DISTRIBUTION SPATIALE ET TENDANCES TEMPORELLES DE L’ÉROSIVITE DES PRÉCIPITATIONS DANS DES BASSINS VERSANTS DU SUD DU SÉNÈGAL (GAMBIE ET CASAMANCE)

Abstract

Water erosion is one of the main environmental concerns in West Africa. The purpose of this study is to analyze the spatial distribution, temporal trends and erosivity of rainfall in the Gambia and Casamance basins from 1980 to 2016. Cartographic processing is carried out by Arc Map and Surfer 10.0 software and statistical data by excel. The results show a decrease in the precipitation concentration and seasonality indices following a South-North gradient. The Fournier Index Modified, gives strong erosivity in all the study stations. This therefore results in strong water erosivity in the south of the country. This study provides soil erosivity data for better sustainable management of soil and water resources in Senegal.