Bulletin des sciences géographiques de l'INCT
Volume 9, Numéro 2, Pages 79-94
2005-10-31

Comparison Of Sediment Yield In Two Catchments, Northeast Algeria



Authors : Khaunchoul K . Spiga Y . Jansson M. B .

Abstract

The present work compares the sediment yields in the Saf Saf (322 km) and Westem Kebir (1130 km) catchments in order to get a better comprehension of the different sediment transport conditions and the parameters that govern them. The suspended sediment transport of sampled stors were calculated using measured concentration samples and additional estimated concentrations from a regression of the stonn in question. to reconstruct the series having a low number of missing suspended sediment concentrations. These two previous results were used to develop a sediment rating curve with the discharge class method to calculate the concentrations from stoms with no or few suspended sediment samples. The mean annual sediment yield during flood events of the 22-year period (1975/76-1996/97) was 461 Tkm' in 1he Saf Saf drainage basin and 247 T km? in the Western Kebir basin. Although the Saf Saf drainage basin had lower rainfall and runoff. the erosion was higher. The high sediment yield in the Saf Saf basin could beexplained by poorly vegetated hillslopes in the winter and spring seasons. and cultivation on steep slopes exceeding 129% on marly• silty-clayey soils. The negative impacts of this enhanced sediment mobility are directly felt in the Zard~zas reservoir which collects the flows of the Saf Saf catclunent and is consequently highly reduced in its capacity. In storms of high magnitude during the winter and spring seasons. the Saf Saf wadi presents greatly peaked graphs of water discharge and sediment concentration which implies high sediment supply because of sparse vegetation, while the Western Kebir wadi presents broad graphs of discharge and comparatively low concentrations.

Keywords

erosion -- sediment yield -- catchments -- northeast Algeria

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