Abstract
Abstract. In view of the complexity of the phenomenon of water related soil erosion in the Bia catchment area, linked to a large heterogeneity of soils, to a very scattered and in some places non-existent vegetation cover, and to a poorly distributed precipitation in both space and time, a mapping test of the “specific erosion” random variable is undertaken. The mapping of the intensity of the erosion hazard was carried out using the Universal Soil Loss Model (USLE). The map shows that the basin is generally characterized by relatively moderate erosion rates with an average erosion rate of 16 t/ha/year.
Highlights
This study aims to use a universal soil loss equation (USLE) based model integrated under a Geographical Information System to quantify and map the risk of water erosion over the Bia watershed
The average value of weighted K for the entire basin is 0.13, which confirms the high susceptibility of the soils in the Bia watershed to water erosion
The most significant findings of this study are that soil loss in the area is well beyond the tolerance limit and that crop factor is more important in influencing soil loss
Summary
The transport of sediment resulting in nutrient inputs accelerates the process of silting, silting and eutrophication of lakes (offsite damages) (Kouassi et al, 2013) In light of these negative consequences, the phenomenon of erosion is of particular interest for the economic development of countries (Raissouni, 2011). The integration of existing models with methods such as remote sensing and geographic information systems has made it possible to minimize financial costs and save time for risk mapping and targeted and rapid response In this context, this study aims to use a universal soil loss equation (USLE) based model integrated under a Geographical Information System to quantify and map the risk of water erosion over the Bia watershed
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