Integrating hydrogeochemical and geophysical data for testing a finite volume based numerical model for saltwater intrusion

In this paper, hydrogeological and geophysical data are used to validate a numerical model developed to predict seawater intrusion into coastal aquifers. The cell-centered finite volume method is adopted here to solve the set of coupled partial differential equations describing the motion of saltwat...

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Bibliographic Details
Published in:Transport in porous media 2001-04, Vol.43 (1), p.179-194
Main Authors: BOUZOUF, B, OUAZAR, D, HIMI, M, CASAS, A, ELMAHI, I, BENKHALDOUN, F
Format: Article
Language:English
Subjects:
Activation
Aquifers
Coils
Diamonds
Earth sciences
Earth, ocean, space
Electrical resistivity
Electromagnetic fields
Electromagnetic induction
Exact sciences and technology
Finite volume method
Flow equations
Fluxes
Geophysics
Geophysics: general, magnetic, electric and thermic methods and properties
Groundwater
Hydrogeochemistry
Hydrogeology
Hydrology. Hydrogeology
Internal geophysics
Interpolation
Mathematical models
Meshing
Partial differential equations
Saline water
Salt water intrusion
Seawater
Three dimensional flow
Water resources
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Summary:In this paper, hydrogeological and geophysical data are used to validate a numerical model developed to predict seawater intrusion into coastal aquifers. The cell-centered finite volume method is adopted here to solve the set of coupled partial differential equations describing the motion of saltwater and freshwater separated by a sharp interface. These equations are based on the Dupuit approximation and are obtained from integration of 3D flow equations for fresh and salt water zones over the vertical dimension. In order to have flexibility upon complex configurations domain, non structured grid meshing is utilized. To approximate the diffusion fluxes, Green-Gauss type reconstruction, based on diamond-cell and least squares interpolation, is performed. The model is first validated using academic test case studies with known closed form solutions. The mathematical model has been calibrated using hydrogeochemical and geophysical data. The geophysical method applied in this study has been a frequency domain electromagnetic method. In this method the apparent electrical conductivity is measured by induction using two separate hand-held transmitter and receiver coils. During the operation the transmitter coil is energized by a low frequency alternating current that radiates an electromagnetic field and the receiver coil detects the resulting field. Taking into account the relationship between the bulk conductivity of the subsoil and the conductivity of groundwater, EM soundings have been interpreted to provide complementary information to hydrogeochemical data to outline the fresh–saltwater interface. This methodology has been applied to the case of saltwater intrusion into the Llobregat delta aquifer, near Barcelona, Spain.
ISSN:0169-3913
1573-1634
DOI:10.1023/A:1010638200048