquifer, impairing=20 groundwater quality for industrial use and drinking water supplies. = Furthermore,=20 groundwater and soils were jeopardized in depth by pollution from both=20 industrial waste dumps and refinery products leaking from tanks and = pipelines=20 damaged by local seismic activity. The discovery of a large quantity of=20 hydrocarbons in some wells alarmed the population and local authorities=20 responsible for pollution control. A major and comprehensive campaign of = investigations, which involved drilling hundreds of geognostic boreholes = equipped with piezometers, indicated the magnitude and extent of = contamination.=20 In the 1970s and '80s, industries attempted to check saline intrusion by = stopping groundwater abstraction from the wells nearest the coast, = drilling new=20 ones inland. However, this did not produce satisfactory results as = contamination=20 was detected at the surface and in depth even in the remotest wells, = with the=20 result that industries eventually decided to close and seal a number of = wells=20 definitively. Since the surface strata were considered irretrievably = lost, the=20 attention was focused on the diffusion of pollutants in the deep aquifer = also=20 exploited for drinking water. A detailed epidemiological investigation = recently=20 showed a statistically significant increase in the number of cancer = cases and=20 deformities in the area, especially among people living at Augusta, = Melilli and=20 Priolo, alarming the local population and authorities. The phenomenon = has been=20 studied in order to devise a rational land restoration programme locally = and=20 analyse pollutant transport from the deep aquifer to the fresh water. = Pollutants=20 such as products for mineral oil refinement, synthetic materials and = heavy=20 metals permitted to perform an accurate three-dimensional reconstruction = of=20 local water-bearing zones and to study water flow. It is clear how the=20 progressive mixing of polluted and brackish water, coming from saline = intrusion,=20 causes the diffusion of pollutants, also helped by their sulphur and = chloride=20 content that make them readily soluble. Pollutants movement in natural = flow=20 directions has been modified by two elements: the hollow produced by = irrational=20 exploitation of the land and the presence of brackish water that changes = the=20 salinity of certain pollutants. This review provides a description of=20 particularly interesting facts and events.

Di Sipio E, Galgaro A, Zuppi GM
Salt Water = Contamination=20 On Venice Lagoon Mainland: New Evaluation Of Origin, Extension And=20 Dynamics

The Venice Lagoon mainland is affected by salt water contamination on = coastal=20 and circum-lagoonal aquifers owing both to sea and lagoon nearness. The=20 territory, characterized lithologically by alternance of silt, clay and = sand=20 layers of marine, continental and marshy origin, shows several critical=20 conditions, as existence of paleorivers, lagoonal paleochannel, rivers = suspended=20 above the surrounding land, downstreaming above sea level related to = subsidence=20 and reclaimed land, that contribute to increase the groundwater = salinization=20 phenomenon. Area with high permeability values seems constitute a = preferential=20 way of movement for salt water from sea or lagoon towards inland and old = fossil=20 water seem able to reach the surface and contribute to increase the salt = pollution processes. In fact, during 1970s, several researches have = detected=20 throughout the territory the existence of a deep salt water aquifer = storing=20 fossil saline water at a depth of about 300-450 m in the southern part = and of=20 more than 600 m in the northern part of the Venice mainland. Salt water=20 contamination of subsoil could cause ground salinization and, = consequently,=20 desertification of the area, with a great economical damage, owing the = great=20 agricultural development of the territory and the touristic interest of = the=20 coast. The combined use of adequately validated geophysical and = geochemical=20 tools confers a multidisciplinary character to the research and allows = to define=20 the phenomenon superficial extension. Geophysical analysis based on = Vertical=20 Electrical Sounding (VES) and conductivity logs have been performed = together=20 with piezometry measurements and geochemical analysis on samples = collected on=20 selected wells. Moreover, a critical revision of old geophysical data = allowed to=20 verify possible saline contamination changes in time. Interesting = results has=20 been obtained within the southern and the northern sector of the Venice = lagoon=20 mainland, consisting respectively of Chioggia and Jesolo territory. In = the first=20 case relationship between chemical and conductivity logs analysis = reveals a=20 complex variability on ground permeability while geophysical data show = the salt=20 water intrusion limits and a dislocation of the aquifer basement. In the = second=20 one, considering influence of Piave and Sile rivers and presence of = coastal sand=20 dune, it is possible to define a salt water contamination risk map to = evaluate=20 the agricultural use of superficial water. Therefore, aim of this = research is to=20 define the effective origin of salt water found all over the lagoon = mainland,=20 its distribution and extension and its preferential way of movement = within the=20 territory, relating all the information acquired to the geological,=20 geomorphological and stratigraphic characteristics of the area.

Tarhouni J, Ben FH, Aouadi C, Khlaifi I
Entropic = Impacts=20 On Groundwater Resources In Coastal Aquifers And Remediation=20 Analysis

In coastal areas, as population continue to expand, the need for = groundwater=20 withdrawals iscertain to increase. The correlated analysis of economical = sectors=20 development and the groundwater resources evolution confirms the = negative=20 effects of entropic activities on these resources. The groundwater = resources=20 depletion and salinisation are well explained by the development history = of the=20 concerned area both in economical and population evolution point of = view.=20 Particularly, the intensification of agriculture, as main sector in = these areas,=20 has got many negative effects on the groundwater water resources for = several=20 reasons such as: high rate of water consumption and diffuse pollution by = nitrate=20 or others. In the beginning of economic expansion period, the main goals = concerned the agriculture production increase and water supply for = peri-urban=20 and urban areas without any care for the waterresources quantity nor = quality. At=20 this period, population and, specially, rural population was frequently = exposed=20 to famine and water scarcity. Face to this situation, the government was = encouraged to drill and to equip wells by pumps for irrigation and water = supply.=20 The consequent increase in withdrawals was quickly resulted in a = continual=20 depletion of groundwater resources and the degradation of their quality. = Indeed,=20 during the two decades, the salt intrusion becomes problem in many = coastal=20 aquifers that are hydraulically connected with sea water. As example, = the case=20 of the northern-eastern coastal aquifer and El Houaria one are = considered to=20 demonstrate the effects of entropic activities. As first step to prevent = saltwater intrusion, the size and extend of the affected area are = evaluated on=20 the basis of monitoring threatened wells, water sampling and analysis; = also,=20 others investigations methods such as electrical resistivity method were = been=20 applied. The interpretation of the results confirms that the saltwater = intrusion=20 as main problem of increase in the salinity. In this paper, a synthesis = of=20 several methods applied and of accomplished investigations is done in = order to=20 analyse the hypothesis of saltwater intrusion. In a second step, using=20 simulation, analysis is done to evaluated the total necessary recovery = time to=20 restore the initial condition in order to give the importance of the = hydraulic=20 disequilibrium resulted from the economical activities intensification. = In the=20 last part, of the communication, an analysis of the impact of some = remediation=20 solutions is done on the basis of a coupled flow-transport in saturated = area=20 (MODFLOW). Two main questions are focused on: the relocation of wells in = the=20 country side and the increase of recharge using specific management. =

Kiro Y, Yechieli Y, Starinsky A, Lyakhovski V, Shalev=20 E
The Effect Of The Dead Sea Level Changes On The = Fresh-Saline=20 Interface

The Dead Sea water level has been decreasing since the sixties = because of=20 human influence on its water budget. In the past 50 years the level has = dropped=20 25 meters, reaching a rate of 1 m/yr in the past few years. The = recession of the=20 Dead Sea is much more rapid than natural processes and it affects the=20 groundwater level and fresh-saline interface in the Dead Sea area. The = present=20 study aims to determine the hydrological processes in time and space in = this=20 extremely dynamic system. For this purpose, the fresh-saline interface = and=20 groundwater level are monitored at the alluvial fan of Wadi Arugot up to = 2 km=20 from the coast. The groundwater level has decreased at almost the same = rate as=20 the Dead Sea in recent years. The fresh-saline interface has also = decreased,=20 reaching a 2-meter drop near the coast in the last two years. = Furthermore, rapid=20 decrease in water salinity above the fresh-saline interface indicates a = fast=20 flushing rate of the Dead Sea water in the aquifer. An interesting = observation=20 at boreholes farther from the coast is an upward movement of the = fresh-saline=20 interface. This upward movement is not affected by the Dead Sea level = drop, and=20 could be the response of the interface to the groundwater level drop. = The Dead=20 Sea level drop is accompanied by a change in the chemical composition = (e.g.=20 Na/Cl changing from 0.28 to 0.23), while its salinity (340 g/l) has not = varied=20 much. This creates a dynamic system of a receding lake whose composition = changes=20 continuously. Therefore, profiles of the chemical composition in = boreholes can=20 imply the dynamics in the groundwater system. Dead Sea water from a few = decades=20 ago was found above more recent saline water. This suggests that there = is a=20 continuous lateral flow of saline water from the Dead Sea into the = aquifer.=20 Steady state and transient simulations were done on the Dead Sea = groundwater=20 system with the SUTRA model. The simulations were for a case of a = phreatic=20 aquifer with a changing boundary condition representing the Dead Sea = level=20 changes. The simulation results show good agreement with the field data, = both in=20 time and space. Furthermore, in the dynamic system of a lake level drop, = the=20 simulations enable to determine when an inflow or an outflow of saline = water=20 occurs beneath the fresh-saline interface. Preliminary simulations show = that=20 high dispersion coefficient causes a saline water flow from the lake to = the=20 aquifer while high storativity or low permeability cause flow to the = lake. The=20 simulation results and field data will allow the prediction of the = system=20 behavior in the future.

Bablani SA, Soomro SA
Evaluation Of Seawater = Intrusions=20 In The Left Bank Sediments Of Coastal District Thatta, Sindh,=20 Pakistan

Due to insufficient fresh water flow downstream the Kotri barrage = built on=20 river Indus, seawater from Arabian sea has penetrated into coastal = sediments of=20 southern Sindh, Pakistan. Due to large mixing of seawater into = groundwater, the=20 coastal aquifer system has been polluted at alarming level and = environment &=20 ecosystem have been ruined in the region. To evaluate the extent of = seawater=20 intrusions in the area, three techniques Isotopic, Chemical analysis and = Geophysical survey were applied. The water sampling network based on=20 construction of six piezometers, two each at Sujawal, Jati and Shah = Bundar area=20 was established. Water samples were collected upto the depth of eighty = feet from=20 the ground surface through piezometers to perform Isotopic analysis for=20 determination of Oxygen-18 & Deuterium isotopes (18O & 2H) and = Chemical=20 analysis for determination of Chloride & Bicarbonate ions ratio. In = addition=20 to this drill log of all piezometers and surface Geophysical Resistivity = method=20 were also used to compare and correlate the results of seawater = intrusions and=20 their variations during the Dry and the Wet seasons of the years = 2002-2003 &=20 2003-2004. Permeability values of sand samples collected while drilling = and=20 installing piezometers at different depths were measured in the = laboratory by=20 various methods. Permeability values of sand (aquifer) can be classified = as=20 Moderate to Low. The Isotopic and Geochemical evaluation in groundwater = samples=20 supplemented by Geophysical method reveal the presence of a significant=20 contribution of seawater intrusions into groundwater system during Dry = & Wet=20 seasons. During the year 2002-2003 the contribution of seawater into = groundwater=20 has been measured through isotopes of Oxygen & Hydrogen was upto the = extent=20 of minimum (18%) at Sujawal which is about 75 km away from the Coast and = maximum=20 (92%) at Shah Bundar which is on the Coast. During the year 2003-2004 = the=20 contribution of seawater into groundwater was lowered upto the extent of = minimum=20 (17%) at Sujawal and maximum (77%) at Shah Bundar, due to release of = substantial=20 amount (about20 MAF) freshwater downstream below the Kotri barrage.

De Montety V, Blavoux B, Valles V, Radakovitch O, Hermitte=20 D
First Results About The Water Chemistry Origine In The = Deep=20 Alluvial Aquifer Of The Rhone Delta, Camargue

This study deals with the deep alluvial aquifer of the Camargue delta = (750=20 km2), located in the south of France between the two arms of the = Rh=F4ne. It is a=20 confined aquifer which lies on a marnous substratum and dips from -10m = at the=20 North-East to -55m at the South-West with a variable thickness (between = 20m=20 to70m). This aquifer have strong values of EC (from 5 to 58mS/cm) = raising from=20 the North of the delta to the Mediterranean Sea. Moreover, since the = 70's the=20 nearest boreholes of the sea have shown an increase of the salinity = going to an=20 over-salinization (38g/l) for one of the point. This present work tries = to=20 determine the origin of this water chemistry and the influence of the = sea on the=20 aquifer. Two approaches are considered: a natural tracing approach with = monthly=20 sampling in 8 boreholes reaching the deep aquifer for the analyse of the = major=20 ions and stable isotopes (18O, 2H, 13C) and a hydrodynamic study = including a 20=20 minutes steps monitoring of the pressure, the temperature and the EC in = 3=20 boreholes. A monitoring of the Mediterranean Sea and the Rh=F4ne is also = done. The=20 jointly use of Cl and 18O analyses have underline that the chemistry of = the deep=20 aquifer does not result from a simple mixing between the Mediterranean = Sea and=20 the Rh=F4ne. There is a contribution of a third reservoir which could be = the=20 superficial over-salted aquifer. This influence could be explained by = downward=20 leakage or by seepages from the boreholes. The first results of 13C = analyses of=20 the total dissolved inorganic carbone show the influence of the = degradation of=20 the fossil organic matter in the deep aquifer. Finally, time series = analyses=20 have underline periodic fluctuation of 12 and 24 hours on the water = table=20 signal. Correlative and spectral analyses will be apply to determine if = it is=20 due to the sea tide or to the earth tide.


