Study on the Reducing Sediment Effect of 'Changzhi Project' in the Hill of Sichuan Basin

摘要

This paper used the "Changzhi Project" data, and analyzed the reducing sediment effect of various water and soil conservation methods on the slope or in a watershed, then using the result to study the reducing effect for water and soil conservation methods under different scales. The result showed that the "Changzhi Project" has obvious effect on reducing sediment on the slope or in a watershed, but the moving mechanic under different scales need further study. "Changzhi Project" (short for "water and soil major protection project in the upper of Yangtze River"), starting in 1989, and has been carried out in the integrative control engineering from the first to the fifth phased. Over 700 watersheds, and 150,000 km~2 total was controlled. For ten years of soil loss control, "Changzhi Project" has remarkably effect on eco-environmental construction and economic development for Yangtze River. This paper is a contribution to understand the sediment reduction effect of "Changzhi Project".