Modeling and mapping of water erosion in northeastern Algeria using a seasonal multicriteria approach

AurSs region remains one of the most exposed areas to water erosion phenomenon in Algeria, because of the strong climatic aggressiveness, the rugged relief, the predominance of sensitive land, and a vegetative cover that does not play its protective role. This article is a part of studies performed to protect agricultural and water infrastructure in this region. The main objective of this study is the cartographic modeling of an erosion hazard at the Oued Chemoura watershed, representative of the AurSs. The modeling approach uses a geographic information system and incorporates the following six factors controlling erosion: slope, friability of substrate, erodibility of soils, land cover, rainfall erosivity, and support practices. Result shows a synthetic map of the soil erosion hazard which locates the most threatened areas and priorities for possible planning interventions. A statistical study on the relationship solid-liquid flow was developed. Measurements conducted at the station of Chemoura, over the period 1969-1994, were exploited for this purpose. The results show a high specific degradation varying between 50 and 360 tons km(-2) season(-1).