Submarine Groundwater Discharge


Robinson C, Li L
Tidal dynamics in a = subterranean=20 estuary

"Contribution of tidally-driven recirculation to near-shore submarine = groundwater discharge" Submarine groundwater discharge (SGD) represents = a=20 significant transport pathway for anthropogenic chemicals into coastal = waters.=20 It consists of both terrestrially-derived fresh groundwater flow and = recycled=20 seawater caused by the water exchanging between the aquifer and ocean = [Taniguchi=20 et al., 2002]. The recycling of seawater across the boundary of the = near-shore=20 aquifer is a complex and dynamic process driven primarily by oceanic = forcing=20 (tides and waves) and density dependent flow. Although it has been = theoretically=20 shown that tide and wave-driven circulation may account for up to 96% of = the=20 total SGD in the near-shore region [Li et al., 1999], previous studies=20 attempting to quantify discharge rates neglect the dynamic effects of = oceanic=20 forcing on the exchange process. Also, SGD field measurements reported = often do=20 not separate the "fresh" from the "recycled" components, despite the=20 significantly different implications associated with each. This paper = presents=20 numerical results which quantify the magnitude of water exchange from = the=20 aquifer to sea driven by tidal oscillations. Fresh groundwater discharge = in the=20 presence of tidal forcing across a sloping beach face is simulated using = the=20 density-dependent groundwater code SEAWAT-2000 [Langevin et al., 2003]. = A=20 parametric study based on a set of non-dimensional variables has been = conducted=20 to identify conditions under which tidally-driven recycled seawater is = likely to=20 constitute a large portion of the total SGD in the near-shore region. It = is=20 revealed that the tide-induced exchange rates are strongly related to = the=20 external forcing of the tide relative to that of the fresh groundwater = flux.=20 Aquifer properties including the hydraulic conductivity, aquifer depth = and beach=20 morphology also have a significant effect on the exchange rates. The = results=20 suggest that tides may represent a main forcing for water exchange = between the=20 aquifer and ocean, particularly on coasts with significant tidal range. =

De Oliveira J, Da Costa Lopes J
Assessment Of = Submarine=20 Groundwater Discharge And Seasonal Oscillations In Seawater Rn-222 = Inventories=20 Of Ubatuba, Brazil

A potential means of determining groundwater pathways and flux rates = into the=20 coastal zone is the application of 222Rn as a natural tracer. The 222Rn = levels=20 often found in groundwater are 2-4 orders of magnitude higher than those = radon=20 levels observed in seawater. Besides that, 222Rn is a natural = short-lived=20 radioisotope (t1/2 =3D 3.83 days) and is chemically inert. This method = is an=20 excellent qualitative tool for identifying areas of spring or seepage = inputs in=20 most coastal environments. It can also be a good quantitative tool in = shallow=20 marine environments characterized by large amounts of submarine = groundwater=20 discharge (SGD) under certain conditions. We describe here an = application of=20 222Rn in excess to estimate SGD in a series of small embayments of = Ubatuba, S=E3o=20 Paulo State, Brazil, covering latitudes between 23=B0;26'S and = 23=B0;46'S and=20 longitudes between 45=B0;02'W and 45=B0;11'W. Ubatuba region is located = about 270 km=20 north S=E3o Paulo and it is considered a tropical coastal area. The main = geologic/geomorphologic feature is the presence of pre-Cambrian granites = and=20 migmatites of a mountain chain locally called Serra do Mar (altitudes up = to=20 1,000 meters), which reaches the shore in almost all of the study area, = and=20 limits the extension of the drainage systems and of Quaternary coastal = plains.=20 In the study area the coastal aquifer system can be classified as a = fractured=20 rock aquifer, covered by Pleistocene and Holocene sediments. The = discharge=20 pattern of this kind of aquifer is spatially heterogeneous, with = preferential=20 flow paths along rock fractures. 222Rn in excess inventories obtained in = 24=20 vertical profiles established from March/03 to July/05 varied from 345 =  24 to=20 18,700  4,900 dpm/m2. The highest inventories of 222Rn in excess = were observed=20 both in Flamengo and Fortaleza embayments, during summer campaigns = (mostly in=20 March), which corresponds exactly to the month of highest pluviometry = (about=20 344.9 mm). The annual pluviometric rates at Ubatuba region varies from = 1,500 to=20 2,000 mm, August is the only month presenting pluviometry lower than 100 = mm. The=20 estimated total fluxes required to support inventories measured varied = from 62 =20 4 to 3,385  880 dpm/m2 d. Considering these results, the SGD = advective rates=20 necessary to balance the sub-pycnocline fluxes calculated in Ubatuba = embayments=20 ranged from 0.1 x10-1 to 1.9 cm/d. Taking into account all fluxes = obtained, the=20 percentual variability was 89% (seasonal variation in 3 years period, n = =3D 24=20 measurements). Although, if we consider each year of study separately, = the=20 respective percentual variabilities estimated are 72% in 2003 (n =3D 10=20 measurements), 127% in 2004 (n =3D 6 measurements) and 97% in 2005 (n = =3D 8=20 measurements).

Weinstein Y, Barak H
Sgd In The Eastern=20 Mediterranean

In the Mediterranean coast of Israel, two aquifers are draining to = the sea =96=20 the Pleistocene coastal granular aquifer and the Cretaceous carbonate = one. The=20 Pleistocene aquifer is mainly phreatic, while the carbonate aquifer is = usually=20 confined, but drains to the sea at several locations along the northern = coast=20 (the Carmel and Galilee areas). In a survey conducted in shallow coastal = water=20 during the summer 2004 we found a large number of sites with high 222Rn=20 activities and low salinities (up to 28 dpm/l and as low as 12 ppt,=20 respectively) along the northern coast, implying the existence of = Submarine=20 Groundwater Discharge (SGD) in this area. On the other hand, high = activities of=20 222Rn were not found at any southern coastal site during the dry season, = but=20 activities as high as 3 dpm/l were found during the rainy season. The = reduced=20 SGD in the south is probably due to the efficient confinement of the = Cretaceous=20 carbonate aquifer and to the reduced hydraulic heads in the overlying=20 Pleistocene granular aquifer. On the other hand, the SGD at the north is = from=20 the Cretaceous aquifer, either by direct discharge to the sea or through = the=20 overlying Pleistocene aquifer. The latter becomes possible due to the = absence of=20 confining layers or via transversal faults, which are very frequent in = this=20 area. A radon and electric resistivity survey, conducted in deeper water = (5-10=20 m) along the northern coast, suggests that deep water SGD is limited to = just a=20 few sites. Some of these sites show a correlation with bathymetric = features that=20 were located by a multi-beam. Unlike radon, 226Ra activities were = usually low=20 (<0.3 dpm/l), suggesting that the discharge is mainly of fresh water. = Time=20 series measurements conducted in several northern sites show that radon=20 activities vary significantly (by up to a factor of 5) with prominent = tidal=20 patterns. A calculation based on the variability in radon activities = (Burnett=20 and Dulaiova, 2003) shows that the SGD fluxes to two northern sites is = on the=20 order of 5-6 cm/day. A large tidal variability (factors of 2-5) was also = observed in groundwater in onshore well in the Carmel area. Nutrients = are=20 usually significantly higher in high radon sites than in other eastern=20 Mediterranean coastal water. This is especially true for enclosed water = bodies,=20 where nitrates get as high as >100 mM compared with 0 to 3 mM in = nearby=20 eastern Mediterranean coastal water.

Aureli A, Cusimano G, Fidelibus D, Gatto L, Hauser S, Privitera = AMG,=20 Schiavo AM, Zuppi GM
Characterization Of Submarine = Groundwater=20 Discharge Along The South-Eastern Coast Of Sicily (Italy)

Within the research and the management of ground waters, an important = role is=20 played by coastal aquifers, polluted due to salinization and human = activities,=20 which pose serious concerns to the economy of the related territories. A = project, established through collaboration between the Italian = Universities of=20 Palermo, Bari, Venice and the IAEA and UNESCO International = Institutions,=20 concerned the study of the coastal aquifers of the south-eastern coast = of=20 Sicily, from Syracuse to Donnalucata, showing specific characteristics. = The=20 studied area is known as Hyblean Plateau: it is characterized by = outcrops of=20 carbonate and vulcanite outcrops, connected to the tectonic activity = during the=20 Cretaceous and the Pliocene period. The aquifers were selected since the = related=20 territories are subject to groundwater over-exploitation due to the high = water=20 demand connected to intensive agricultural practices: thus, aquifers = result=20 polluted and their coastal condition involves, under over-exploitation, = the=20 disturb of the equilibrium between fresh ground waters and seawater = present=20 inland, with consequent salinization. The research project involved the = study,=20 from the geochemical and isotopic point of view, of well waters, springs = and=20 submarine discharges in order to understand the relationships existing = among=20 these waters, to identify the best tracers of the natural and = human-related=20 phenomena occurring in the area as well as to estimate the presence of = possible=20 environmental effects of them on the sea ecosystem. Hydrogeochemical = surveys=20 were carried out, every three months, from 2002 to 2004 on a net of = wells,=20 sub-aerial and submarine springs: the present report synthesizes the = main=20 results of the research. Key words: Groundwater, coastal area, tracers, = mixing,=20 Sicily.

Groen JJ, Groen MMA, Post VEA, Kooi H
Seaward=20 Continuation Of Groundwater Flow Systems Along The Coast Of The=20 Netherlands

Geophysical and hydrogeological methods were used to study the = offshore=20 continuation of groundwater flow conditions and submarine groundwater = discharge=20 along the coast of TheNetherlands near the towns of Zandvoort and = Wassenaar. A=20 belt of dunes, several kilometers wide, borders the coast in the area. = The dune=20 system is used by water supply companies for artificial recharge of = surface=20 water and subsequent abstraction of the filtrated groundwater. The fresh = water=20 lens in the dune belt penetrates most of the underlying Pleistocene = aquifer=20 system to a depth of about 120 m. A phreatic and semi-confined aquifer = can be=20 distinguished, separated by a Holocene unit with a variable clay = content. First,=20 onshore, vertical electrical sounding (VES), continuous VES and time = domain=20 electromagnetic measurements (TDEM) were conducted to characterize the = lens=20 geometry. Cone penetration tests for electrical conductivity (CPCT) and = pore=20 pressure were conducted on the beach down to the mean low water line to=20 constrain the interpretation of the geophysical measurements. The = measurements=20 revealed a brackish phreatic aquifer and saline confining layer, = underlain by a=20 variable thickness fresh water layer in the semi-confined aquifer. = Subsequently,=20 offshore TDEM measurements were made using a floating, coincident,=20 antennae/receiver loop, 40 m in diameter. Evidence for fresh-water = beneath the=20 seafloor was found up to several hundreds of meters off the coast. = Hydraulic=20 head monitoring allowed study of the tidal response of the semi-confined = aquifer=20 from which the hydraulic properties of the semi-confined aquifer were = derived.=20 These were used in a variable-density flow and transport model to = investigate if=20 the data represent (quasi-)steady outflow conditions, or whether the = offshore=20 fresh water distribution reflects transient conditions associated with = recent=20 coastline migration and onshore activities in the dune area.

Bratton JF, Colman JA, Crusius J, Mccobb TD, Massey AJ, Koopmans = DJ,=20 Masterson JP
Evidence And Implications Of A Fresh = Groundwater=20 Flow System Beneath A Shallow Coastal Estuary In New = England

Coastal resource managers are very concerned about nutrients that are = entering many estuaries via submarine groundwater discharge. These = nutrients are=20 contributing to eutrophication and harmful algal blooms. A drilling = operation=20 was conducted at an estuary on Cape Cod, Massachusetts, to test = hypotheses about=20 groundwater flow under and into the estuary, and to constrain results of = previous geophysical surveying and modeling efforts. A barge-mounted = drilling=20 rig was used to advance an electrical resistivity probe and collect = submarine=20 groundwater samples in a transect of seven sites spanning a kettle pond = breached=20 by rising sea level, a shallow estuary, and a channel linking the pond = and=20 estuary. Results are consistent with continuous resistivity profiling = data=20 collected in 2004 using a surface-towed system. Sampling and geophysical = measurements indicate that the kettle pond, Salt Pond, is underlain by = brackish=20 groundwater in generally fine-grained sediments as deep as 15 m below = the=20 sediment surface. The channel connecting the pond to the rest of the = estuary has=20 nearly fresh water present at shallow depths (3 m below the sediment = surface or=20 less) that originates as recharge in upgradient areas on shore. Some of = this=20 fresh water may flow completely under the pond before rising beneath the = channel. The area of the estuary adjacent to the channel, Salt Pond Bay, = is=20 underlain by a layer of fresh ground water over 15 m thick that extends = as far=20 offshore as measured (about 425 m). This offshore flow is the result of=20 fine-grained surficial sediments extending 2 to 3 m below the sediment = surface=20 and acting as an aquitard to downward flow of overlying saline water, = and upward=20 flow of underlying fresh water. The implication for the water and = nutrient=20 budgets of the system is that there is a significant amount of = groundwater that=20 bypasses the pond, channel, and bay before discharging more than 500 m = offshore.=20 The convoluted shoreline configuration, shallow depth, and fine-grained=20 sediments found in this estuary system are not uncommon in the = northeastern=20 U.S., Canada, and northern Europe. This suggests that shallow embayments = located=20 along formerly glaciated coastlines, such as the one investigated on = Cape Cod,=20 may commonly be underlain by extensive fresh groundwater flow systems = that=20 discharge in unpredictable locations.

Michael HA, Mulligan AE, Harvey CF
Saline water = exchange=20 between aquifers and the coastal ocean driven by the seasonal hydrologic = cycle

Fresh and saline groundwater flowing from coastal aquifers into the = ocean is=20 an important pathway for transporting nutrients and contaminants across = the=20 sediment-water interface and can adversely affect coastal ecosystems. = Field=20 measurements during five summers in Waquoit Bay, Massachusetts reveal = the=20 pattern and composition of this submarine groundwater discharge (SGD). = Maximum=20 discharge occurs in two bands parallel to the shoreline: brackish = outflow=20 nearshore and saline discharge offshore. Most of the total outflow in = the summer=20 is saline, yet net seawater inflow over a tidal cycle is negligible. = Circulation=20 mechanisms such as tides, waves, and hydrodynamic dispersion cause = significant=20 saline groundwater discharge, and are potentially important for chemical = loading=20 to estuaries. However, these mechanisms can explain only a fraction of = the=20 observed saline outflow in Waquoit Bay and produce zero net flow over a = tidal=20 cycle. We propose that large-scale saline discharge is caused by = seasonal=20 movement of the freshwater-saltwater interface within coastal aquifers = that is=20 driven by, but lags, seasonal recharge. A series of idealized numerical = models=20 demonstrates this process for a range of realistic aquifer parameters, = and a=20 time lag between maximum recharge and simulated peak discharge may = explain the=20 observed net discharge during times of low recharge. Winter hydraulic = gradient=20 measurements in Waquoit Bay indicate inflow in the zone of peak summer = saline=20 discharge, confirming seasonal variation in SGD at this field site.

Karam H, Gardner A, Mulligan A, Harvey C
A novel = low-cost instrument for measuring small-scale head gradients and its = application=20 to automatically monitoring submarine groundwater = discharge

We present the design of a relatively low-cost differential pressure = sensor=20 for determining head gradients across the groundwater-surface water = interface.=20 This device includes a differential pressure transducer and a = conductivity cell=20 with a temperature sensor. By connecting it to a drive-point piezometer = inserted=20 into sea-bottom sediment, the device measures the vertical hydraulic = gradient=20 across the sediment/water interface, as well as the salinity (electrical = conductivity) and temperature of both sediment pore water and ambient = seawater.=20 The instrument takes a zero reading, where both ports of the pressure = transducer=20 are connected to either ambient seawater or groundwater, prior to = measuring the=20 desired pressure difference. This facilitates the correction of any = zero-offset=20 errors in the collected data, which is critical for capturing the true = direction=20 of water flux across the seafloor. Temperature and salinity information = are used=20 in post-processing vertical hydraulic gradient data to correct for any = density=20 difference between sediment pore water and seawater, as well as to = provide=20 information on the origin of the water seeping through sea-bottom = sediments.=20 Batteries housed within the instrument provide adequate power to operate = it for=20 more than six months at a time, as it autonomously records high = frequency=20 measurements (every 15 minutes) to a local flash memory card. This = longevity is=20 necessary for collecting data during winter months when near-shore = waters=20 freeze. Data from laboratory-based work to calibrate and test the = instrument are=20 presented. Additionally, the results of preliminary, short-term field = tests are=20 described.
This differential pressure sensor is a promising new tool = for=20 understanding water fluxes across the seafloor in near-shore = environments.=20 Through temporary deployment of a seepage meter, the collected pressure = gradient=20 data can be calibrated to provide information on rates of water flux = into and=20 out of the sediment. A network of such differential pressure sensors can = be=20 deployed to autonomously observe the spatial distribution of advective = flows=20 across the seafloor in a near-continuous manner. We expect such data to = be very=20 valuable in quantifying the magnitudes of water exchange between the = subsurface=20 and coastal oceans, and the role of various processes that may drive = this=20 exchange over different timescales (for example: storms, waves, tides, = and=20 changes in the inland water table).

