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Mapping Coastal Aquifers by Joint Inversion of DC and TEM Soundings‐Three Case Histories

Abstract : Electrical and electromagnetic methods are well suited for coastal aquifer studies because of the large contrast in resistivity between fresh water-bearing and salt walter-bearing formations. Interpretation models for these aquifers typically contain four layers : a highly resistive unsaturated zone ; a surficial fresh water aquifer of intermediate resistivity ; an underlying conductive, salt water saturated aquifer ; and resistive substratum. Additional layers may be added to allow for variations in lithology within the fresh water and salt water layers. Two methods are evaluated : direct current resistivity and time domain electromagnetic soundings. Use of each method alone produces nonunique solutions for resistivities and/or thickness of the different layers. We show that joint inversion of vertical electric and time domain electromagnetic soundings produces a more tightly constrained interpretation model at three test sites than is produced by inversion methods applied to each data set independently.
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Submitted on : Tuesday, April 16, 2019 - 9:25:33 AM
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Yves Albouy, Pierre Andrieux, Gérard Rakotondrasoa, Michel Ritz, Marc Descloitres, et al.. Mapping Coastal Aquifers by Joint Inversion of DC and TEM Soundings‐Three Case Histories. Groundwater, 2005, 39 (1), pp.87-97. ⟨10.1111/j.1745-6584.2001.tb00354.x⟩. ⟨hal-02100557⟩



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