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 - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Hydrological Sciences Journal Year : 2011

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.

Dates and versions

insu-00648785 , version 1 (06-12-2011)

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Sylvain 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, 2011, 56 (7), pp.1242-1264. ⟨10.1080/02626667.2011.609171⟩. ⟨insu-00648785⟩
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