Assessment of Erosive Activity By Modeling Approach in Northern Algeria

Abstract

The erosive activity in the Cheliff watershed (Algeria) draws its magnitude from the climatic, geological and geomorphometric conditions that characterize this region. Indeed, the high spatio-temporal variability of precipitation caracterising the semi-arid climate, coupled at a very pronounced relief with vulnerable lithologic composition amplified the phenemon. The extended no taring of the main hydrometric station, located at the exutory of Nahr Ouassel sub-watershed, makes inevitable the use of quantification by modeling. Moreover, the endoreism of the flows in the sub-basin prevents any significant correlation between rainfall and flows, which justifies the extrapolation of an adequate model. The regional model adopted in this study was established from the data of several hydrometric stations and dams through northern Algeria. The Bougara dam sub-basin was used for its validation. The main objective of this work is to estimate the specific degradation of Nahr Ouassel sub-watershed using an adequate model.

Keywords

• cheliff
• endoreism
• model
• correlation
• nahr ouassel