小浪底水库异重流持续运动条件的定量准则  

Quantitative criterion of continuous motion conditions of turbid density current in reservoirs

作　　者：李书霞[1,2] 夏军强[3] 张俊华[2] 刘沛清[1] 王艳平[1,2] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083 [2]黄河水利委员会黄河水利科学研究院,河南郑州450003 [3]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2011年第5期599-603,共5页Engineering Journal of Wuhan University

基　　金：水利部公益性行业科研专项(编号:200901015,编号:200801024);教育部新世纪优秀人才项目(编号:NCET-10-0619)

摘　　要：异重流排沙是小浪底水库拦沙初期减少库区泥沙淤积的重要运用方式,异重流持续运动条件用于判断在不同水沙条件及库区地形条件下异重流能否运行到坝前而排出水库,是异重流排沙规律的主要研究内容之一.系统地总结了定性描述异重流持续运动条件的五方面内容,然后分析了现有异重流持续运动条件定量估计方法的不足.结合近年来小浪底水库异重流运行的观测资料,提出了用水流功率与库区平均水深定量表示异重流持续运动的临界条件,这种方法不仅考虑因素较为全面,而且能够充分反映库区地形特征对异重流持续运动的影响.To release sediment through venting turbid density currents is an important measure to reduce the sedimentation rate in a reservoir,especially at the initial operation stage of the Xiaolangdi Reservoir.A continuous motion criterion of turbidity current is usually used to predict whether turbidity currents can reach the dam after plunging and be vented under various conditions of incoming flow and sediment,and reservoir topography.In this study,existing qualitative criteria for continuous motion conditions of turbid density current are summarized;and shortcomings of existing quantitative criteria are presented.Together with the recent measurements of turbid density currents in the Xiaolangdi Reservoir,a new quantitative criterion is proposed to estimate the continuous motion conditions of turbid density current,which can be described by a relationship between mean stream power and mean water depth in the reservoir.This method can account for the effects of various influencing factors,including the influence of reservoir topography on the continuous motion conditions.

关 键 词：异重流 持续运动条件 定量估计方法 水流功率 小浪底水库 

分 类 号：TV145.21[水利工程—水力学及河流动力学]