Spiteri C, Slomp CP, Meile C
Modeling = Biogeochemical=20 Processes In Subterranean Estuaries: The Effect Of Flow Dynamics And = Redox=20 Conditions On Submarine Groundwater Discharge Of Nutrients

Submarine groundwater discharge (SGD) is an important transport = pathway for=20 dissolved chemical species from land to coastal waters. SGD of nutrients = is of=20 particular relevance since it can cause eutrophication problems in the = coastal=20 zone, such as the triggering of nuisance algal blooms, especially in = areas with=20 high anthropogenic inputs to groundwater. Even though rates of SGD may = not be=20 remarkably high (worldwide range of 0.03 to 454 m yr-1, most of which = fall below=20 36 m yr-1), the concentration of nutrients in groundwater is usually = higher than=20 in riverwater and seawater, leading to significant nutrient fluxes. = However, the=20 chemical composition of SGD is not only affected by the landward = sources, but=20 also by the biogeochemical processes in the mixing zone of freshwater = and=20 seawater. In this study, we use a 2D density-dependent reactive = transport model=20 to simulate the water flow and biogeochemical processes affecting = nitrogen (N)=20 and phosphorus (P) in a coastal aquifer with a typical = freshwater/seawater wedge=20 (Ghyben-Herzberg interface). We focus on assessing the role of = differences in=20 flow regime and redox conditions on the fate of dissolved NO3-, NH4+ and = PO4 in=20 subterranean estuaries. Four types of redox conditions are considered: = i) oxic=20 groundwater meeting oxic seawater, ii) oxic groundwater meeting anoxic = seawater,=20 iii) anoxic groundwater meeting oxic seawater and iv) anoxic groundwater = meeting=20 anoxic seawater. In our simulations, we assume that the fresh = groundwater is=20 contaminated with NO3- and PO4 originating from sewage effluents or = agricultural=20 activity along the coast. Anoxic seawater is typical for many coastal = sediments=20 because of input of reactive organic matter from the water column. The = key=20 processes included in the model that involve nutrients are = nitrification,=20 denitrification, P removal through authigenic mineral formation (e.g. = authigenic=20 calcium-phosphate minerals) and sorption onto Fe-oxides. Sensitivity = analyses=20 demonstrate the key role of both the flow regime and redox conditions in = determining nutrient fluxes and N:P ratios in SGD. In most scenarios, = SGD is=20 characterized by N:P ratios above the Redfield ratio of 16.


Intrusion Barriers


Johnson TA, Sim Y
Injection Wells To Halt = Saltwater=20 Intrusion

Decades of groundwater overdraft from the coastal aquifers of the = Central and=20 West Coast groundwater basins in Los Angeles County, California, caused=20 potentiometric elevations to fall below sea level, resulting in = saltwater=20 intrusion that contaminated water wells and threatened the future = usability of=20 the basins. To halt the intrusion, an extensive network of injection and = monitoring wells were constructed by the Los Angeles County Flood = Control=20 District (County) who has operated the wells for the past 50 years. = There are=20 three barrier well projects: 1) The West Coast Basin Barrier Project is = a 15 km=20 stretch of 153 injection wells and 276 monitoring wells that reach = depths of 213=20 m; 2) The Dominguez Gap Barrier Project is a 10 km stretch of 94 = injection wells=20 and 232 monitoring wells that reach depths of 140 m; and 3) The Alamitos = Barrier=20 Project is a 3.5 km stretch of 43 injection wells and 239 monitoring = wells that=20 reach depths of 137 m. The wells continuously inject water at rates of = 0.1 cfs=20 to 0.45 cfs each into the confined aquifers to increase the = potentiometric=20 elevations at internodal monitoring wells to attempt to prevent the = intrusion.=20 The injection water then flows inland, replenishing the aquifers with = fresh=20 water that is later pumped out for potable and industrial use. The Water = Replenishment District of Southern California (WRD) purchases the water = for=20 injection. In 2004-2005, WRD has estimated that 44,652,043 cubic meters = of water=20 will be injected into the barriers at a cost of $17.4 million. From the = 1950s to=20 mid 1990s, only treated, potable water was used for injection. Since = then,=20 highly treated (reverse osmosis) recycled water has replaced some of the = potable=20 water. Currently, about half of the injected water is potable and the = other half=20 recycled. Chloride samples and water elevations are regularly collected = from=20 monitoring wells by the County to assess the effectiveness of the = injection=20 wells. If leaks past the barrier are detected, injection rates for the = nearby=20 wells are increased. If necessary, additional injection wells have been=20 installed in-between the existing injection wells or as an extension of = the=20 existing stretch of the wells. This system has worked very well to = protect the=20 coastal aquifers from saltwater intrusion, but at a high cost. = Alternative=20 methods to barrier injection wells, such as reduced pumping, = low-permeability=20 cutoff walls, or inert gasses, are continually evaluated.

Labreg=E8re D, Delhomme JP, Priestley = A
Mitigating Salt=20 Water Advance Using Horizontal Wells:Risk Based Comparison Of Different=20 Approaches

Many coastal regions in the world experience an intensive salt water=20 intrusion in aquifers due to natural and anthropogenic causes. Seawater=20 intrusion is highly dependent on coastal geology (depositional channels, = presence of fractures, etc=85). A good geological characterization must = be=20 undertaken to better understand the specific intrusion phenomenon and = then=20 select the best approach for remediation. A number of techniques such as = fresh=20 water injection or salt water extraction can be used to prevent or = retard the=20 salinization process. With either technique, drilling horizontal wells = can bring=20 significant benefits as compared to vertical wells. They can be drilled = with=20 smaller surface footprints, and can allow extracting or injecting = significantly=20 larger volumes of water as compared to conventional vertical wells. The = first=20 part of the study consists in simulating horizontal wells performance = compared=20 to vertical wells barriers in a homogeneous media. The type of = remediation=20 technique to be used and its design will vary according to the aquifer=20 characteristics that are unfortunately unknown. In the second part of = this work=20 we perform a risk analysis to reduce this uncertainty and select the = best=20 approach. Seawater intrusion is simulated in three dimensions using a=20 methodology based on Monte Carlo analysis. The basic steps are: first, a = geostatistical model is selected to simulate a number of heterogeneous = hydraulic=20 conductivity fields consistent with this model; second, seawater = intrusion=20 steady state is solved for each heterogeneous field; third, transient=20 simulations of the fresh water injection and the salt water extraction = using=20 horizontal wells are performed for each heterogeneous field. Lastly, the = set of=20 simulation produced for each remediation technique is analyzed and the=20 associated risks with are compared. Fresh water injection and salt water = extraction with horizontal wells can be combined in an integrated way. = For=20 instance, the extracted salt water can be desalinated, used by the = population,=20 and treated used water can be re-injected, the aquifer acting as a = buffering=20 zone. In summary, with proper aquifer characterization, modeling and = monitoring=20 during wells design, installation and exploitation phases, choices about = remediation measures can be made based on risk analysis. Horizontal = wells can be=20 contribute to the remediation process with increased efficiency and = reduced=20 costs.

Fordham E, Watt D, Johnson T, Weeks J, Gularte F, Barneich J, = Burton=20 J
Seawater Barrier Demonstration Project Using A = Physical Deep=20 Soil Mix Wall

The US Bureau of Reclamation in conjunction with the Water = Replenishment=20 District of Southern California has promoted and financed a = demonstration=20 project involving the use of deep soil mixing in the construction of a = physical=20 cutoff wall to limit landward intrusion of seawater. The project site is = located=20 in the Alamitos Gap between Seal Beach and Long Beach, California, USA. = Seawater=20 intrusion occurs through the gap within a shallow aquifer that is less = than 30=20 meters deep and communicates with water supply aquifers further inland. = The=20 physical cutoff wall concept calls for a soil-mix wall constructed into = the=20 aquitard that underlies the aquifer and spans the 3.5-kilometer length = of the=20 gap. The demonstration project's primary objectives were to prove the=20 feasibility of constructing a deep soil-mix wall and to evaluate the = wall's=20 effectiveness at limiting intrusion. Key elements of the demonstration = project=20 included 1) careful hydrogeologic evaluation of the selected site to=20 characterize aquifer and aquitard intervals, 2) rigorous laboratory = testing of=20 site sediments to determine an optimum mixture of soil, slag, cement and = clay,=20 3) application of the Trench Remixing and Deep wall method (TRD) to = construct=20 demonstration test cells, and 4) field testing prior to and following = test cell=20 construction to demonstrate the effectiveness of the soil-mix wall. TRD = machines=20 have been used extensively in Japan where this technology was developed. = The=20 Alamitos Gap demonstration project was the first application of this = technology=20 for seawater intrusion in the United States. During design, = hydrogeologic=20 evaluation indicated variability in the aquitard beneath the shallow = aquifer;=20 therefore, two test cells each 8 meters square and completed to depths = of 20 and=20 24 meters were utilized to assess potential underflow to wall depth. = Testing of=20 5 different soil-mixes indicated the addition of slag, cement and = sepiolite at=20 specific percentages as optimal for field application in order to = achieve a wall=20 permeability of 1x10-6 cm/sec or less. Use of the TRD method to = construct the=20 test cells proved effective at producing a homogeneous, low-permeability = soil-mix wall to a depth of 24 meters. The resulting permeability of the = wall as=20 demonstrated by laboratory and field tests was less than 1x10-6 cm/sec. = During=20 testing, seepage that entered the test cells was shown to be = predominantly from=20 beneath the test cells through the underlying aquitard sediments. The = deeper=20 test cell was more effective at cutting off the underflow.

Abarca E, Carrera J, Vazquez-Sune E
Hydraulic = Efficiency=20 Assessment And Optimal Design Of Correctives Measures To Reverse = Seawater=20 Intrusion In The Llobregat Delta Aquifers, Barcelona, = Spain

Freshwater injection to create seawater intrusion barriers is often=20 considered a waste of resources. It is generally believed that most of = the=20 injected water flows seawards and, thereby, it is lost. However, we = present here=20 a field case that contradicts this extended belief. The main aquifer of = the=20 Llobregat delta suffers a severe seawater intrusion problem. Water = authorities=20 have sought advice to optimally design corrective measures that allow = both=20 maintaining the current pumping regime and restoring the water quality = of the=20 aquifer. To address this issue we determine the hydraulic efficiency of=20 different corrective measures. This hydraulic efficiency is computed by = the=20 shadow prices obtained using a linear programming optimization method = that=20 constrains heads at several control points. In the case of the = freshwater=20 injection barrier this efficiency is higher than one, which implies that = by=20 injecting water near the shore, not only can we recover the amount of = water that=20 has been injected but extract even more resources. This result reflects = that, in=20 this case, the protective effect of the barrier is as relevant or more = than the=20 sole increase of available water caused by injection. Once the = efficiency is=20 determined, a non-linear optimization method is used to design the = optimal=20 injection regime to restore the water quality of the aquifer. Chloride=20 concentration constrains are used in this case to determine the optimal=20 injection rate in the studied corrective measures.

Larabi A, Aharmouch A, Cheng A.H-D
Mathematical = Model=20 For Seawater Intrusion In The Coastal Aquifers Using = Saturated/Unsaturated Flow=20 Formalism

Coastal aquifers are often heavily stressed by the overexploitation = of=20 groundwater. As a consequence, seawater can invade the freshwater zones = and=20 degrade groundwater quality. To design an appropriate management = strategy for=20 these vulnerable areas, the location of the freshwater-saltwater = interface needs=20 to be predicted. A numerical procedure is developed for solving this = problem in=20 steady conditions using the Galerkin finite element technique. The = innovative=20 approach of this paper is to use the saturated/unsaturated flow = formalism to=20 model the saltwater region as an unsaturated one. Using the relative=20 permeability concept, the flow in the saltwater region is effectively = reduced to=20 zero, satisfying the Ghyben-Herzberg assumption. This technique avoids = the need=20 of a moving mesh to model two distinctive zones, and a fixed finite = element mesh=20 can be used. Benchmark tests involving confined and phreatic coastal = aquifers=20 are studied to validate the present approach. The model is also applied = to the=20 coastal aquifer of Sous Chtouka in Morocco to simulate saltwater = intrusion. The=20 Sous Chtouka plains, with a total area of about 3950 km2, are part of = the=20 Moroccan coastal plains which is located to the east of Atlantic Ocean = in the=20 south of Morocco. The area is characterized with heavy agricultural and = tourist=20 activities and it is considered a densely populated area around the = large city=20 of Agadir. Groundwater in the area is used to supply agricultural and = domestic=20 purposes. In the area the groundwater level dropped between 1-3 m/year, = if this=20 over-exploitation continues without better management the seawater = intrusion=20 will deteriorate the groundwater quality with increase of salinity. = There exist=20 a potential for water resources (more than 20 Mm3/yr for a population = more than=20 2.5 M) that could be reused after pre-treatment by plants to contribute = in=20 compensating the water budget deficit. The sand dune sites which are = located in=20 the coastal area, south of the Agadir city, offer potential sites for = artificial=20 recharge in the framework of regional water resources development. For = this=20 purpose, the mathematical model described previously has been applied to = study=20 groundwater flow and salt water intrusion in this aquifer. Different = management=20 scenarios have been simulated to provide the managers with a prediction = tool=20 that could help in decision making for quantitative and qualitative = groundwater=20 management in this groundwater system. Acknowledgements: The work = reported=20 herein is supported by the U.S. National Science Foundation grant = OISE-0422868=20 "Optimal groundwater models for sustainable management of coastal=20 aquifers.".

