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

Yves Albouy 1 Pierre Andrieux 2 Gérard Rakotondrasoa Michel Ritz 3 Marc Descloitres 4 Jean-Lambert Join 3 Eddy Rasolomanana 5
1 COFRHIGEO - Comité français d'histoire de la géologie
2 SISYPHE - Structure et fonctionnement des systèmes hydriques continentaux
3 LGSR - Laboratoire GéoSciences Réunion
4 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
5 IOGA - Institut et Observatoire de Géophysique et Astronomie d'Antananarivo, Madagascar
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.
Keywords : aquifers groundwater electric current freshwater sand basalt coasts salinity water quality saline water Reunion
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Journal articles
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http://hal.univ-reunion.fr/hal-02100557
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Submitted on : Tuesday, April 16, 2019 - 9:25:33 AM
Last modification on : Sunday, July 14, 2019 - 2:09:45 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, Wiley, 2005, 39 (1), pp.87-97. ⟨10.1111/j.1745-6584.2001.tb00354.x⟩. ⟨hal-02100557⟩

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