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

  • Amogu, O.
  • Esteves, Michel
  • Vandervaere, J.P.
  • Malam Abdou, M.
  • Panthou, G.
  • Rajot, Jean-Louis
  • Souley Yéro, K.
  • Boubkraoui, S.
  • Lapetite, Jean-Marc
  • Dessay, Nadine
  • Zin, I.
  • Bachir, A.
  • Bouzou Moussa, I.
  • Faran Maïga, O.
  • Gautier, E.
  • Mamadou, I.
  • Descroix, Luc
Publication Date
Jan 01, 2015
Horizon / Pleins textes
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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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