小湾水电站施工期坝下游河道淤积及清淤研究  

Sedimentation and its clearance in downstream channel of Xiaowan hydropower station during construction

作　　者：董先勇[1,2] 郭庆超[1] 曹文洪[1] 陆琴[1] 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]中国长江电力股份有限公司,湖北宜昌443133

出　　处：《泥沙研究》2010年第5期41-47,共7页Journal of Sediment Research

基　　金：国家自然科学基金(10572152);中国水利水电科学研究院科研专项经费(泥集YC0704)

摘　　要：受漫湾水库泥沙淤积上延和小湾电站施工弃渣共同影响,小湾水电站施工期坝下游河道发生了严重淤积,水位明显抬升,影响河道行洪能力和电站出力。为了减轻河道淤积带来的不利影响,本文首先对小湾水电站坝下游河道淤积成因进行了分析,分离出了小湾电站施工弃渣和漫湾水库泥沙淤积上延对水位抬升的影响程度,提出了利用小湾水库蓄水后水力自然冲刷并结合工程清淤来降低水位的措施。Under the combined effect of headward sedimentation in the Manwan reservoir and construction spoil of the Xiaowan dam,severe sedimentation occurred in the downstream channel of the Xiaowan dam during construction,which caused an obvious rising of water level at the same water discharge.The rising of water level affected not only the flow conveying capacity of the river,but also the hydraulic head of the Xiaowan hydropower station.To reduce the unfavorable effect of severe sedimentation,this paper firstly analyzes the reasons causing the sedimentation.The effects of Manwan reservoir headward sedimentation and Xiaowan construction spoil on water level rising are then separated.Finally,the effect of lowering water level by clear water erosion after the operation of the Xiaowan reservoir combined with engineering measures is given,and the effects of desilting amount and distance on further lowering of water level are discussed.

关 键 词：小湾水电站 淤积上延 清淤措施 水力自然冲刷 

分 类 号：TV148[水利工程—水力学及河流动力学]