John Libbey Eurotext

Science et changements planétaires / Sécheresse

Study of suspended sediment load in semiarid Mediterranean regions: A case study from the watershed of wadi Sebdou (northwest Algeria) Volume 18, issue 1, Janvier, Février, Mars 2007

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Authors
Département d’hydraulique, Faculté des sciences de l’ingénieur, Université de Tlemcen, BP 230, Tlemcen, 13000 Algérie, Institut national des sciences appliquées de Strasbourg, 24, boulevard de la victoire, 67084 France
  • Key words: Algeria, erosion, hydrologic regime, sediment, semiarid zone, water flow, watershed
  • DOI : 10.1684/sec.2007.0067
  • Page(s) : 39-44
  • Published in: 2007

The analysis of the variations of suspended solid flow in wadi Sebdou and their relationship to liquid flow during the sampling period extending from 1985 through 1998, reveals a high erosion rate during the months of June and September, and an important irregularity in the solid discharge at annual scale. The ratio between maximum and minimum annual solid discharge reached 54.7. In addition, yearly average specific degradation over the thirteen-year period was estimated to be 1,330 ton per km 2. This value is relatively high compared to the estimates recorded in other watersheds with a similar hydrologic regime. Moreover, early autumn and late spring floods are responsible for the major part of the solid transport. In June 1996, for instance, the floods effectively transported 1.16 million tons of sediments to the watershed outlet, which is 3.4 times the average annual solid discharge observed in 13 years.