Apport de SIG pour la cartographie du risque de dégradation des sols par l’érosion hydrique Cas du Canton Rond point Parc National de Theniet el Had Wilaya de Tissemsilt

Abstract

Among the risks that affect the soil is water erosion, where the factors that cause water erosion are these five factors : rainfall intensity, slope and slope lenth, soil properties, vegetation cover and human activities, this is what the universal soil loss equation (USLE) deponds on, in this work, we combined five maps that represent the factors that influence and cause water erosion : the R factor of erosivity, the K factor of soil erodibility, the topographic factor LS, the cover factor C and the anti-erosion practices factor P to obtain the soil loss map, which is the factor A map, expressed in tonnes per hectare per year (t·ha⁻¹·an⁻¹). The results were classified into five cartegries of erosive intensity : very low (< 5), low (5-12) , moderate ( 12- 50), severe (50 – 100), and extremely severe (> 100), the results showed that the low (5-12) and very low (< 5) classes are dominant, while the , moderate ( 12- 50), severe (50 – 100), and extremely severe (> 100) classes are low in the study area.