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• Amogu, O
• Descroix, L
• Yéro, K
• Le Breton, E
• Mamadou, I
• Ali, A
• Vischel, T
• Bader, J
• Moussa, I
• Gautier, E
• Boubkraoui, S
• Belleudy, P
• [+] on Google Scholar
• Amogu, O
• Descroix, L
• Yéro, K
• Le Breton, E
• Mamadou, I
• Ali, A
• Vischel, T
• Bader, J
• Moussa, I
• Gautier, E
• Boubkraoui, S
• Belleudy, P
• [+] on PubMed
• Amogu, O
• Descroix, L
• Yéro, K
• Le Breton, E
• Mamadou, I
• Ali, A
• Vischel, T
• Bader, J
• Moussa, I
• Gautier, E
• Boubkraoui, S
• Belleudy, P

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Water 2010, 2(2), 170-199; doi:10.3390/w2020170

Article

Increasing River Flows in the Sahel?

Okechukwu Amogu ¹ , Luc Descroix ^1,* , Kadidiatou Souley Yéro ¹ , Eric Le Breton ² , Ibrahim Mamadou ² , Abdou Ali ³ , Théo Vischel ¹ , Jean-Claude Bader ⁴ , Ibrahim Bouzou Moussa ⁵ , Emmanuèle Gautier ² , Stéphane Boubkraoui ¹  and Philippe Belleudy ¹

¹ Laboratoire d’étude des Transferts en Hydrologie et Environnement, LTHE, BP 53, 38041 Grenoble cedex 9, France ² Laboratoire de Géographie Physique, LGP, CNRS, place Aristide Briand, 92195 Meudon Cedex, France ³ AGRHYMET, BP 11011, Niamey, Niger ⁴ G-Eau laboratory, 361, rue J.F. Breton B.P. 5095, 34196 Montpellier Cedex 5, France ⁵ Department of Geography, University Abdou Moumouni of Niamey, BP 412, Niamey, Niger

* Author to whom correspondence should be addressed.

Received: 17 February 2010; in revised form: 1 April 2010 / Accepted: 27 April 2010 / Published: 7 May 2010

(This article belongs to the Special Issue Feature Papers)

Download PDF Full-Text [1157 KB, uploaded 7 May 2010 15:00 CEST]

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 trend is evidenced using experimental runoff plots and discharge data from the local to the regional scales.

Keywords: runoff; Sahel; drought; climate change; land use change; demography

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