水库下游非均匀沙恢复饱和系数特性  

Analysis of nonuniform sediment recovery coefficient downstream from reservoir

作　　者：葛华[1] 朱玲玲[2] 张细兵[1] 

机构地区：[1]长江科学院河流所,湖北武汉430010 [2]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6期711-714,764,共5页Engineering Journal of Wuhan University

基　　金：水利部公益性行业科研专项项目(编号:200901003)

摘　　要：泥沙恢复饱和系数是泥沙数学模型中一个非常重要的参数,其取值合理与否将直接关系到利用泥沙数学模型进行河床演变及相关研究的成败.基于三峡水库蓄水后长江中游荆江河段的实测水沙资料,以本河段三峡水库蓄水前多年平均输沙水平作为泥沙输移方程中的挟沙能力,对水库下游非均匀沙恢复饱和系数进行了率定与分析,并在总结其规律的同时从多个方面对率定结果的合理性进行了讨论.研究结果表明,水库下游非均匀沙恢复饱和系数的数量级一般可达10-3～10-1,并且一般随着泥沙粒径的增大而减小,随着河床冲刷历时的增加和床沙粗化程度的提高而呈递减的趋势.The sediment recovery coefficient is a very important parameter in the sediment mathematical model,and whether its value is reasonable or not will be directly related to the success or failure of the river evolution or other similar researches,which are carried out by using the sediment mathematical model.Based on the field data of Jingjiang reach in middle Yangtze River after the impoundment of the Three Gorgers Reservoir,the nonuniform sediment recovery coefficient downstream of reservoir is calibrated and analyzed,while the average sediment transportation level of years is regarded as the sediment transportation capability;meanwhile its law and rationality are summarized and analyzed.The result shows that its magnitude can reach about from 10-3 to 10-1,generally increasing as the sediment particle size decreasing,and it also shows that there is a descending trend with the increasing of the duration of the erosion state and the degree of the bedload roughness.

关 键 词：恢复饱和系数 水库下游 非均匀沙 

分 类 号：TV14[水利工程—水力学及河流动力学]