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

Boucher, Marie and Favreau, Guillaume and Descloitres, Marc and Vouillamoz, Jean-Michel and Massuel, Sylvain and Nazoumou, Yahaya and Cappelaere, Bernard and Legchenko, Anatoli (2009) Contribution of geophysical surveys to groundwater modelling of a porous aquifer in semiarid Niger: An overview. In: Workshop on Hydrogeophysics, OCT 10-12, 2007, Autrans, France, pp. 800-809.

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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.

Item Type: Conference Paper
Additional Information: Copyright for this article belongs to Elsevier Science.
Keywords: Porous aquifer; Groundwater recharge; Infiltration; Electromagnetic methods (EM); Electrical resistivity tomography (ERT); Magnetic Resonance Sounding (MRS); Niger
Department/Centre: Others
Date Deposited: 02 Dec 2009 07:49
Last Modified: 19 Sep 2010 05:53
URI: http://eprints.iisc.ernet.in/id/eprint/25065

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