期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2009
卷号：20
期号：1
页码：145-152
DOI：10.1684/sec.2009.0163
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Ibrahim Bouzou Moussa , Oumarou Faran Maiga , Jean-Marie Karimou Ambouta , Benoit Sarr , Luc Descroix , Mahaman Moustapha Adamou Département de géographie Faculté des lettres et sciences humaines Université Abdou-Moumouni BP 418 Niamey Niger, Département de géographie faculté des lettres et sciences humaines Université Abdou Moumouni de Niamey BP 418 Niamey Niger, Département des sciences du sol Faculté d’agronomie Université Abdou Moumouni de Niamey BP 10960 Niamey Niger, Département de génie rural, eaux et forêts Faculté d’agronomie Université Abdou Moumouni de Niamey BP 10960 Niamey Niger, Centre régional AGRHYMET BP 11011 Niamey Niger, Laboratoire d’étude des transferts en hydrologie et environnement BP 53 38041 Grenoble France Key words: climate change, erosion, geomorphology, Niger DOI : 10.1684/sec.2009.0163 Page(s) : 145-52 Published in: 2009 Since 1994, the Mountseka valley in the Adar Doutchi area (south central Niger) has had 70 km of flowing water. Before this time, water flow was hindered by wind blown sand deposits and dejection cones. For this reason, particularly in its upstream section the valley had only ponds. The middle and downstream sections were used as fields for growing millet. Direct investigation has shown that this catchment basin is subject to an intensive process of water erosion due to the fragility of the soil and the weakness of ground vegetation. The processing of rainfall records shows the extent of rainfall extremes. Finally, maps showing the spatial layout of water erosion in relation to land occupation between 1986 and 2000 confirm our observations.
