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Water balance simulation for ressource evaluation at watershed scale : application to the Nema (Sudano-sahelian zone; Senegal).

Abstract The Nema is a river in the western Senegal where only a minority of inhabitants has access to drinking water. Rainfall has been decreasing in this region since the 1960s. It is crucial to know how this change is affecting groundwater recharge. The objective of this work is to determine the current proportions of groundwater recharge, runoff, subsurface runoff and evapotranspiration using a simulation approach. The Nash criterion and water balance error were used to evaluate the quality of the simulations. The results are as follows: the Nash criterion is 0.73 for calibration and also 0.73 for validation, and the water balance error is -0.35% and 0.005% respectively for the hydrological years 1995-1996 and 1997-98. Evapotranspiration and groundwater recharge are the main processes involved.

Auteur(s) : M.Idrissou, F.D. Ngom, R. Malou, B. Vayssade and A.-L. Courbis
Année de publication : Accep
Revue : Hydrological Science Journal. IAHS Publi.
Type : Article
Mise en ligne par : DIOP Fatou