关键词: 冲淤平衡, 清水冲刷, 泥沙粗化

Abstract: The reservoir area of Gongzui has basically reached the erosion-deposition balance. The influence of clear water scour from new large reservoir on sedimentation of Gongzui reservoir is discussed. The changes of reservoir capacity, sediment composition and reservoir section before and after scour are analyzed, combined with measured data. The results show that there is obvious scour in reservoir section, and the sediment is pushed forward to dam in the form of mound, which indicates that scour is beneficial to the recovery of reservoir capacity. But the recovery of reservoir capacity has a certain lag. Besides, the moving and coarsening of reservoir sediment would lead to an increase in the size of sediment over dam and generator set, which would aggravate the erosion on overflow surface and turbine.

Key words: erosion-deposition balance, clear water scour, coarsening of sediment