水库调度运行方式对水库泥沙淤积的影响

Impact of Reservoir Scheduling Mode on Sedimentation

水库泥沙淤积相关问题的研究是大型水库建设非常重要且必要的研究课题。通过库区55 km范围的泥沙物理模型试验,研究2种泥沙调度运行方式下(方式1为前50 a汛期高水位运行,后50 a汛期低水位运行;方式2为100 a保持汛期低水位运行)水库泥沙淤积演变过程、库尾淤积、淤积量等情况。研究表明,不同运行方式下,汛期坝前水位对水库泥沙淤积的沿程发展、库尾淤积高程等影响较大。通过比较分析,水库运行前50 a,2种运行方式下泥沙淤积差别较大,运行方式2,汛期保持低水位运行更有利于水库排沙减淤;水库运行后50 a,2种运行方式相同。随着运行年限的增加,2种运行方式下泥沙淤积趋于相同。

We established physical model of sedimentation in 55km range in the reservoir area to study the sediment characteristics including sedimentation evolution and sedimentation amount. Two different Scheduling modes of a reservoir was taken as case study. Research suggests that the control water level in flood period is very pivotal to the vertical distribution of reservoir sedimentation and the sedimentation at the reservoir tail. In the first 50 years of op- eration, the difference of sedimentation between the two scheduling modes is quite large ： for the second mode, low water level in flood season is more conducive to sediment sluicing and deposition reduction. After 50 years of opera- tion, the sedimentation in the two scheduling modes tends to be similar.