Spatial Estimation of Soil Erosion Risk Using RUSLE/GIS Techniques and Practices Conservation Suggested for Reducing Soil Erosion in Wadi Mina Catchment (Northwest, Algeria)

Abstract

To meet the pressing water needs in Algeria, the state has put in place a strategy consisting of the creation of hydraulic infrastructure for the mobilization of surface water resources. In fact, 74 dams are currently in operation; these structures are silting up at a rapid pace, generating an estimated annual loss of 45 million m3. Sidi Mhamed Benaouda dam located in the Oranian hill, with a water capacity of respectively 241 million m3 plays a crucial economic role in this region. The protection of this dam against erosive processes is a pressing economic goal. To do this, the RUSLE/GIS approach was used to map the erosive hazard. The results obtained in the Mina catchment, following a subdivision of 1315 homogeneous land parcels, show a total annual loss of 60 million tons/year with an average loss of 11.2 t/ha/year. About 50% of the catchment area was predicted to have very low to low erosion risk, with soil loss between 0 and 7.4 t/ha/year. Erosion risk is moderate over 13.9% of the catchment, where calculated soil loss is between 7.4 and 12 t/ha/year. Erosion risk is high to dangerous over 36.1% of the catchment, where calculated soil loss is more than 12 t/ha/year. According to this study, it appeared clearly that we must intervene quickly by using reliable and effective conservation techniques.

Agricultural land abandonment and its impact on soil erosion in the Madi Watershed, Gandaki Province, Nepal

“…Soil erosion is a global challenge caused by water and wind forces dislodging and transporting soil particles, degrading soil quality (Benchettouh et al, 2021).The rates of soil erosion vary in different regions of the globe because of physical conditions like topography and rainfall intensity, and anthropogenic factors such as land use, and management practices (Xiong et al, 2019). Traditional farming practices on the hill slope and torrential rainfall in the summer season are a major threat to soil erosion in the Himalayan regions like Nepal (Chalise et al, 2019).…”