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

Jean-Christophe Comte, O. Banton

    Research output: Contribution to journalArticle

    26 Citations (Scopus)

    Abstract

    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.
    [Comte, J.-C., and O. Banton (2007), Cross-validation of geo-electrical and hydrogeological models to evaluate seawater intrusion in coastal aquifers, Geophys. Res. Lett., 34, L10402, doi:10.1029/2007GL029981.]
    Original languageEnglish
    Article numberL10402
    JournalGeophysical Research Letters
    Volume34
    Issue number10
    DOIs
    Publication statusPublished - 28 May 2007

    ASJC Scopus subject areas

    • Earth and Planetary Sciences (miscellaneous)

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