Low sedimentation in the Sélingué dam reservoir (Mali-Guinea). Evidence of the stability of south Sudanese savannah at the scale of a large drainage basin very little affected by man
Résumé
Hydromorphogenic dynamics in West African drainage basins are complex phenomena that can be understood and measured through the study of sedimentation processes in reservoirs. By plotting a new topographic map of the reservoir, this study shows the limited sedimentation of Sélingué reservoir (Mali) in contrast with estimates prior to the building of the dam. Used together with studies on the specific degradation of large drainage basins and sediment transport, this study sheds new light on the hydrodynamic mechanics of a given bioclimatic environment. Specifically, for a drainage basin remarkable for its homogeneity of land use and vegetation, the study highlights the prime importance of the role of vegetation and human occupation in these hydromorphogenic processes. A new assessment of the storage capacity of the reservoir is made in the light of these findings.
Mots clés
Bathymetric profile sedimentation reservoir specific degradation South-sudanese climate dense dry forest savannah population density Sélingué reservoir Sankarani watershed Mali Guinea
Bathymetric profile
sedimentation
reservoir
specific degradation
South-sudanese climate
dense dry forest
savannah
population density
Sélingué reservoir
Sankarani watershed
Mali
Guinea
Domaines
HydrologieOrigine | Fichiers produits par l'(les) auteur(s) |
---|