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：2010
卷号：21
期号：4
页码：330-332
DOI：10.1684/sec.2010.0268
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Gil Mahe , Pierre Diello , Jean-Emmanuel Paturel , Bruno Barbier , Harouna Karambiri , Alain Dezetter , Claudine Dieulin , Nathalie Rouche IRD Université Mohamed V-Agdal BP 8967 10 000 Rabat-Agdal Maroc, 2IE (Institut international d'ingénierie de l'eau et de l'environnement) Rue de la Science 01 BP 594 Ouagadougou Burkina-Faso, Université Montpellier 2 HydroSciences Montpellier CC MSE Place E. Bataillon 34095 Montpellier cedex 5 France, Cirad-GEAU Key words: Burkina Faso, demography, rainfall, runoff, Sahel, surface condition, water flow DOI : 10.1684/sec.2010.0268 Page(s) : 330-2 Published in: 2010 The Nakambe basin in the Sahel at Wayen (Burkina Faso) is about 21,000 km² wide. Despite the rainfall shortage since 1970, the maximum daily discharge and the runoff coefficient have increased regularly. Floods now occur earlier, in August instead of September, and are more intense. This increase is also observed for other neighbouring Sahalien rivers. The maximum daily discharge has increased by about 100%, but the number of days with a discharge, over half the daily maximum, has increase only slightly over the same period, which means that the flood peak is thin. This runoff increase is related to population increase and to a strong decrease in natural vegetation replaced by cropping and bare soils, the runoff level of which is greater.
关键词：Burkina Faso; demography; rainfall; runoff; Sahel; surface condition; water flow
