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Contribution of geophysical surveys to groundwater modelling of a porous aquifer in semiarid Niger: An overview

Marie Boucher 1, 2 Guillaume Favreau 3, 1 Marc Descloitres 4, 5 Jean-Michel Vouillamoz 4, 5 Sylvain Massuel 6 Yahaya Nazoumou 3 Bernard Cappelaere 1 Anatoli Legchenko 5
1 HSM - Hydrosciences Montpellier
2 IRD-UMR HydroSciences-Niamey
HSM - Hydrosciences Montpellier
3 Département de Géologie
4 IFCWS - Indo-French Cell for Water Sciences
5 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
6 CSIRO Land and Water
Abstract : Subsurface geophysical surveys were carried out using a large range of methods in an unconfined sandstone aquifer in semiarid south-western Niger for improving both the conceptual model of water flow through the unsaturated zone and the parameterization of numerical a groundwater model of the aquifer. Methods included: electromagnetic mapping, electrical resistivity tomography (ERT), resistivity logging, time domain electromagnetic sounding (TDEM), and magnetic resonance sounding (MRS). Analyses of electrical conductivities, complemented by geochemical measurements, allowed us to identify preferential pathways for infiltration and drainage beneath gullies and alluvial fans. The mean water content estimated by MRS (13%) was used for computing the regional groundwater recharge from long-term change in the water table. The ranges in permeability and water content obtained with MRS allowed a reduction of the degree of freedom of aquifer parameters used in groundwater modelling.
Keywords : Porous aquifer Groundwater recharge Infiltration Electromagnetic methods (EM) Electrical resistivity tomography (ERT) Magnetic Resonance Sounding (MRS) Niger
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https://hal-insu.archives-ouvertes.fr/insu-00448222
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Submitted on : Monday, January 18, 2010 - 3:01:41 PM
Last modification on : Friday, October 22, 2021 - 2:38:20 PM

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INSU | CNRS | HSM | AGROPOLIS | B3ESTE | UNIV-MONTPELLIER | IRSTEA | UNIV-SAVOIE | INRAE | UGA

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Marie Boucher, Guillaume Favreau, Marc Descloitres, Jean-Michel Vouillamoz, Sylvain Massuel, et al.. Contribution of geophysical surveys to groundwater modelling of a porous aquifer in semiarid Niger: An overview. Comptes Rendus Géoscience, Elsevier Masson, 2009, 341 (10-11), pp.800-809. ⟨10.1016/j.crte.2009.07.008⟩. ⟨insu-00448222⟩

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