Barcelona MJ, Moonkoo K, Masciopinto C, La Mantia = R
A=20 Gypsum-Barrier Design To Stop Seawater Intrusion In A Fractured Aquifer = At=20 Salento (Southern Italy): Preliminary Results

Seawater intrusion into fresh water aquifers occurs in many coastal=20 hydrogeologic settings due to overexploitation of freshwater resources. = This can=20 render the ground water unfit for potable or agricultural use without = extensive=20 treatment. It can be exacerbated by seawater level increases as a result = of=20 climate change on which there is wide consensus in the scientific = community=20 (Oreskes, 2004; Framing Committee of the GWSP, 2004). Basin scale = water-balance=20 deficits may be used together with hydrogeologic modelling and water = quality=20 monitoring data to track the advance of seawater intrusion (EEA, 1996). = Due to=20 the growth of population and increased exploitation of the ground-water=20 resources in coastal areas the problem is truly global in proportion. = The=20 situation is particularly acute in the Mediterranean, the Yucatan = peninsula in=20 Mexico, the Middle East, the SE and SW United States as well as on many = islands=20 with arid to semi-arid climates. (Barlow and Wild, 2002; SWICA2, 2003).=20 Continued exploitation of limited freshwater resources can also lead to = up-flow=20 of relict marine waters underlying the fresh water zone compounding the = effects=20 of seawater intrusion. The proposed studies has been designed to test = the=20 feasibility of creating a subsurface barrier to seawater intrusion by = induced=20 gypsum precipitation in fractured carbonate aquifers. The primary goals = of the=20 work are to integrate field and laboratory results on aquifer = characterization=20 and gypsum precipitation kinetics with a one-dimensional reactive = transport=20 model nested in a recently developed three-dimensional groundwater flow = model of=20 a fractured coastal aquifer (Masciopinto, 2006). The project will = requires at=20 first step the laboratory analytical characterization of ground water = and=20 geochemistry (mineralogy, elemental composition, ion-exchange and = sorptive=20 properties towards environmentally safe precipitation inhibitors); = determination=20 of the location of the 50% salinity contour within the Nard=F2 coastal = aquifer=20 (Southern Italy) and the zone of influence of an injection of the gypsum = solution on the basis of model simulations; and execution of bench pilot = scale=20 injection experiments on gypsum precipitation in the established = fractured rock=20 test facilities of the CNR-IRSA in Bari, Italy. The proposed work = represents the=20 necessary initial steps to confront the problem of seawater intrusion = into=20 fractured aquifers by emplacement of a barrier by induced mineral = precipitation.=20 The results of the work will assist regional, national, and local water=20 management interests to better regulate water use and protection as well = as to=20 avoid conflicts over scarce resources.

Wu J
The Coastal Underground Reservoir = Constructed for=20 controlling the Seawater Intrusion in Longkou City, Shangdong Province,=20 China

Seawater intrusion was observed in China's coastal aquifers as early = as the=20 1960s. At present, it covers an area of more than 2000 km2 in China. In = 2002,=20 the seawater intrusion area was increased to 1773.6 km2 in Shangdong = Province,=20 China, and it is continuing to extend in the coastal area of Laizhou = Bay. In=20 order to study the characteristic of the seawater intrusion and the = pattern of=20 the saltwater/freshwater interface, we set the China's first = three-dimensional=20 seawater intrusion observation network in Longkou City of Shangdong = Province in=20 1989. The data obtained for six consecutive years show that there is = usually a=20 wide transition zone in the study area, but in some regions, a = relatively=20 distinct and sharp interface is formed. Seawater intrusion was caused by = the=20 excessive pumping of the groundwater from the coastal aquifer. The = interface was=20 generally formed on the inland side not far away from the powerful = discharge=20 pumping center, and seawater intrusion stops there. The monitoring data=20 suggested that, if the powerful discharge pumping center moves landward, = the=20 saltwater will start advancing landward until a new equilibrium is = reached, and=20 even if a new pumping well, whose discharge is very small, is drilled, = the=20 equilibrium would be upset, thus causing the interface to advance inland = slowly.=20 The observation data also show that, from 1984 to1994, the seawater = intrusion=20 area was increased from 64.5 km2 to 103.0 km2 in Longkou City, Shangdong = Province. In order to control the development of the seawater intrusion, = in=20 1995, a continuous underground concrete wall, by the method of = high-pressure jet=20 grouting, was constructed in the downstream plain area of the = Huangshuihe River=20 in Longkou City. The average depth of the 5842 m long concrete wall is = 26.7 m,=20 and the maxim depth is 41 m. It forms a coastal underground reservoir = with the=20 total storage capacity of about 5359X104 m3. In the past 10 years, the = reservoir=20 obtained great economic benefit, social benefit and ecosystem benefit. = Keywords:=20 Seawater intrusion, the coastal underground reservoir, the concrete=20 wall.


Geophysics


Goldman M, Toledano Avivi O, Friedman = V
Delineating=20 Fresh-Saline Water Interface Within The Mediterranean Coastal Aquifer Of = Israel=20 Using Combined 2-D Resistivity Imaging And Tdem = Measurements

Time domain electromagnetic (TDEM) method became a leading = geophysical=20 technique for detecting and monitoring seawater intrusion into coastal = aquifers=20 of Israel and of many other countries around the world. The method has = replaced=20 traditional resistivity soundings (VES) due to its superior accuracy and = reliability of the interpretation. However, the successful application = of TDEM=20 is very limited in urban areas because of a high sensitivity to ambient = EM noise=20 and due to the necessity of using relatively large infrastructures free = areas to=20 lay down the transmitting antenna. Contrary to TDEM, resistivity = soundings are=20 carried out along straight lines (e.g. streets or roads) and are = practically=20 insensitive to most kinds of EM noise. To overcome the above mentioned=20 limitations of TDEM, an attempt has been made to supplement TDEM by 2-D=20 resistivity imaging measurements in those areas, where the application = of TDEM=20 alone is virtually impossible. To calibrate the resistivity = measurements,=20 several lines have been run near existing observation wells first. All=20 calibration measurements detected a very low resistivity layer in the = bottom of=20 the interpreted resistivity cross-section, which was identified with = seawater=20 intrusion. However, in some cases the intrusion was located = significantly deeper=20 than that detected in the well and by TDEM. Analysis shows that this = problem was=20 caused by a non-uniqueness of the inversion (equivalence problem). The = specific=20 smoothness constraint algorithm used in the inversion further = complicated the=20 problem. At one location, 2-D resistivity imaging allowed to resolve a = problem=20 in the TDEM interpretation caused by the appearance of very conductive=20 multidimensional features in the subsurface.

Pezard PA, Gouze1 P, Leprovost R, Henry G, Deltombe GL, Legros=20 B
The Aliance Project (Ii): New Hydrogeophysical Sensors = For The=20 Investigation And Monitoring Of Salt Water Intrusion

The ALIANCE european research program ended in 2005, after four years = of=20 research aimed at improving the hydrogeophysical investigation, = characterisation=20 and monitoring of coastal aquifers for vulnerability assessment. ALIANCE = has=20 developed a set of geophysical approaches for the quantitative = evaluation of=20 brine intrusion and test them in two end-member sites in terms of=20 hydrogeological behaviour. This includes state-of-the-art geological,=20 geochemical, petrophysical, logging and hydrological methods, and the = design of=20 new geophysical and hydrodynamical logging/testing and monitoring = sensors=20 yielding new data for model validation. The new downhole = hydrogeophysical=20 sensors include new sources for hydrodynamical in-situ testing, and new = borehole=20 geophysical tools for crosshole experiments. Examples of these new tools = are the=20 "Controlled Fluid Injection System" (CoFIS) for controlled fluid = injection in=20 terms of either pressure, flow rate, fluorescine content or salinity, or = the=20 "MUlti Sensor Electrical Tool " (MuSET) for measurement of downhole = electrical=20 spontaneous potential (SP) in conjunction with fluid pressure, = temperature, pH=20 and electrical conductivity. These tools have been tested in 2005 at the = new=20 experimental sites developped within ALIANCE. Active in-situ testing = from short=20 and longer-term injections with variable salinity fluids to simulate=20 overdrafting or saline water intrusion has been conducted. The = electro-hydraulic=20 coupling principle has also been used to characterise and monitor = water/brine=20 hydrodynamics in the subsurface. A new downhole method for long-term = monitoring=20 and brine intrusion prevention has also been developped and tested with = success=20 in the field. The principle of the observatory called "igeoSER" is based = on the=20 electrical probing of the subsurface. It was first deployed in june 2004 = and is=20 functioning still. Present developments in this domain include the=20 automatisation of this permanent and autonomous observatory designed to = produce=20 a daily measurement over periods of several years. The objective is to = place=20 such an observatory at the center of a retroactive loop for decision = making=20 applied to water abstraction in coastal aquifers.

Boutaleb S, Bouchaou L
Contribution Of The = Electrical=20 Prospecting To Optimize The Choice Of The Must Favorable Sites For = Drilling In=20 Coastal Alluvial Zone

The research of the drilling sites for the exploitation in the = coastal=20 aquifers requires the development of the electrical survey study to = avoid the=20 marine invasion. The electrical prospecting methodology can provide a = wealth of=20 data that not only can define the subsurface architecture of aquifers, = but also=20 can delimit the position of saltwater and the resistive characteristics = of the=20 subsurface geology. The alluvial groundwater of Ksar Esghir in the = border of=20 mediteranen sea presents in this respect an exemplary case. The results = of the=20 applied study show several families of electrical surveys. The results = of all=20 soundings were combined and plotted as geo-electric cross-sections. The=20 transversal resistivity map shows favorable areas characterized by high = values.=20 In the north part of the area, the geoelectrical levels are invaded by = sea=20 water, what contributed to limit invaded marine water. Two limits are = charted=20 making it possible to locate the invaded zone and that of mixture = respectively.=20 Some electrically favorable areas are proposed for futur drillings. This = study=20 made it possible to show reliability of the electrical survey = prospecting for=20 delimitation saltwater of marine invasion in the coastal aquifers.

Trabelsi F, Ben Mammou A, Tarhouni J, Piga C, Ranieri G=20
Salt Water Intrusion Characterisation In The Coastal = Aquifer Of=20 Nabeul Hammamet (Ne Tunisia) Using Advanced Geophysical = Methods

In this purposed work a set of advancing in hydrogeological studies = is=20 presented and applied to the case of the Nabeul Hammamet coastal aquifer = located=20 in northeastern of Tunisia (Cap Bon). The aquifer system of Nabeul = Hammamet=20 plays a strategic role for planning the management of regional = hydrologic=20 resources; it is very threatened by saltwater intrusion and pollution = due to=20 agricultural and touristic activities. Indeed, face to the increase of = the water=20 demand both for agricultural and water supply was resulted in = overexploitation=20 of groundwater, and a continual decrease in piezometric level. The = Nabeul=20 Hammamet area is characterized by a complex geological structure, and a=20 heterogeneous aquifer system, and is considered multi-layered. It is = composed by=20 an unconfined alluvial aquifer and a confined one constituted by sands,=20 overlaying low-permeability sandy clays. In order to better characterize = the=20 geometry of this system and the interface between the salt water and the = freshwater, geophysical survey was been accomplished using several = methods. Time=20 Domain Electro Magnetic (TDEM) method is the leading geophysical = technique in=20 the exploration of groundwater was chosen for investigating the = subsurface=20 geology and hydrogeology over the course following similar = investigations in=20 coastal margins. This method permit to distinguish the contrast in = electrical=20 properties between the target formations of unconsolidated sands and=20 consolidated siltstones, coals and sandstones were anticipated to be = high.=20 Furthermore, the electrical contrast between freshwater saturated ground = and=20 saltwater saturated ground could be also characterized. Also, a basic = TDEM=20 survey is applied to clarify some of the features of the intrusion = phenomenon.=20 The TDEM technique presents the advantage to cover the whole aquifer = with a set=20 of many soundings, and thus it seems to be suited for the sea water = intrusion=20 phenomenon in the case of under shallow aquifer as in owner case study. = The=20 light TEM-FAST 48 HPC instrument is used with 50 and 100 m square loops = in the=20 one-loop configuration. The results allowed us to reconstruct the = behavior of=20 the clay substratum as well as the geometry of the salt wedge in the = aquifer.=20 Resistivity Maps at different levels were carried out in order to = distinguish=20 the water paths into different layers. A set of integrated well logs = (lithology,=20 permeability, conductivity, etc.) were carried out in the previous = piezometric=20 wells. The results of these studies gave the details of the lithology = inside the=20 aquifer which is prevalently sandy, but characterized by different = permeability=20 levels, due to intercalations of clay levels. A geophysical survey and=20 hydrological modelling exercise was conducted on a local links course to = determine the extent of groundwater supply and the groundwater = vulnerability to=20 contamination by saltwater intrusion. The geophysical survey = successfully mapped=20 the freshwater-saltwater boundary and modelling results confirmed = existing=20 extraction strategies based on current climatic conditions and = irrigation=20 demands. A number of pumping scenarios were constructed based on the = results of=20 the survey for future water use planning during times of drought and = heavy=20 extraction. The methodologies employed in this study can be built into = course=20 management strategies where decisions on sighting new irrigation wells = and=20 defining future pumping regimes requires predictive capabilities of the = aquifer=20 and the subsurface geology.

Antonsson A, Engesgaard P, Kemna A, Nguyen F
A = Synthetic=20 Study On Constraining A 2d Density Dependent Saltwater Intrusion Model = Using=20 Time-Lapse Electrical Resistivity Data

In groundwater model development, calibration is one of the critical = aspects=20 that determine its reliability and applicability in terms of e.g. system = (hydrogeological) understanding, groundwater quality predictions, and = general=20 use in water resources context. The result of a groundwater model = calibration is=20 determined by different factors, where both data quantity and quality is = of=20 crucial importance. Typically the availability of conventional = monitoring=20 installations (e.g. depth specific monitoring wells for salinity = measurements)=20 and the cost of constructing new ones limit the amount of obtainable = data. These=20 factors can seriously hinder a successful monitoring strategy and = consequently=20 limit the reliability of the calibrated model. An effective alternative = to=20 conventional measurements is the use of geophysical methods to monitor = changes=20 in the subsurface e.g. salinity distribution. If applied in a time-lapse = manner,=20 electrical images give both spatial and temporal information on the = salinity=20 distribution compared to conventional methods, which only give (few) = point=20 information. The aim of this study was therefore to investigate the=20 applicability of using time-lapse electrical images to calibrate a = synthetic=20 seawater intrusion model. A vertical 2D density-dependent flow and = transport=20 model was established for a synthetic coastal aquifer in order to = simulate=20 saltwater intrusion. All the relevant hydraulic parameters applied in = the model=20 were given realistic values. The result of the synthetic model, = basically a=20 salinity distribution in the coastal aquifer (the classical salt water = wedge),=20 was converted to resistivity distribution by assuming a certain = petrophysical=20 relation between water salinity and electrical conductivity. The = obtained=20 resistivity distribution was then used when time-lapse electrical data=20 acquisition was simulated, with different array configurations. By = applying an=20 advanced inversion approach, time-lapse electrical images were obtained = and=20 based on the assumed petrophysical model the salinity distribution was = derived.=20 A number of synthetic flow and transport simulations, with different = hydraulic=20 parameter values, were conducted in order to assess the applicability of = the=20 method under diverse hydraulic conditions. The synthetic model was then=20 calibrated against the newly (electrical resistivity) derived salinity=20 distribution. The result of the calibration i.e. the obtained hydraulic=20 parameter values and the comparison with the original parameter values,=20 illustrate the applicability of using time-lapse electrical data for = calibration=20 of seawater intrusion models. The results of this synthetic study = demonstrated=20 some of the (potential) benefits of applying the electrical imaging data = for=20 calibration of seawater intrusion models. Furthermore, it also shows = some of the=20 limits this method has as well as the associated uncertainties.

