Anti-erosive structures on small experimental mountainous basins in an Algerian semi-arid envrironment

摘要

Algeria is a mountainous and semi-arid Mediterranean country. Since the beginning of the 20(th) century, it has known very tough problems of erosion. On the high plains ill the Chelif River basin, where marls from the Miocene are extremely vulnerable to water erosion, two pairs of experimental research catchments (ERC) have been selected near Boughezoul dam. All catchments were observed during year 2000 to 2003 for testing, the efficiency of antierosive structures. In the developed basins, researches carried oil the comparison of various types of check-dams, made of local materials (rocks, plastic bags, metallic fence and used tires). These check-dams were compared with conventional "gabions" (rocks wall trapped into a metallic fence) and diversified vegetative cover replanting techniques. These researches aim at orienting the action of Authorities in the conservation of soils for reducing water pollution and preserving the hydraulic infrastructures against erosion.