Runoff evolution due to land-use change in a small Sahelian catchment

Abstract : Land-use changes have been significant these last decades in West Africa, particularly in the Sahel region; in this area, climatic and demographic factors have led to a rise in cropped areas in recent decades causing strong changes in the water cycle and in river regimes. This study compares the rainfall-runoff relationships for two periods (1991-1994 and 2004-2011) in two small and similar neighbouring Sahelian catchments (approx 0.1 km(2) each). This allows identification of the different hydrological consequences of land-use/land-cover change, particularly the fallow shortening and the consequent degradation of topsoil. The main land surface change is a 75% increase in crusted soil area. Runoff increased by more than 20% on average between the two periods while flood duration decreased by 50% on average. However, runoff values remained largely constant in the lower part of the northern basin due to a strong increase in in-channel infiltration.
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Soumis le : mardi 7 novembre 2017 - 18:56:46
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O. Amogu, M. Esteves, J-P. Vandervaere, M. Malam Abdou, G. Panthou, et al.. Runoff evolution due to land-use change in a small Sahelian catchment. Hydrological Sciences Journal, Taylor & Francis, 2014, 60 (1), pp.78 - 95. 〈10.1080/02626667.2014.885654〉. 〈ird-01630613〉



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