Comte JC, Banton O
Modelling Of Seawater = Intrusions In=20 The Magdalen Islands (Qu=E9bec, Canada)

Seawater intrusion is the major risk of groundwater degradation in = coastal=20 regions, often densely populated and strongly dependent on groundwater. = To=20 preserve sustainability and quality of the resource, mathematical = modelling of=20 the equilibrium between continental freshwater and marine saltwater = appears like=20 a powerful tool of management. However, model quality mainly depends on = the=20 previous characterisation of the hydrogeological environment. For this = purpose,=20 Direct Current (DC) resistivity imaging constitutes a relevant = geophysical=20 method because it provides precious information on both the geological = structure=20 and the freshwater/saltwater interface at a given time. These = information are of=20 great importance for parametrization and calibration of = density-dependent flow=20 models. Magdalen Islands archipelago is a typical exemple of an insular = region=20 completely dependent on groundwater everywhere vulnerable to seawater = intrusion.=20 Potable water supply of the 13 000 inhabitants exclusively comes from = the=20 Permian sandstone formations which are very productive (transmissivities = of=20 about 3.10-3 m2/s allowing pumping rates of several tens of L/s). DC = profilings=20 have been carried out on archipelago, with a more densely cover near the = main=20 pumping wells. Geophysical measurements were realised with an ABEM Lund = system.=20 Acquired raw data have been first inverted with the software RES2DINV = and=20 secondly forward modelled with RES2DMOD. Density driven flows = mathematical=20 modelling has been developed with the software SUTRA. Correlation = between=20 electrical resistivities (geophysical values) and chloride = concentrations=20 (modelled values) was established from the combination of Archie's Law = and=20 empirical relationships based on hydrogeochemical regional data. Model = building=20 and calibration allowed reconstituting the main features of the = interface and/or=20 saltwater intrusions imaged by geophysics in the different cases of (1) = absence=20 of withdrawal, (2) diffuse withdrawals and (3) localised high-rate = pumping=20 wells. These results display the relevancy of using together resistivity = imaging=20 and hydrogeological modelling. Each method allows both validation and=20 interpretation of results obtained by the other method. With such a=20 cross-validation between modelling and geophysics interpretations, = different=20 pumping scenarios can be tested and bring to the elaboration of a = sustainable=20 management of groundwater in terms of applied pumping rates and = withdrawals=20 spatial distribution.

Kemna A, Nguyen F, Antonsson A, Engesgaard P, Tsourlos=20 P
Characterization Of Saltwater Intrusion Using = Electrical=20 Imaging: A Numerical Simulation Study

The understanding of subsurface seawater intrusion dynamics is an = important=20 requirement for the sustainable management of water resources in coastal = areas=20 such as the Mediterranean circumference. Seawater intrusion dynamics is = strongly=20 dependent on the mixing processes between saltwater and freshwater and = the given=20 hydrogeological and geochemical conditions (e.g., hydraulic properties,=20 freshwater recharge, salinity differences). Therefore, it often involves = high=20 spatio-temporal variability and, as a consequence, is extremely = difficult to be=20 characterized using conventional measurement techniques such as local = water=20 sampling in monitoring wells. In particular electrical imaging has = proven to be=20 an efficient non- to minimally invasive tool to characterize subsurface=20 hydrogeological structures, for example in terms of lithological = boundaries, as=20 well as to monitor water salinity changes with relatively high spatial=20 resolution. However, interpretation of electrical signatures in this = context is=20 complicated by the overlapping effects due to variations in lithology = and=20 salinity, making for instance the discrimination between aquitard and = aquifer=20 material at high salinities difficult. We here investigate the potential = of=20 electrical imaging for the characterization of saltwater intrusion in a=20 numerical (two-dimensional) simulation study, where density-dependent = flow and=20 transport is modelled for a typical hydrogeological setting. Tomographic = acquisition of time-lapse electrical data is simulated employing surface = and=20 borehole electrode arrays, and assuming petrophysical relations between = water=20 salinity and electrical conductivity for different lithological units. = In a=20 static approach, the ability of electrical imaging is studied to = reconstruct the=20 spatial electrical conductivity variations associated with both = lithology and=20 the salinity distribution corresponding to a steady state scenario for a = given=20 set of boundary and initial hydrological conditions. By changing the = boundary=20 conditions according to variations which might occur, for instance on a = seasonal=20 scale, a dynamic scenario is simulated. This scenario is used to = investigate the=20 ability of time-lapse electrical imaging to characterize the dynamics in = the=20 saline intrusion process. The different investigated scenarios = demonstrate the=20 potential of the method for saltwater intrusion characterization, but = also show=20 its limitations, for example regarding resolution at depth and for given = uncertainty in the underlying petrophysical models. However, with an = appropriate=20 survey design, it seems practical that information obtained from both = static and=20 time-lapse electrical imaging results can be used to constrain the = hydrological=20 model describing the saline intrusion process, as is demonstrated in an=20 accompanying paper (Antonsson et al.). This is of importance for = improved model=20 predictions which might contribute to the sustainable management of = water=20 resources in coastal regions.






POSTERS

  • Geochemistry=20 |=20
  • Modeling:=20 Case Studies |=20
  • Modeling:=20 Techniques |=20
  • Intrusion=20 in Sedimentary Aquifers



Geochemistry


Carreira PM, Galego Fernandes P, Nunes D, Silva=20 MO
Groundwater radiocarbon dating, Tool to distinguish=20 salinization origins in the Lower Tagus - Lower Sado Atlantic coastal = system =96=20 Portugal

Located in the SW of Portuguese Atlantic coast line the Lower Tagus = =96 Lower=20 Sado sedimentary basin, Set=FAbal-Lisbon region, represents an important = water=20 resource for a vast region which has been extensively exploited over the = last=20 decades. Nowadays, the national water authorities have a growing concern = that=20 the groundwater systems maybe threatened by further exploitation (not=20 controlled) due to mixing with the shallow aquifers (highly polluted), = seawater=20 intrusion processes in the coastal areas, or either by brine dissolution = detected in depth by geophysical studies (ASTIER, 1979). In order to = find out=20 the source of salinization in the groundwater systems isotopic = (2H, 13C, 18O,=20 3H and 14C) and chemical analyses (Cl-, HCO3-, SO42-, Ca2+, Mg2+, Na+ = and K+)=20 were performed on groundwater samples collected in 39 boreholes. The = Lower Tagus=20 =96 Lower Sado Basin is characterized by a synclinal structure composed = by=20 Tertiary sediments, mainly marine deposits. Three main groundwater = systems were=20 identified in the region: a shallow quaternary aquifer constituted by = alluvial=20 deposits, underlie by the Pliocene and Miocene formations. Marine = sandstones and=20 limestones related with different marine transgression and regression = events=20 compose the Miocene deposits. These deposits show an average thickness = around=20 200 to 300 m; however in the central part of the basin can reach the 800 = m=20 (PIMENTEL, 1997). The Pliocene layers are represented by fluvial = terraces made=20 of sands and clays. Two important fault systems were revealed through a=20 geophysical survey. The first located in the Lower Tagus valley with a = N30=BAE=20 direction, and the other the so-called Set=FAbal - Pinhal Novo fault = runs N-S and=20 is responsible for a graben structure which allows the rising of a brine = formation or ancient seawater trapped in the sediments (ASTIER, 1979 ). = A=20 progressive increase in the total dissolved solids (TDS) is observed in = both=20 aquifer systems: in the Pliocene the TDS varies from 80 mgL-1 up to 2565 = mgL-1,=20 while in the Miocene the mineralization varies between 200 mgL-1 to 7800 = mgL-1.=20 Two different hydrochemical trends were recognized in the ratio Ca/Na: = the first=20 reflects seawater mixing and the other with higher Ca content = characterizes most=20 probably the brine dissolution. Also in the central part of the basin, = an=20 increase of the water salinization was detected. This increase in Cl- = and Na+ in=20 the groundwater mineralization is most probably associated with the = graben=20 structure, responsible for the rising of the brine to minor depths = Radiocarbon=20 was determined in 12 boreholes on the Total Dissolved Inorganic Carbon = (TDIC).=20 The range of values varies from 71.9 =B1 0.7 pmc to 88 =B1 0.8 pmc in = the Pliocene,=20 and from 2.9 =B1 0.3 pmc to 45.6 =B1 0.9 pmc in the Miocene. The = apparent carbon-14=20 groundwater age was estimated using 13C values as correction = factor. Apparent=20 ages obtained vary between modern (sea water intrusion) and 25.4 =B1 3.3 = ka (brine=20 dissolution). The links between the apparent carbon-14 groundwater age = and the=20 electrical conductivity or even the Cl- content show an increase of = salinization=20 with the apparent groundwater age. The observed trend points to brine=20 dissolution mechanism (southern part of the basin) as the main process = for the=20 water quality deterioration. Nevertheless, a different salt origin in = the=20 groundwater system was identified in Almada region (northern part of the = basin):=20 the results are pointing to recent seawater intrusion as the main = mechanism=20 responsible for the salts increase in the groundwater.

Sanz E, Ayora C, Carrera J
Experimental evidence = of=20 calcite dissolution by mixing of calcite-saturated waters: preliminary=20 results

It is deduced from modelling that the mixing of carbonate solutions = which are=20 both saturated with respect to calcite can lead to either undersaturated = or=20 supersaturated conditions depending of the type and proportion of the = end-member=20 solutions mixed. These aspects of mixing are of considerable importance = in=20 predicting diagenetic processes in carbonate rocks, such as carbonate=20 dissolution in seawater intrusion. However, these predictions have not = been=20 clearly validated by experiments. We present the results of a set of = laboratory=20 experiments demonstrating the dissolution of calcite by mixtures of=20 calcite-saturated waters of different salinities and CO2 partial = pressures at=20 25=BAC. Experiments are performed at different mixing proportions = allowing the=20 establishment of the dependency of calcite near-equilibrium dissolution = rate=20 with the saturation index.

Mendizabal I, Stuyfzand PJ
Trace element = concentrations=20 of groundwater pumped for drinking water supply, and their relation with = marine=20 depositional sedimentary environments of the aquifer and = postdepositional=20 salinity changes

Various well fields in the Netherlands pump groundwater for drinking = water=20 supply, with elevated concentrations of trace elements, notably Al, As, = B, Ba,=20 Br, Co, Cu, F, I, Li, Ni, Sr and Zn, some of which are close to or = exceeding=20 drinking water standards. In this contribution a method is presented to=20 determine whether these high concentrations are due to (a) anthropogenic = pollution sources or (b) unusual natural backgrounds associated with = specific=20 aquifers or palaeohydrological settings, in particular regarding ancient = marine=20 depositional environments or marine transgressions. Anomalous natural=20 backgrounds associated with such marine conditions are considered of = general=20 interest to inventories required by the European Water Framework = Directive. With=20 a Geographical Information System maps of the Netherlands were = constructed and=20 compared, showing the current spatial distribution of all relevant trace = elements, tritium and main constituents on the one hand, and the = depositional=20 sedimentary environment of the pumped aquifers and postdepositional = salinity=20 changes as inferred from the geological record, on the other hand. = Recent data=20 on F and I are compared with data obtained in the 1930s, when all active = well=20 fields were analyzed for a national correlation with the waterborne = diseases=20 fluorosis and struma. The latter was endemic in the Netherlands at that = time.=20 From the trace elements studied, especially B, F, I and Sr clearly = display a=20 positive relation with a marine sedimentary environment of the pumped = aquifer.=20 Fluoride and strontium are, in addition, involved in (side) reactions of = cation=20 exchange due to postdepositional salinity changes, and iodide is = significantly=20 mobilized by oxidizing organic matter, especially if deposited in marine = environments. This study illustrates the importance of identifying = natural=20 marine sources of trace elements in groundwater, in order to exclude = potential=20 pollution sources and expensive site investigations. It also shows that = many=20 other trace elements normally are not associated with marine sedimentary = environments or postdepositional salinity changes, and thus may = necessitate=20 further research on potential anthropogenic sources.

Sappa G, Coviello MT
Genesis of various brackish = and=20 hypersaline groundwaters by hydrochemical and isotopic approach in South = Latium=20 Region case study

Salinization and contamination by nitrates and pesticides are the = most=20 typical or significant contamination problems affecting southern = European region=20 (ESTRELA et al. 1996). This is also the case of the southern coastal = part of the=20 Latium region, a flat area, extended for 800 km2, with an elevation = range of 0 -=20 30 m above mean sea level, and a yearly average precipitation of 30* 106 = mc/yr.=20 In this region the contribution of irrigation to groundwater = contamination is=20 two-fold. On the first, aquifer is vulnerable to overexploitation which=20 increases a water table drawdown, and as a consequence of it, the = evolution of=20 seawater intrusion. Second, deep =96 percolating water from irrigation = contributes=20 to aquifer enrichment by pollutants accumulated on farmland. Groundwater = is=20 characterized by high concentrations of nitrate, sulphate and chloride. = The aim=20 of this study is to characterize chemically and isotopically nitrate=20 contaminated groundwater in an area polluted by the use of synthetic = fertilisers=20 due to a very intensive agriculture activity (mainly corn and = horticulture).=20 This study is part of a research project aiming to understand the = mechanism and=20 the causes of evolution of seawater intrusion involving the whole of = this=20 aquifer.


Modeling - Case Studies


Kamps P, Nienhuis P, Schaars F
Comparing = capture zone=20 calculations using a transient simulation with SWI and modified = Advection=20 packages for salt/fresh interface movement and a steady state simulation =

In the course of several minor changes and updates in the ground = water=20 abstraction license for the Amsterdam Water Supply dune production site, = updated=20 25 and 100 year capture zones for an excentric abstraction canal had to = be=20 recalculated in 2005. At that time it was not yet possible to invoke = path line=20 calculations with the Modflow 2000/SWI-package based groundwater model = that was=20 in use for various simulations. Although it was known that the real = capture=20 zones could be influenced by transient effects triggered by the closing = down of=20 another nearby large drinking water abstraction, we had to refer to a = steady=20 state model to approximate the location and extent of the capture = zones.
With=20 the availability of the recently implemented pathline option for the SWI = package=20 (Schaars et al, this volume) we could compare the used steady state=20 approximation with a transient solution that properly takes into account = movements of the salt/fresh interface. The results are yet uncertain = because=20 insufficient data were available for the initial salt/fresh interface = position=20 outside the Amsterdam Water Supply dunes, which turned out to be a very=20 important factor. Nevertheless the sensitivity of the system for that = initial=20 position indicate that for long-term transient simulations salt/fresh = interface=20 movements had better not be ignored.

