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

Jean-Christophe Comte, Olivier Banton

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38 Citations (Scopus)


[1] 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.
Original languageEnglish
Article numberL10402
JournalGeophysical Research Letters
Issue number10
Early online date18 May 2007
Publication statusPublished - May 2007


  • electrical resistivity tomography
  • groundwater modeling
  • seawater intrusion in coastal aquifiers


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