Increasing river flows in the Sahel ?

Okechukwu Amogu 1 Luc Descroix 1 Kadidiatou Souley Yé Ro Eric Le Breton 2 Ibrahim Mamadou Abdou Ali 3 Jean-Claude Bader 4 Ibrahim Moussa 5 Emmanuè Le Gautier Sté Phane Boubkraoui Philippe Belleudy 6 Kadidiatou Souley Yéro Théo Vischel 1 Emmanuele Gautier 2 Stéphane Boubkraoui 1
1 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
2 LGP - Laboratoire de géographie physique : Environnements Quaternaires et Actuels
3 CRA - Centre Régional AGRHYMET
4 UMR G-EAU - Gestion de l'Eau, Acteurs, Usages
5 CERDI - Centre d'Études et de Recherches sur le Développement International
6 IMG - Institut de Mécanique de Grenoble (IMG)
Abstract : Despite the drought observed since 1968 in most of the West African Sahel, runoff and rivers discharges have been increasing in the same region. This trend is related with land use change rather than climate change. This paper aims to describe the regional extension of such a phenomenon and to demonstrate that the increase in runoff is observed from the point scale up to the regional scale. It highlights the opposition of functioning between a Sahelian zone, where the Sahel's paradox applies, and the Sudanian and Guinean areas, where runoff has been logically decreasing with the rainfall. The current OPEN ACCESS Water 2010, 2 171 trend is evidenced using experimental runoff plots and discharge data from the local to the regional scales.
Keywords : demography land use change climate change runoff Sahel drought
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Okechukwu Amogu, Luc Descroix, Kadidiatou Souley, Yé Ro, Eric Le Breton, et al.. Increasing river flows in the Sahel ?. Water, MDPI, 2010, 2 (2), pp.170-199. ⟨10.3390/w2020170⟩. ⟨ird-02153343⟩

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