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：2005
卷号：16
期号：3
页码：199-207
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Axel Aurouet , Jean-Louis Devineau , Max Vidal Unité de recherche 136 IRD, Institut de recherche pour le développement (IRD), Centre IRD d’Orléans, 5, rue du carbone, 45072 Orléans cedex 2, Unité mixte de recherche 5145 CNRS/Unité de recherche 136 IRD, Centre IRD d’Orléans, 5, rue du carbone, 45072 Orléans cedex 2,, Unité de Formation et de recherche (UFR) Sciences, Université d’Orléans/Unité de recherche 136 IRD, Institut des sciences de la Terre d’Orléans, Rue de Saint-Amand, Bâtiment Géosciences, BP 6759, 45067 Orléans cedex 2 Key words: Africa, Burkina Faso, Climatology, Subsurface flow, Erosion Page(s) : 199-207 Published in: 2005 Analysis of geological, geomorphological and land use data with ETM + (Landsat Thematic mapper) imagery and terrain transect methods provides evidence of strong erosion and silt deposits on the outer margins of the riparian zone of the Mouhoun river at Boromo in western Burkina Faso. Residual mounds there, capped with soils of the flood plain now gone and with trees with bare roots yet still alive, attest to this strong and recent erosion. The vegetation cover of the protected areas of Baporo and Deux-Balé that extend alongside the riparian zone does not sufficiently reduce the strength of the run-off that generates this erosion. Moreover the secondary flow pattern through this adjoining area is probably related to substratum fractures directing the different subsurface flows that are apparently determinant in the dynamics of erosion. The lowered water level of the river thus appears to be the main cause of these dynamics today, especially of the recent erosion and dissection of lowland hardpan.