Masciopinto C, Palmisano VN, Vurro M
A DSS able = to=20 implement an artificial recharge plant: an application to Muravera's = plain=20 (Sardinia, Italy)

The artificial recharge techniques are characterized by different = methods and=20 technologies. The selection of the optimal recharge method and = technology=20 requires the knowledge of physical, chemical and biological phenomena = which=20 involve water and wastewater filtration in subsoil together with = engineering=20 aspects related to the plant design and maintenance programs. A decision = support=20 system (DSS) can provide a contribution able to help technicians and = decision=20 makers in order to select the best recharge method and, consequently, = wastewater=20 treatments required before artificial recharge implementations. The = Flumendosa=20 is the second largest river of Sardinia island and, along Tyrrhenian = coast, at=20 South-Eastern of Sardinia, this river crosses Muravera's plain. The = economy of=20 the area, which is also of relevant environmental interest, relies = heavily on=20 agriculture as well as tourism and aquaculture along the coast. The = plain=20 consists of Holocene and Pleistocene alluvium up to a 200-300 m of = depth. These=20 deposits overlay the metamorphic granite Palaeozoic bedrock that = outcropping the=20 edges of the plain. Two aquifers have been identified in the subsoil of = this=20 plain: the shallow phreatic aquifer, 10-20 meters deep, and the deep = aquifer, up=20 to a 200-300 m of depth, which is confined by a clay layer. This latter=20 formation presents a variable thickness raging from few meters to = several tens .=20 Minor aquifers are represented by series of fractures draining the = bedrock at=20 the bottom of the confined aquifer. The water table trend and = groundwater=20 quality which have been periodically monitored in the last 30 years show = a=20 widespread and progressive saltwater intrusion into both the aquifers. = As a=20 recent result, extensive tracts of soil in the coastal plain are = unusable for=20 agriculture because of increasing water and soil salinization (Ardau et = al.,=20 2002). A DSS, previously implemented (Masciopinto et al., 1991), has = been=20 updated and applied to Muravera region in order to determine the best = artificial=20 recharge methodology that may be set up to contrast salt water intrusion = and to=20 increase ground water storage. The results have been verified by = studying the=20 movement of the salt water/freshwater sharp interface into both the = costal=20 aquifers. A mathematical model recently developed (Masciopinto, 1995) = performed=20 the 3D visualization of the Ghyben-Herzberg sharp interface position = along the=20 coastal aquifers. The presented methodology allows a rapid = identification of=20 wells which remain interested by salt water intrusion even though = recharge=20 operations may be implemented. Furthermore it was possible immediately = to=20 realize the capability of the artificial recharge implemented in order = to remove=20 the salt water intrusion from groundwater.

Bonte M, Biesheuvel A
The Application Of The = Seawat 2000=20 Variable Density Model For The Wieringerrandmeer Project

The Wieringerrandmeer project comprises the establishment of a fresh = water=20 lake with an area of roughly 700 hectares, located on the interface of = the=20 former island of Wieringen and the Wieringer-meerpolder in the north of = the=20 Netherlands. The design surface water level of the proposed = Wieringerrandmeer=20 will be around 4 meters above the polder surface water level. For this = reason,=20 the establishment of the lake is expected to impact both on groundwater = flow and=20 salinity patterns. These effects are imposed on a groundwater system = which is=20 not in steady-state. This is due to historical and future changes. The=20 historical changes include the region's transition from fresh water = swamp to sea=20 to reclaimed land. The future changes include cli-mate change and land=20 subsidence. To assess the effect of the establishment of the = Wieringerrandmeer=20 on groundwater conditions, a vari-able density groundwater flow and = solute=20 transport model was developed using the SEAWAT model. The flow component = of the=20 model was calibrated against measured hydraulic heads. Calibration of = the solute=20 transport component of the model was not possible because long-term = salinity=20 measurements are not available. To obtain an indication of the = reliability of=20 the model's predictions, the calculated temporal salinity trends were = compared=20 to the hydrochemical data and surface water salinity. The results of the = numerical modelling show an increase of groundwater salinity and = salt-load in=20 the remaining Wieringermeerpolder and the topographically lower area of=20 Wieringen. This process almost doubles the naturally occurring = salinisation. On=20 the topographically higher areas of Wieringen the ef-fect is opposite: = the=20 modelling results indicate that the fresh groundwater lens is protected = from=20 rising sea water level. This means that the Wieringerrandmeer actually = acts as a=20 control measure to prevent the fresh water groundwater resource from=20 salinisation due to rising sea levels and climate change. The results of = the=20 groundwater modelling were therefore directly used to optimise the = design of the=20 surface water system aiming to reduce surface water salinity. This has = led to an=20 optimised polder drainage system and surface water system where saline=20 groundwater seepage is diverted from the Wieringerrandmeer, whilst = relatively=20 fresh groundwater is retained within the newly formed island of = Wieringen. In=20 this paper, the method of model calibration and the modelling results = are=20 presented. The results indicate that surface water management provides a = powerful tool for protection of valuable fresh groundwater resources = against the=20 potential effects of climate change.


Modeling Techniques


Kacimov AR, Sherif M
New Analytical Solution For = A Sharp=20 Interface

Rigorous, closed-form solution for the hydraulic head, sharp = interface shape=20 and position in a confined aquifer bordered on one side by a static = interface=20 with intruded sea water and on another side by a constant head boundary = is=20 obtained in terms of the Dupuit-Forchheimer model. A linear and = nonlinear=20 differential equations governing the hydraulic head variation with the=20 horizontal coordinate contain a sink term, which is assumed to have a = constant=20 strength over the un-intruded part of the catchment and linearly = decreasing=20 strength through the section overlying the interface. Solutions of the = two=20 equations are conjugated. For the length of the fresh water zone a = quartic is=20 obtained and solved. An explicit solvability condition is presented. The = interface equation includes the commanding fresh water head, sea water = level,=20 density contrast between saline and fresh water, aquifer thickness and=20 conductivity, and intensity of smeared losses, which model abstraction = from the=20 aquifer. Examples and applications to the Batinah coastal area in Oman = are=20 presented.

Goswami RR, Hogan M, Clement TP
Experimental=20 Investigation Of Saltwater Intrusion And Comparison With Numerical=20 Results

Analysis of saltwater intrusion problems requires advance numerical=20 techniques that can solve highly non-linear, density-coupled flow = equations. The=20 robustness of these numerical techniques is often evaluated by solving = two=20 classic theoretical benchmark problems, known in the literature as the = Henry=20 problem and the Elder problem. The Henry problem is based on a = semi-analytical=20 solution published by Harold Henry, and the Elder problem is a = theoretical=20 problem which was built based on a heat conduction experiment. Both = these=20 problems have severe limitations and hence have been criticized for = their=20 in-efficiency related to numerical reproducibility. Simpson and Clement = (2003)=20 identified that the Henry problem has a hypothetical seaward boundary = and is=20 relatively insensitive to the coupled and uncoupled flow and transport=20 simulations. Elder problem is inherently unstable and very sensitive to = the=20 numerical parameters. Kolditz et al. (1997) identified that mesh = refinement=20 produces results different than those experimentally achieved by Elder. = The=20 focus of this study is to develop experimental datasets that can be used = for=20 benchmarking numerical models used for simulating saltwater intrusion = processes.=20 Two numerical codes were used to model the laboratory data. These models = include=20 SEAWAT, a widely used numerical code developed by USGS, and a = two-dimensional=20 variable density code developed by our research group. Our analysis = comprises of=20 three sets of validation exercises to rigorously test these numerical = codes. The=20 first exercise involves matching the observed interface location = recorded under=20 both transient and steady state conditions. The second validation = compares the=20 flux measurements and transport times collected from the experiments and = in the=20 numerical results. Our third validation set will be comparing the = experiments in=20 two difference scales (using a 53 cm x 30 cm x 2.7 cm flow tank and a = 120 cm x=20 60 cm x 5 cm flow tank) and the numerical model will be used to analyze = the=20 scaling behaviour.

Gotovac H, Andricevic R, Gotovac B, Vranjes=20 M
Multi-Resolution Adaptive Modeling Of Density-Driven = Flow=20 Problems

Many groundwater flow and transport problems require extensive = computational=20 resources, especially in problems with sharp fronts, narrow transition = zones,=20 layers and fingers. Numerical modeling of such processes usually has = significant=20 difficulties in resolving numerical oscillations and dispersion. To = overcome=20 these difficulties the demanding computational resources with very fine = grid and=20 small time steps are needed. In this paper we present multi-resolution = adaptive=20 Fup approach which is able to solve density driven flow problems. = Numerical=20 procedure is named Adaptive Fup Collocation Method (AFCM), based on Fup = basis=20 functions with compact support. The method enables adaptive = multi-resolution=20 approach to solution with different spatial and temporal scales and with = desired=20 level of accuracy using the entire family of Fup basis functions. In = addition,=20 the utilized collocation algorithm enables mesh free approach with = consistent=20 velocity approximation and flux continuity due to localized and = infinitely=20 derivable Fup basis functions. The introduced numerical procedure is = tested and=20 verified on 1-D vertical density driven flow and transport problem. The = results=20 demonstrate that the method is robust and efficient particularly in = describing=20 sharp fronts and narrow transition zones changing in space and time. = AFCM=20 enables accurate solution defined by prescribed threshold and actively = controls=20 all types of numerical errors. Efficiency of the method is described by = the=20 compression coefficient that is defined as ratio between number of = collocation=20 points in the non-adaptive and adaptive algorithms. Non-adaptive = algorithm=20 requires all points in the maximum level which is needed for the same = accurate=20 solution in comparison with the described adaptive algorithm. = Compression=20 coefficient is between 20 and 40 which show efficiency of the proposed = AFCM.=20

Romero P, Elorza FJ, Murillo JM, Rodr=EDguez = L
Effects Of=20 The Convective Form And The Divergence Form Of Feflow In The Simulation = Of=20 Seawater Intrusion

The physical process of transport in the seawater intrusi=F3n is due = a two=20 important mechanisms: the convection and hydrodinamic dispersion = (mechanic=20 dispersion molecular diffusion), thus to this is important to study the=20 influence of these mechanisms of transport in the shape and position of = the=20 transition zone. In this paper is presented the effects of the transport = forms:=20 convective and divergence form in the 3D numerical simulation of the = seawater=20 intrusion. For which, in the simulation was used the results of the = density=20 variable model in the Cabo Roig coastal aquifer, this aquifer is located = in=20 south of Alicante province (Spain). At this time, the groundwater in = some=20 aquifer zones presents a water quality deterioration due to the seawater = intrusion. The hydrogeologic model has an area of 61 km2 and a maxima = thickness=20 of 120 m approximately. The numerical code FEFLOW was used for to make = the=20 numerical simulation and to study the effects of the convective and = disperive=20 terms in the transport equation of the salt in the groundwater. This = code allows=20 to work with two options: the convective form and the divergence form. = The=20 convective form eliminates the convective term and considers the = dispersive term=20 single. The divergence form includes both terms: convective and = dispersive. The=20 convective form and the divergence form present physically equivalent = equations=20 of transport, but these differ in the formulation of the boundary = conditions.=20 Thus, different boundary conditions in the sea were used to study the = behaviour=20 of the seawater intrusion in 3D. Furthermore, in the budget was analyzed = the=20 variations of the inflow/outflow due to buoyancy and inflow/outflow in = the=20 boundaries.

Boluda N, Gomis V, Pedraza R
Acuaintrusion, A = Graphical=20 User Interface To A Hydrogeochemical Seawater Intrusion = Model

ACUAINTRUSION is a graphical user interface to a reactive = multicomponent=20 transport model for saturated porous media (Gomis et al., 1996), = designed with=20 Visual Basic 6.0 (Microsoft=AE). The computer program permits the = simulation of=20 chemical changes occurring during salt water intrusion in = one-dimensional=20 reactive flow through permeable media which assumes local thermodynamic=20 equilibrium. A numerical method resolves a set of partial differential = equations=20 based on the conservation of mass applied to each one of the chemical = elements=20 of the system. The differential equations are solved together with the = proposed=20 equilibrium equations and the material and charge balances of the = different=20 chemical species and elements. The reactive transport model capabilities = can be=20 used to study seawater intrusion in natural systems (for example the = classical=20 Valocchi=B4s injection experiment (Valocchi et al., 1981)) or in = laboratory column=20 experiments (Appelo and Postma, 2005, Gomis et al., 1997) including 1D=20 reactive-transport, speciation, ionic exchange and = precipitation-dissolution of=20 calcite and gypsum. ACUAINTRUSION provides an easy way to obtain = seawater=20 intrusion simulated data of the major anions and cations from several = specified=20 variables (freshwater concentration, flow rate, length and diameter of = the=20 considered column, density of sediment, CEC, exchange coefficients and % = calcite) and from the experimental breakthrough curve of chloride. The = graphical=20 user interface has two functions. Firstly, it has to calculate the = transport=20 parameters. To do so, it needs a chloride concentration versus = experimental time=20 data input from an Excel file of Microsoft Office. The calculated = parameters=20 are: residence time, P=E9clet number (uL/D, u interstitial velocity, L = length and=20 D dispersion), porosity, dispersion coefficient and dispersivity. = Experimental=20 concentration data and the simulated breakthrough curve are compared = (Figure 1).=20 Secondly, the interface automatically uses the calculated transport = parameters=20 to run the reactive model. It needs other input data such as the = properties of=20 the porous medium and the discretization of x and t (Figure 2). The = simulated=20 seawater intrusion data are provided in an Excel file. Figure 1. One of = the=20 screens of ACUAINTRUSION with the calculated transport parameters and = the=20 experimental and calculated chloride breakthrough curves. Figure 2. = Screen=20 showing the schematic column with dialog box open to input the = properties of the=20 porous medium.


Intrusion in Sedimentary Aquifers


Mohamed MMA, Sherif MM
Modeling Of Salt Water = Intrusion=20 In Fujairah Coastal Aquifer In The Uae

The proper assessment and management of groundwater resources in the = coastal=20 aquifers of the United Arab Emirates would certainly contribute to = availability=20 of suitable water resources for different purposes with specific = reference to=20 agriculture development. Water conservation, enhancement of water = quality in=20 costal groundwater systems and restoration of the depleted groundwater = resources=20 in the various aquifers are among the critical water problems that need = to be=20 addressed. Records over the last two decades indicate that groundwater = levels in=20 almost all the coastal aquifers of UAE are declining. This decline in = the=20 groundwater level is naturally associated with a significant = deterioration in=20 the groundwater quality, mainly due to the seawater intrusion problem = and lack=20 of recharge. Till 1996, the recorded average annual rainfall in UAE was = around=20 110 mm. Initial review of rainfall records over the last 8 years has = shown that=20 the average annual rainfall has dropped to less than 80 mm in the two = countries.=20 Many wells have been terminated and several farms have been abandoned = during the=20 last decade in several coastal areas of UAE due to the excessive = intrusion of=20 seawater into freshwater aquifers. The problem was more pronounced in = the=20 coastal aquifer of Fujairah. Therefore, the coastal aquifer of Fujairah = has been=20 selected to constitute the subject matter of this paper. The overall = objective=20 of this research is to ensure the sustainable development of groundwater = resources in the coastal aquifers of the United Arab Emirates. The = research will=20 serve as an example for management of the groundwater resources in the = costal=20 aquifers of UAE. The sustainable long-term pumping from the coastal = aquifers=20 will be determined and the optimum location for any additional pumping = will be=20 identified. A numerical approach will be employed to model = groundwater-seawater=20 movement and a procedure will be established to identify the critical = pumping=20 and location of the well fields. In order to identify the aquifers' = parameters=20 and the transition zone between the freshwater and the seawater, = comprehensive=20 geophysical work will be conducted in the coastal aquifer. Based on the=20 availability of data in the selected areas, the results will be compared = with=20 actual field measurements.

