官厅水库位于北京西部,是永定河上游一座具有防洪、供水、发电综合效益目标的大型水库。1951年投建,1955年正式运用。三十年来,在免除官厅以上洪水对京、津、冀地区的威胁和向下游供水方面发挥了重要作用。但是,由于淤积严重,使得水库库容由22亿立方米降到16亿立方米,库区末端淤积上延对桑干河、洋河河道两岸产生一定影响,原设计效益目标无法实现。研究解决这 Located in the west of Beijing, Guanting Reservoir is a large reservoir with the goal of flood control, water supply and power generation in the upper reaches of Yongding River. Construction in 1951, 1955 formally used. In the past 30 years, it has played an important role in removing the threat of floods above the government hall to the Beijing, Tianjin and Hebei regions and supplying water to the downstream areas. However, due to siltation, the reservoir capacity dropped from 2.2 billion cubic meters to 1.6 billion cubic meters. The siltation in the end of the reservoir area has an impact on both Sanggan and Yanghe rivers. The original design benefit target can not be achieved. Research to solve this