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Evolution of Surface Hydrology in the Sahelo-Sudanian Strip: An Updated Review

Unité Mixte de Recherche (UMR, Lab) Patrimoines Locaux et Gouvernance (PALOC) Institut de Recherche pour le Développement (IRD)/Muséum National d’Histoire Naturelle (MNHN), Laboratoire Mixte International (LMI) Patrimoines et Territoires de l’Eau(PATEO), IRD Hann, BP 1386, 18524 Dakar, Senegal
Centre National de Recherches Météorologiques (CNRM), UMR 3589, Centre National de la Recherche Scientifique (CNRS)/Météo-France, 31057 Toulouse, France
UMR Géosciences Environnement Toulouse (GET) CNRS/IRD, Observatoire Midi-Pyrénées (OMP), 31400 Toulouse, France
Social and Economic Survey Research Institute (SESRI), Qatar University, Al Dafna. P.O. Box 2713, Doha, Qatar
Institut des Géosciences et Environnement (IGE) CNRS/IRD/Université Grenoble-Alpes (UGA)/Grenoble Institut National Polytechnique (GINP), Observatoire des Sciences de l’Univers de Grenoble (OSUG), 38400 Grenoble, France
UMR Hydro-Sciences Montpellier (HSM) IRD/Université de Montpellier (UM), 34000 Montpellier, France
Direction de la Gestion et de la Planification des Ressources en Eau (DGPRE), BP 14484, 18524 Dakar, Senegal
Department of Geography, Zinder University, BP 656, Zinder, Niger
Agence Nationale de l’Aviation Civile et de la Météorologie (ANACIM), BP 8184, 18524 Dakar, Senegal
Department of Geography, Université Cheikh Anta Diop (UCAD), BP 5005, 18524 Dakar, Senegal
UMR ESPACE DEV IRD/Institut de Recherche des Sciences et Technologies de l’Environnement et de l’Agriculture (IRSTEA)/UM, 34000 Montpellier, France
Direction Nationale de l’Hydraulique, BP 642, 999049 Conakry, Guinea
Coyne et Bellier, Tractebel Engineering France, 92622 Gennevilliers, France
Centre de Recherches Hydrologique (CRH) de l’Institut de Recherches Géologiques et Minières (IRGM), BP 4110 Nlongkak, 999108 Yaoundé, Cameroon
MEEF Ministère de l’Environnement des Eaux et Forêts/Ministry of Environment, Water and Forests, BP 761, 999049 Conakry, Guinea
Author to whom correspondence should be addressed.
Water 2018, 10(6), 748;
Received: 23 March 2018 / Revised: 24 May 2018 / Accepted: 30 May 2018 / Published: 8 June 2018
(This article belongs to the Section Hydrology)
In the West African Sahel, two paradoxical hydrological behaviors have occurred during the last five decades. The first paradox was observed during the 1968–1990s ‘Great Drought’ period, during which runoff significantly increased. The second paradox appeared during the subsequent period of rainfall recovery (i.e., since the 1990s), during which the runoff coefficient continued to increase despite the general re-greening of the Sahel. This paper reviews and synthesizes the literature on the drivers of these paradoxical behaviors, focusing on recent works in the West African Sahelo/Sudanian strip, and upscaling the hydrological processes through an analysis of recent data from two representative areas of this region. This paper helps better determine the respective roles played by Land Use/Land Cover Changes (LULCC), the evolution of rainfall intensity and the occurrence of extreme rainfall events in these hydrological paradoxes. Both the literature review and recent data converge in indicating that the first Sahelian hydrological paradox was mostly driven by LULCC, while the second paradox has been caused by both LULCC and climate evolution, mainly the recent increase in rainfall intensity. View Full-Text
Keywords: Sahel; land use/land cover changes; water holding capacity; climate change; hydrological paradox; re-greening Sahel; land use/land cover changes; water holding capacity; climate change; hydrological paradox; re-greening
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Descroix, L.; Guichard, F.; Grippa, M.; Lambert, L.A.; Panthou, G.; Mahé, G.; Gal, L.; Dardel, C.; Quantin, G.; Kergoat, L.; Bouaïta, Y.; Hiernaux, P.; Vischel, T.; Pellarin, T.; Faty, B.; Wilcox, C.; Malam Abdou, M.; Mamadou, I.; Vandervaere, J.-P.; Diongue-Niang, A.; Ndiaye, O.; Sané, Y.; Dacosta, H.; Gosset, M.; Cassé, C.; Sultan, B.; Barry, A.; Amogu, O.; Nka Nnomo, B.; Barry, A.; Paturel, J.-E. Evolution of Surface Hydrology in the Sahelo-Sudanian Strip: An Updated Review. Water 2018, 10, 748.

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