Miriounis C, Voudouris K, Tsourlos P, Dimopoulos G, Soulios=20 G
Hydrochemical And Geophysical Survey Of The Almiros = Aquifer=20 System, East Central Greece

The Almiros plain is located in the central eastern part of Greece, = covering=20 an area of 110 km2, with a mean altitude of 30 m. The topographic relief = is=20 controlled by the neotectonic action. The study area is drained by small = torrents; flow in these torrents persist during the wet period, after = heavy=20 storms. The study area is formed of recent unconsolidated material = consisting of=20 sands, pebbles, and fine clay to silty sand deposits. The neogene = formations are=20 characterized by alternating coarse and fine materials. As a result of = their=20 origin the deposits are characterized by high degree of heterogeneity = and=20 anisotropy. South and North of the studied region, limestones, flysch = and=20 schists-cherts crop out. The main aquifer systems are developed in = limestone=20 (karst aquifer) and in coarse post alpine deposits. In order to examine = the=20 hydrochemical characteristics, 90 and 73 groundwater samples from = boreholes were=20 collected during the period May and September 2005, respectively. The = samples=20 were analyzed in the laboratory of Engineering Geology & = Hydrogeology of=20 Aristotle University of Thessaloniki for major ions Ca2+, Mg2+, Na+, K+, = Cl-,=20 NO3-, SO42-, HCO3- and Total Hardness (TH). The electrical conductivity = (EC)=20 values range between 382 and 8075 =B5S/cm (May) and between 435 and 9410 = =B5S/cm=20 (September); high values of electrical conductivity along the coastline = are=20 attributed to seawater intrusion, as a result of the intensified = exploitation.=20 The Cl- concentration ranges from 30 mg/L to 460 mg/L. From the = groundwater=20 balance estimates, it is obvious that the aquifer system is = overexploited and=20 has shown signs of depletion and quality contamination. The seawater = intrusion=20 is the clearest evidence that present exploitation of the aquifer is not = sustainable. The geophysical investigations comprised of measurements = along=20 several profiles using the electrical resistivity technique (ERT). = Data-set were=20 obtained using several known electrode arrays with variable = interelectrode=20 spacing in an attempt to provide information about both the general = geological=20 and hydrogeological setting of the studied area with special focus into = the=20 mapping of the saline intrusion front. Results were processed with a new = 2D=20 inversion algorithm which allows the combined weighted inversion of data = arising=20 from different electrode arrays. The produced subsurface images are = jointly=20 interpreted with the results of the hydrochemical surveying and the = drill=20 information in order to define the extension of the seawater intrusion = front.=20 Finally it is pointed out that, a rational management plan should be = applied, in=20 order to restore the negative water balance and to improve the = groundwater=20 quality of the aquifer systems.

Rouaida T, Zairi M, Dhia HB
Delineation Of = Seawater=20 Intrusion In The Phreatic Aquifer

In the Djebeniana region, the phreatic coastal aquifer is the = important=20 natural source for agricultural water supply. The actual pumping well = density is=20 about 100 wells per km2, with a total estimated annual withdrawal of = about 16.57=20 Mm3 in 2003. The groundwaters from the wells are generally of poor = quality: they=20 exhibit significant variations of TDS, resulting mainly from intensive=20 exploitation, agricultural activities and the presence of highly soluble = minerals in the reservoir material. In the coastal areas, the important = spatial=20 and temporal variations in groundwater heads and TDS indicated the = gradual=20 inland movement of saltwater from the sea into freshwater of the = phreatic=20 aquifer. Considering the groundwater flow lines, typical trends in TDS = time=20 series, hydro-chemical classification method (Stufzand), electrical = conductivity=20 logs and geophysical logs are studied to evaluate seawater trapped in = this=20 shallow aquifer. The knowledge of the historical and present rate of = movement of=20 the seawater and the determination of the present location of the = interface=20 between freshwater and seawater are needed to provide the information = required=20 by the authorities to make decisions on changes of management = operations. Key=20 words: seawater intrusion, groundwater flow, hydrochemistry, geophysical = logs.

Gargini A, Maccanti I, Piccinini L, Vincenzi=20 V
Monitoring Dual-Density Shallow Groundwater Flow For=20 Understanding Salinization Effects In Paleo-Channel Quarry Lakes In A = Lowland=20 Coastal Plain

Planning of sands quarries in lowland alluvial coastal plains = addresses=20 paleo-channels as main targets of exploitation. At the same time these=20 geological bodies are fresh groundwater reservoirs and important = barriers to=20 prevent salinisation originating from brackish waters of different = origins: sea,=20 connate waters, coastal lagoons, land reclamation canals. Sand mining in = below=20 sea level territories is capable so to induce undesired effects on = shallow=20 groundwater flow system as local mounding of interface or changing = groundwater=20 flow inside the sandy lithosomes with risk of increasing the overall = salinity of=20 a fragile ecosystem. A territory where this potential conflict, between = economic=20 development and environmental protection issues, arises is the coastal = Po plain=20 where the altitude is at or below the sea level, as a consequence of = land=20 reclamation in hystorical times, and where the location of the interface = between=20 fresh and brackish/salty groundwater doesn't follow the classical=20 Ghyben-Hertzberg pattern but is defined as a sub-horizontal surface, = located at=20 variable depth in relationship to the fresh water hydraulic loading = coming from=20 direct recharge or from irrigation canals. Paleo-channels control the = dynamics=20 of the dual-density flow, being the main location of direct recharge = (higher=20 relative permeability and susceptibility to infiltration) and of lateral = recharge (main irrigation canals often follow the trace of paleo-river = beds).=20 The paper deals with a monitoring system set-up in the eastern sector of = Ferrara=20 province (Emilia-Romagna region, Northern Italy). Monitoring is = finalized to=20 acquire input parameters to calibrate a dual-density groundwater flow = model to=20 properly size the extension and depth of a sand quarry, with the goal of = minimize the enviromental impact on groundwater and surrounding = environment. The=20 site is located in the municipality of Ostellato along a paleo-channel = formed by=20 fine to coarse sands and pertaining to the ancient delta of the Po river = (Pad=F2a-Eridano branch). The maximum thickness of sands is about 25 m = from the=20 top (2 m b.g.l., below about 2 m of silts) down to 27 m b.g.l. (grey = clays at=20 the bottom). Laterally the sandy lithosome changes gradually to sandy = coastal=20 dunes deposits and silty-clayey transitional lagoonal deposits, both = brackish in=20 nature. At a depth varying with the dynamics of recharge (between 15 and = 20 m=20 b.g.l.) we have the interface between fresh and brackish groundwater = (identified=20 with the value of 2500 =B5S/cm). A borehole-based continuous monitoring = of=20 hydraulic head, groundwater temperature and specific electrical = conductivity has=20 been designed and installed. Since August 2005 the monitoring system, = made up of=20 a total of 9 bore-holes and 27 sensors is recording, on a hourly basis, = each=20 parameter; one 1 piezometers, screened for the total thickness of the = bore-hole,=20 a vertical EC profile is continuously recorded according 4 different = vertical=20 locations. Among the more interesting data collected up to now we have = to put in=20 evidence the excursion of interface between fresh and brackish = groundwater in=20 relationship non to direct recharge but to the hydraulic loading of = irrigation,=20 being so summer the season with the less salty conditions of = groundwater.

Ben Hamouda MF, Zouari K, Tarhouni J, Leduc C, Gaye CB, Oueslati = M
Characterization Of Marine Intrusion And Origin Of=20 Salinization In The Plio-Quaternary Oriental Coastal Aquifer Of Cap Bon=20 (Tunisia).

The intensive agricultural and economic activities induce the = increase of the=20 risk of groundwater quality degradation through high groundwater pumping = rates.=20 The salinization and contamination are the main sources of this = pollution,=20 especially in coastal aquifers. The characterization of marine intrusion = and the=20 determination of the origin of the salinization in the plio-quaternary = oriental=20 coastal aquifer of Cap Bon (Noth-East of Tunisia about 60 km south of = the Tunis=20 city), and the understanding of its hydrogeological and geochemical = behaviours=20 related to overexploitation of water resources, were studied by the = geochemical=20 tools (conservative elements: Br? and Cl?), and by the stable isotopes = (18O, 2H)=20 of water molecules. The landscape is a coastal plain slightly sloping = (3%)=20 towards the sea. For the characterisation of sea water intrusion, the=20 piezometric and salinity map were established. The overexploitation of = the=20 aquifer is characterized by the falling of piezometric head over a wide = region,=20 reducing the outflow rate to the sea, and the continuous degradation of = the=20 chemical quality of water. Depression cones in various places have = dropped to 5=20 to 10 m below sea level, which testifies the inversion of the hydraulic = gradient=20 and the invasion of seawater. The salinity of the groundwater appears to = originate from dissolution of minerals (halite) in the aquifer system. = The=20 higher values of the dissolved anions and cations in korba area are due = to=20 higher sodium and chloride concentrations coming from mixture with sea = water.=20 The changes of the latter concentration seem to be associated with = changes of=20 the proportion of local recharge. In general, the oriental coastal = aquifer plain=20 receives relatively an acce good recharge coming from water of current=20 precipitation. This contribution of current water is shown also on the = deep=20 aquifer. This situation seems to indicate that the reconstitution of the = reserves is fast in these areas. The salinity is generally acquired by=20 dissolution associated with a process of evaporation. However for the=20 plio-quaternary shallow aquifer a contamination by a mixture with = seawater is=20 extremely probable, in particular in the sectors of Korba and = Tefelloune, where=20 we observe a negative piezometry and the salinity can reach the 12 g/l = and the=20 sea water intrusion which may reach 70 % depending on location.

Nadia S, Larabi A, Lorrai E, El Amrani Paaza=20 N
Information System elaboration for the water resources = of=20 Souss Chtouka region (Maroc)

"=C9laboration d'un Syst=E8me d'Information pour les ressources en = eau de la=20 r=E9gion de Souss Chtouka (Maroc)" Un grand nombre de donn=E9es et = d'informations de=20 base, statistiques, spatiales et temporelles sont requises pour fournir = les=20 =E9l=E9ments de d=E9cision de l'utilisation des ressources en eau; les = syst=E8mes=20 d'information g=E9ographique sont devenus de puissants outils de gestion = et=20 d'analyse de ces donn=E9es, qu'ils traitent de mani=E8re souple, = vari=E9e et int=E9gr=E9e,=20 en produisant aussi bien des cartes, que des tableaux ou des graphes.=20 L'exploitation intensive des eaux souterraines qui est la principale = ressource=20 de la r=E9gion de Souss Chtouka est de plus en plus accentu=E9e. Une = telle situation=20 risque d'induire d'autres types de probl=E8mes, la n=E9cessit=E9 d'une = intervention=20 urgente pour la ma=EEtrise de la gestion des ressources en eau = souterraine, est=20 bas=E9e sur une connaissance pr=E9cise des ressources naturelles et de = son=20 environnement: hydrog=E9ologiques, g=E9ologiques, g=E9ophysiques, = physiques-chimiques=20 et donc l'exploitation d'un grand volume de donn=E9es qui est un = challenge tr=E8s=20 ouvert concernant le domaine des Syst=E8mes d'Information G=E9ographique = (SIG), et=20 celui des Bases de Donn=E9es (BD).

Aureli A, Baiocchi C, Di Pasquale M, Mazzurco N, Miceli C, = Silluzio=20 C
The influence of seawater intrusion on pollutant = diffusion in=20 an industrialized coastal area

The area concerned by the events described herein surrounds the Gulf = of=20 Augusta in Sicily, where in 1950 the petrochemical hub of Augusta =96 = Priolo =96=20 Syracuse, one of the most important industrial hubs in Italy, was set = up. The=20 industrial settlement progressively transformed the local environment = and the=20 small towns of Megara Iblea and Melilli Marina disappeared. Industries = drilled=20 more than one hundred wells, exploiting local groundwater reserves to = satisfy=20 the ever-growing demand for fresh water. Irrational, uncontrolled and=20 competitive groundwater abstraction in the 1960s -70s, produced a water = level=20 drawdown to 50 metres below sea level, resulting in severe seawater = intrusion,=20 amply reported in the literature . Two aquifers existed locally, a = phreatic=20 aquifer in the Quaternary sediments overlying Pliocene-Pleistocene = clayey=20 sediments, and a more important deep confined aquifer, hosted in the=20 water-bearing limestones and calcarenites of Mio-Pliocene age. These two = initially separate aquifers, were connected by a number of boreholes = carelessly=20 drilled by industries. Seawater intrusion was first detected in the = surficial=20 aquifer and subsequently seriously affected the deep aquifer, impairing=20 groundwater quality for industrial use and drinking water supplies. = Furthermore,=20 groundwater and soils were jeopardized in depth by pollution from both=20 industrial waste dumps and refinery products leaking from tanks and = pipelines=20 damaged by local seismic activity. The discovery of a large quantity of=20 hydrocarbons in some wells alarmed the population and local authorities=20 responsible for pollution control. A major and comprehensive campaign of = investigations, which involved drilling hundreds of geognostic boreholes = equipped with piezometers, indicated the magnitude and extent of = contamination.=20 In the 1970s and '80s, industries attempted to check saline intrusion by = stopping groundwater abstraction from the wells nearest the coast, = drilling new=20 ones inland. However, this did not produce satisfactory results as = contamination=20 was detected at the surface and in depth even in the remotest wells, = with the=20 result that industries eventually decided to close and seal a number of = wells=20 definitively. Since the surface strata were considered irretrievably = lost, the=20 attention was focused on the diffusion of pollutants in the deep aquifer = also=20 exploited for drinking water. A detailed epidemiological investigation = recently=20 showed a statistically significant increase in the number of cancer = cases and=20 deformities in the area, especially among people living at Augusta, = Melilli and=20 Priolo, alarming the local population and authorities. The phenomenon = has been=20 studied in order to devise a rational land restoration programme locally = and=20 analyse pollutant transport from the deep aquifer to the fresh water. = Pollutants=20 such as products for mineral oil refinement, synthetic materials and = heavy=20 metals permitted to perform an accurate three-dimensional reconstruction = of=20 local water-bearing zones and to study water flow. It is clear how the=20 progressive mixing of polluted and brackish water, coming from saline = intrusion,=20 causes the diffusion of pollutants, also helped by their sulphur and = chloride=20 content that make them readily soluble. Pollutants movement in natural = flow=20 directions has been modified by two elements: the hollow produced by = irrational=20 exploitation of the land and the presence of brackish water that changes = the=20 salinity of certain pollutants. This review provides a description of=20 particularly interesting facts and events.

Reynolds-Vargas J
Impact Of Population Growth = And=20 Tourism On Coastal Aquifers In Costa Rica

Rapid population growth and increasing water demand are adversely = affecting=20 groundwater in many coastal areas of Costa Rica, where the main sources = of=20 drinking water are coastal aquifers, now used intensively by the = flourishing=20 tourist industry. For this reason, and in order to propose technically = feasible=20 solutions, the analysis of the situation in this area is urgent. This = case study=20 is focused on the Potrero and Brasilito aquifers, located in the western = part of=20 the Nicoya Peninsula, in Guanacaste. Both are unconfined aquifers, = formed by=20 very permeable alluvial deposits of sands and gravel. Groundwater has = been=20 traditionally used by farmers tapping the aquifers mainly from = wide-diameter,=20 hand-excavated wells, no more than 5m below ground level. However, = during the=20 last 15 years groundwater has found further use, as touristic = development=20 requires it for purposes other than satisfying drinking water needs, = such as=20 irrigation of golf courses, gardens and other recreational spaces. = Furthermore,=20 the seasonality of precipitation creates different conditions for water=20 availability, since potential evapotranspiration is often higher than = 1200 mm=20 during the dry season, implying a hydro deficit during several months. = Tourist=20 visitation peaks in the dry season, coinciding with the time when = natural water=20 availability is at its lowest. In addition, aquifers in the area face = threats=20 such as seawater intrusion favored by overexploitation; microbiological = and=20 nitrate contamination derived from septic tanks; chemical leaching from=20 inadequate disposal of solid wastes; impermeabilization of recharge = areas due to=20 urban expansion; and disappearance of sensitive, and often unique, = wetlands=20 which are dependent on groundwater discharges. It is clear that = groundwater=20 pollution and aquifer depletion will affect the economic activities = related to=20 tourism in the future; not to mention the current negative impact those = changes=20 have on the local population. Nevertheless, insufficient knowledge of = the=20 hydrodynamics of the coastal environment and the inadequacy of existing = legal=20 instruments often preclude effective decision making and creates = conflicts=20 between tourist resorts and the surrounding communities. Some = recommendations=20 are made with an emphasis on actions that should be part of an = integrated and=20 comprehensive management scheme aiming at sustainability of groundwater=20 resources. Such actions include a detailed study of the dynamics of = coastal=20 environments, the delineation of well head protection areas and the=20 participation of multi-stakeholders in decision making processes.

