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Integrated surface water-groundwater modelling in the context of increasing water reserves of a regional Sahelian aquifer = Modélisation intégrée surface--souterrain dans un contexte de hausse des réserves d'un aquifère régional Sahélien

Abstract : Despite the Sahelian drought of the 1970s-1990s, the unconfined aquifer in southwest Niger exhibits a multidecadal increase in groundwater reserves. Recent changes in land surface conditions have enhanced runoff and thus indirect groundwater recharge below endorheic ponds. This paper presents a model-based investigation of surface runoff and groundwater recharge at mesoscale (5000 km2). A new lumped-conceptual runoff model applicable to the large number of ungauged endorheic catchments is specially developed, derived from an existing fine-scale, physically-based hydrologic model. Runoff simulated for sites identified as groundwater recharge sources are used to derive recharge forcing for a Modflow-based model of the aquifer. The rising water table trend and its spatial distribution over the period 1992-2003 are generally well simulated, albeit smoothed year-to-year dynamics. Comparison with alternative methods of recharge estimation suggests, however, that there may presently exist more recharging sites and/or contributing surfaces than those considered so far.
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https://hal-insu.archives-ouvertes.fr/insu-00648785
Contributor : Pascale Talour <>
Submitted on : Tuesday, December 6, 2011 - 2:13:57 PM
Last modification on : Wednesday, October 14, 2020 - 4:13:29 AM

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S. Massuel, B. Cappelaere, G. Favreau, C. Leduc, T. Lebel, et al.. Integrated surface water-groundwater modelling in the context of increasing water reserves of a regional Sahelian aquifer = Modélisation intégrée surface--souterrain dans un contexte de hausse des réserves d'un aquifère régional Sahélien. Hydrological Sciences Journal, Taylor & Francis, 2011, 56 (7), pp.1242-1264. ⟨10.1080/02626667.2011.609171⟩. ⟨insu-00648785⟩

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