Study on Mechanism of Sediment Reduction and Peak Flood Mitigation of 'Changzhi Project' in the Hill of Sichuan Basin

摘要

This paper used the "Changzhi Project" as object, and analyzed the function of sediment reduction and peak flood mitigation for various water and soil conservation methods on the slope, then using the result and hydrological model to study the benefits for water and soil conservation methods in a watershed under different scales. The result showed that the "Changzhi Project" has obvious effect on sediment reduction and control flood on the slope or in a watershed. The abbreviation for "Water and Soil Major Protection Project in the Upper Reaches of Yangtze River" is "Changzhi project" in China. This project has been starting in 1989, and has been implemented in the integrative control engineering from the first to the fifth period, and has been completed 700 watersheds, and the total controlled area was 150,000 km~2. For ten years of soil loss control, the "Changzhi Project" has played greatly important role on eco-environmental construction and economic development of in the Yangtze River basin. Meanwhile, in order to improve the integrative effect and study its influence on the sediment transport and peak flood mitigation in river, we implemented the benefits study on sediment reduction and peak flood mitigation of "Changzhi Project".