刘家峡水库运用对黄河下游河道冲淤影响的初步分析

Effects of Operation of Liujiaxia Reservoir on Scouring and Silting in the lower Course of the Yellow River

刘家峡水库调节径流对黄河河道冲淤的影响主要反映在下游。从1969～1986年资料分析看出。由于刘家峡水库对径流的调节,总的是增加了下游河道的淤积;遇多沙系列年组,其影响较大,比无水库调节时每年平均增加淤积O.6亿t,占下游淤积总量的12%,遇少沙系列年组,其影响较小,比无水库调节时每年平均增加淤积0.23亿t,占下游淤积总量的19万,1969～1986年刘家峡水库运用平均每年增加下游淤积0.34亿t,占下游淤积总量的14%。

The effects on scouring and silting caused by the regulating runoff of Linjiaxia Reservoir mainly reflected on the lower reach of Yellow River. It generally increased the sedimen tation in the lower course from analysing the data measured in 1969—1986. In the serise of years with high sediment transport, this effects are greater, average annual amount of sedimentation increased about 60 million t, which it is 12% of the total sedimentation on the same course; But in the serise of years with low sediment transport, the effect is little, only 23 million t, being 19% of the total. In the period from 1969 to 1986, the amount of sedimentation increased was 34 million t annually, being 14% of the total amount of sediment in the same course.