大型水库建设对下游已冲淤平衡的水库库区淤积及过坝泥沙特征影响研究  

Influence of large-sized reservoir construction on sedimentation of downstream reservoir with erosion-deposition balance and characteristics of sediment over dam

作　　者：高志良 沈定斌 柯虎 熊小虎 

机构地区：[1]国电大渡河流域水电开发有限公司库坝管理中心,四川成都614900

出　　处：《大坝与安全》2017年第4期36-41,共6页Dam & Safety

摘　　要：龚嘴水库已基本达到冲淤平衡,但在上游新建大型水电站清水下泄冲刷下,根据实测资料分析了冲刷前后的库容、床沙组成、库区断面的变化,表明龚嘴水库库区断面出现明显的冲刷,水库泥沙呈堆丘式向坝前推移,冲刷作用对水库库容的恢复是有利的,但库容恢复相对下泄清水时间有一定的滞后。此外,水库泥沙的推移和床沙的粗化将导致过坝、过机泥沙粒径的增加,从而加剧对过流面的冲刷和对水轮机的磨蚀破坏。The reservoir area of Gongzui has basically reached the erosion-deposition balance. The in-fluence of clear water scour from new large reservoir on sedimentation of Gongzui reservoir is dis-cussed. The changes of reservoir capacity, sediment composition and reservoir section before and afterscour are analyzed, combined with measured data. The results show that there is obvious scour in reser-voir section, and the sediment is pushed forward to dam in the form of mound, which indicates thatscour is beneficial to the recovery of reservoir capacity. But the recovery of reservoir capacity has a cer-tain lag. Besides, the moving and coarsening of reservoir sediment would lead to an increase in the sizeof sediment over dam and generator set, which would aggravate the erosion on overflow surface and tur-bine.

关 键 词：冲淤平衡 清水冲刷 泥沙粗化 

分 类 号：TV145[水利工程—水力学及河流动力学]