Cross-validation of geo-electrical and hydrogeological models to evaluate seawater intrusion in coastal aquifers

Details Cross-validation of geo-electrical and hydrogeological models to evaluate seawater intrusion in coastal aquifers Cross-validation of geo-electrical and hydrogeological models to evaluate seawater intrusion in coastal aquifers

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410402c&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10402

Physics

Geophysics

2

Hydrology: Hydrogeophysics, Hydrology: Groundwater Transport, Hydrology: Model Calibration (3333), Exploration Geophysics: Magnetic And Electrical Methods (5109)

Scientific paper

The validation of variable-density flow models simulating seawater intrusion in coastal aquifers requires information about concentration distribution in groundwater. Electrical resistivity tomography (ERT) provides relevant data for this purpose. However, inverse modeling is not accurate because of the non-uniqueness of solutions. Such difficulties in evaluating seawater intrusion can be overcome by coupling geophysical data and groundwater modeling. First, the resistivity distribution obtained by inverse geo-electrical modeling is established. Second, a 3-D variable-density flow hydrogeological model is developed. Third, using Archie's Law, the electrical resistivity model deduced from salt concentration is compared to the formerly interpreted electrical model. Finally, aside from that usual comparison-validation, the theoretical geophysical response of concentrations simulated with the groundwater model can be compared to field-measured resistivity data. This constitutes a cross-validation of both the inverse geo-electrical model and the groundwater model.

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