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.
Highlights
Hydric erosion generated by the runoff is a widespread phenomenon in different Mediterranean countries
The situation continues to deteriorate; In Tunisia and Morocco the total area threatened by water erosion is respectively 40% and 45% [1] and in Algeria about 45% of the Tellian zones are affected, [2]
In Algeria, the sediment transport exported downstream every year a large quantity of sediments which affect the hydraulic works by rapid siltation and causes significant agricultural soil damage
Summary
Hydric erosion generated by the runoff is a widespread phenomenon in different Mediterranean countries. It continues to take considerable proportions especially in the semi-arid regions because of slopes, torrential rains, high vulnerability of land and unfavorable impact of agricultural activities. In Algeria, the sediment transport exported downstream every year a large quantity of sediments which affect the hydraulic works by rapid siltation and causes significant agricultural soil damage. As for, Demmak [8] and Meddi [9] have developed estimated models of specific degradation for a large scale in the north of Algeria. The main objective of this work is to determine the specific degradation of Nahr Ouassel watershed using an adequate model and the prescription of some measures wrestling against this phenomenon
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