Molinari FC, Severi P
A Study Of The Coastal = Acquifers=20 In Emilia-Romagna Region

The study sets out to determine the stratigraphic architecture of the = coastal=20 aquifers of Emilia-Romagna Region, in particular in the area of the = Ferrara=20 Province's. Both in view of future hydrogeologic studies and an optimum=20 managment of groundwater resources, the study aims at defining the = distribution=20 and the physical buondaries of groundwater reservoirs (composed of sand = bodies),=20 the associated permeability barriers and the interface between fresh = water and=20 brackish water. The subject of the study is represented by the = middle-upper=20 Pleistocene sediments that constitute the more recent portion of the=20 Peri-Sutural Padan Basin's filling (Bally & Snelson, 1980); the = sediments=20 were produced by the depositional activity of fluvial deltaic systems = which were=20 both axially-fed, verging towards the East (paleo-Po river), and=20 transversally-fed (Appenninic provenance). The methodology is based on = the=20 recognition of stratigraphic units belonging to the Depositional = Sequences=20 category, sensu Mitchum et. Al. (1977). From a hydrogeologic point of = view,=20 Depositional Sequences may be grouped into distinctive hydrogeologic = units,=20 whose main feature is that they are inclusive of an areally extensive, = scarcely=20 permeable or impermeable bottom layer, that hinders the possibility of = water=20 exchanges between aquifers belonging to superposed units; these = hydrogeologic=20 units have been informally named "Hydrostratigraphic-Sequential Units" = (HSU)=20 (AGIP-RER, 1998). The HSUs have a stratigraphic meaning, since, by = definition,=20 they are bounded by discontinuity surfaces and related conformity = surfaces of=20 basinal extension. Data correlation, carried out with a = stratigraphic-sequential=20 approach, has enabled: =B7 to recognize, within every single=20 Hydrostratigraphic-Sequential Unit, fine grained, transgressive deposits = coarsening upward to regressive deposit; =B7 to find out that the = transgressive=20 deposits pass from lagoonal or shoreface deposits, within the basal = HSUs, to=20 coastal plain or lower delta plain deposits, within the upper HSUs; in = the same=20 way, the regressive deposits pass from shoreface or delta front = sediments, to=20 continental, delta and alluvial plain deposits; =B7 to recognize that = the coarse=20 regressive deposits make great aquifers, separated by thick and areally=20 extensive permeability barriers, composed of the fine transgressive = deposits.=20 The most important aquifers are sheet sandbodies with an average = thickness of=20 25-30m and are areally very extensive ; usually these sediments are=20 unconsolidated, well-sorted, and consist of very fine-medium and coarse = sand. In=20 these deposits there is no break between sandy shoreface/delta-front=20 (marine-seaward) sediments and sandy delta-plain/delta-lobe = (alluvial-inland)=20 sediments. Muddy and silty units within the sandbodies are commonly = restricted=20 in extent. The deposits that make up great aquifers are frequently = shoreface or=20 delta-front sediments, thus pore water was originally saline; at present = fresh=20 water occupies many areas of these acquifers. The depositional cycle of = HSUs has=20 been strongly conditioned by high-frequency climatic/eustatic = oscillations. The=20 explanation herein suggested is based on the concept that during the = progressive=20 drop of sea-level, the connate saline water was simultaneously flushed,=20 following the sea-level drop, from the deltaic and shoreface sediments, = porous=20 and permeable, just deposited. The following sea-level rising, which is = very=20 fast, cause the sedimentation of transgressive lagoonal or shoreface = deposits,=20 mainly fine grained, that seal the deltaic reservoir (aquifer) saturated = with=20 fresh water during the previous drop in the sea level. The most = characteristic=20 type of water-quality degradation in coastal plain aquifers of = Emilia-Romagna=20 Region is saline water intrusion. In the 50s and 60s the = methane-producing=20 well-fields and then heavy industrial pumpage have produced an active = saline=20 water encroachment. In the aquifers the consequences of the saline-water = encroachment are considerably severe. In particular the concentrated = withdrawal=20 of ground water near Ferrara city has created a deep cone of depression=20 (Provincia di Ferrara-RER,1987-1990) and the natural hydraulic gradient, = already=20 very weak, has been reversed; this has caused connate saline ground = water to=20 move inland (westward) towards the well-fields for significant distances = (50-60=20 Km). Analyzing the available data it is possible to see that because of = the high=20 trasmissivity of the aquifers, saline water occupied many areas in only = a few=20 years. The deep confined aquifers have been less exploited than the = upper=20 aquifers but they have nevertheless had an active saline water = encroachment even=20 if in small areas. As the HSUs are hydraulically unconnected the saline = water=20 intrusion has resulted different both in space and in time. The huge = quantity of=20 data available, together with teorical progress in the last few years in = stratigraphical field that have permitted new possibilities of = correlation and=20 3D reconstruction of sedimentary deposits, have brought about new = knowlwdge on=20 the coastal aquifers relationship of Emilia-Romagna Region. The most = important=20 aspect is that every single aquifer is within distinctive hydrogeologic = units,=20 whose main feature is that they are inclusive of an areally extensive, = scarcely=20 permeable or impermeable bottom layer, that hinders the possibility of = water=20 exchange between acquifers belonging to superposed units. These = knowledge=20 demostrates the unsuitability of monoaquifer model, used in most of the = Padan=20 Plain, bringing about a new scenario in the groundwater development, = managment=20 and hydrogeological protection. The genetic interpretation of the = stratigraphic=20 architecture of coastal aquifers should represent the basis of all = specialist=20 examinations, in particularly in monitoring and in the prevention of = internal=20 saline water.

Milnes E, Meilhac C, Yeo D, Renard P, Schnegg P, Bourret=20 F
Hydrogeological, Hydrogeochemical And Geophysical=20 Investigations In The Akrotiri Aquifer: Identification Of Multiple = Salinization=20 Processes And Implementation Criteria For Monitoring = Networks

The Akrotiri aquifer in Southern Cyprus has been heavily exploited = over the=20 past 60 years and seawater intrusion has been observed since the = construction of=20 the Kouris dam in the late 80's. The authorities adopted a management = scheme in=20 the beginning of the 90's to prevent further groundwater degradation and = applied=20 the same scheme for the entire area, i.e. reduction of the pumping = rates.=20 Hydrogeological investigations were carried between 2000 and 2004, = including=20 hydrogeochemical and geophysical campaigns and revealed the presence of = three=20 main, partly superimposed salinisation processes: seawater intrusion,=20 agriculturally induced and irrigation-related salinisation and direct=20 evaporation from shallow groundwater. Identification of the spatial = distribution=20 of the dominant salinisation processes is crucial for the design of = adequate=20 management schemes. In the Akrotiri aquifer, as in many other coastal = aquifers,=20 the adopted management scheme is based on the threat of seawater = intrusion only,=20 and therefore fails in the areas where irrigation-induced salinisation = and=20 direct evaporation have been shown to be the dominant salinisation = processes.=20 Results from the large-scale investigation as well as from small-scale=20 monitoring stations are presented and used to identify the spatial = distribution=20 of the three main salinisation processes. The available historical data, = necessary for the calibration of a numerical model, are shown to be = spatially=20 very heterogeneously distributed, since the main aim of the existing = monitoring=20 network is to survey seawater intrusion. The amount and quality of the = data is=20 therefore often insufficient to elaborate a numerical model with which = the=20 superposition of multiple salinisation processes can be simulated. = However, a=20 numerical model that is intended to be used for the design of an = efficient=20 management scheme has to include the different salinisation processes. = The field=20 investigation clearly revealed the type and spatial distribution of such = missing=20 data sets and allowed to establish criteria to implement and extend = monitoring=20 networks for multiple salinisation processes. Using hydrogeochemical = information=20 and combining them with piezometric data and, if available, with = geophysical=20 results allows identification of vulnerable areas where monitoring is = crucial.=20 Such monitoring networks can eventually provide the necessary data for = numerical=20 models allowing.

Barrocu G, Muzzu M, Staffa F, Testa M, Uras = G
The GALDIT=20 method to map the vulnerability to seawater intrusion in the Arborea = coastal=20 aquifer (central-western Sardinia)

Hydrogeological conditions and human activities in the vicinity of = coasts=20 have a significant influence on groundwater quality and supplies, often = the only=20 source of coastal fresh water. The objective of this study is to map the = vulnerability of zones in a coastal area to salt water intrusion. The = area=20 selected for the study is the coastal plain of the reclaimed area at = Arborea in=20 central western Sardinia, where a superficial aquifer occurs, underlain = by a=20 multilayer confined aquifer. The expansion of agricultural and cattle = raising in=20 this area has caused, logically, two major problems, one associated with = aquifer=20 pollution caused by fertilizers and animal waste , the other with = salination by=20 seawater intrusion as the result of groundwater overexploitation by = wells. The=20 method adopted for the vulnerability study is a point count system = model,=20 developed by Chachadi and Lobo-Ferreira in the framework of the EU-India = INCO-DEV COASTIN project. It is based on six parameters, groundwater = occurrence,=20 aquifer hydraulic conductivity, height of ground water level above sea = level,=20 distance from the shore, impact of existing status of sea water = intrusion and=20 thickness of the aquifer, giving the acronym GALDIT. Each of the six = indicators=20 has a pre-determined fixed weight that reflects its relative importance = to=20 seawater intrusion. Based on this weight, a quantitative estimate of = GALDIT=20 index is computed, which is then used for classifying the vulnerability = zones.=20 The vulnerability of the area to seawater intrusion is assessed on the = basis of=20 the GALDIT Index, computed using GIS methods. Generally speaking, the = lower the=20 index, the less vulnerable the aquifer is to seawater intrusion.

Vandenbohede A, Lebbe L, Gysens S, De Wolf=20 P
Infiltration of salt water in artificial sea inlets in = the=20 Belgian dune area

The Flemish Nature Reserve 'Westhoek' is situated along the = French-Belgian=20 border and is the largest unfragmented dune complex of the Belgian = coast.=20 Ecological value of the nature reserve is recognised to be high. To = enhance=20 biodiversity in the nature reserve, more specifically the development of = natural=20 habitats of annex I of the European Habitat-directive, two sea inlets = were made.=20 Therefore, the foredune ridge was breached in two places. Through these = sea=20 inlets, sea water has access to depressions behind the foredunes during = high sea=20 levels. This work was carried out between January 2004 and June 2004. = Since an=20 important fresh water lens is present under the dune area, which is for = instance=20 exploited by a water catchment, the infiltration of salt sea water must = be=20 closely monitored. Therefore 36 observation wells (18 deep, 18 shallow) = are=20 present around the two sea inlets. On regular basis, geophysical = borehole=20 measurements with a focused electromagnetic induction tool (EM39) are = conducted.=20 These show the infiltration and migration of the salt water deeper in = the fresh=20 water reservoir. Vertical and lateral movement of the salt infiltration = water=20 can be followed in time. Due to the detailed vertical resolution of the=20 EM39-logs, individual events of salt water infiltration can be = identified as if=20 salt water infiltrated in pulses. Divers are placed in some of the = observation=20 wells. These measure the evolution of hydraulic head and the temperature = of the=20 water in the observation wells in time. This data set provides detailed=20 information on the infiltration in function of time. The shallow wells = (7 m)=20 show an abrupt rising of the hydraulic head during spring tide. = Afterwards,=20 there is a slow decline until the next spring tide. Thus only during = spring=20 tide, an important amount of salt water can infiltrate. This is also = visible on=20 the time-temperature logs were a sudden change in temperature occurs = after=20 spring tide. These are the individual pulses of salt water which can be=20 identified on some of the EM39 measurements. The deeper wells (30 m) = show mainly=20 the influence on tides on the hydraulic head and the effect of the salt = water=20 infiltration is small. By combining the EM39 measurements, hydraulic = head and=20 temperature measurements, infiltration of salt water in this dynamical = tidal=20 environment can be followed and studied in detail.

Tenalem A, Barbieri G
Groundwater management and = quality=20 problems in the Aynalem well field of Mekele town and its environs, = Northern=20 Ethiopia

Aynalem well field is the major source of the Mekele town (300,000=20 inhabitants) water supply; which is the capital of Tigray Regional = State. The=20 area has semi-arid climate with annual rainfall of around 600 mm. The = well field=20 is covered with extremely fractured Mesozoic sedimentary rocks intruded = by=20 dolerite dyke swarm. In this study attempt was made to investigate the=20 hydrogeology of the well field by giving particular emphasis to = characterization=20 of the aquifer systems from water management perspective and = hydrochemical=20 variability. Conventional hydrogeological investigation was employed = including=20 hydrogeological mapping, pumping test analysis, hydrochemical and = piezometric=20 survey. Supporting geophysical and isotope data were also used. The = study=20 revealed that the well field has highly variable hydrostratigraphic = units and=20 aquifers. More than 22 boreholes were drilled having discharge rate = ranging from=20 15 to 30 l/sec with a total safe yield of about 220 l/sec. For the last = three=20 years total yield of the well field declined down to 70 l/sec due to=20 over-pumping and reduction of direct recharge by extreme draught. For = the same=20 period the sub-regional groundwater level declined in places up to 5 = meters. The=20 most affected aquifer systems are confined within the weathered and = fractured=20 dolerite and limestones. In addition to the decline of water level and = yields of=20 the wells, it was observed an environmental change downstream of the = well fields=20 i.e. springs and marshy areas dried out and wells which were artesian = ceased to=20 exist. The main problems of well yield decline is attributed to external = factors=20 (reduction in the direct recharge) and internal factors related to water = management problems. The hydrochemical study revealed the presence of = two main=20 water types: calcium sulphate and calcium bicarbonate; the former being = more=20 hard. The high hardness is related to the existence of thin interbedded=20 evaporitic deposits within the Mesozoic sedimentary sequence which = characterize=20 the water with high salinity. The extremely high hardness and salinity = made most=20 of the groundwater unusable for community water supply. In places = nitrate=20 pollution has been detected. Except the high hardness, nitrate and boron = concentration the water fulfills the national water quality standards = for=20 domestic and agricultural uses.

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