Silting of the korama valley basins, south-eastern of Niger; quantification of contributions fromgullyerosion and alluvial cones
Water erosion is a serious threat in the Hamdara watershed. It mainly manifests itself in the form of gully erosion, which directly results in the silting up of low-lying areas and basins. The objective of this study is to characterise the spatio-temporal dynamics of gully erosion at the scale of the Hamdara watershed and to quantify the sediment flow deposited at the alluvial cone. The methodological approach adopted is based on remote sensing and topography, in particular the use of DGPS for intra-annual monitoring of two representative gullies (R1 and R2).