非均匀沙不平衡输沙的理论研究  

Theoretical study of nonequililrium transportation of nonuniform suspended load

作　　者：韩其为[1] 

机构地区：[1]中国水利水电科学研究院泥沙研究所,北京100044

出　　处：《水利水电技术》2007年第1期14-23,共10页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金联合资助重点项目(50439020)

摘　　要：文中首先给出了由我们建立的床面泥沙交换理论导出的非均匀沙扩散方程的边界条件。建立了恢复饱和系数的表达式,包括了强平衡输沙和不平衡输沙两种情况。同时给出了泥沙在床面静止、滚动、跳跃与悬浮的概率方程和数值结果。引进了挟带分组泥沙的水量百分数,它是研究非均匀沙的重要概念和工具。进而论述不平衡输沙时总挟沙能力、挟沙能力级配及有效床沙级配的方程。证实了床沙质、冲泻质与全沙具有统一的挟沙能力。最后从理论上证明了在河道中粗细泥沙发生交换的现象。The boundary condition at bed surface of diffusion equation of nonuniform sediment is derived based on the concept of exchange intensity of stochastic theory by the author. The theoretical expression of saturation recovery coefficient under the strong equilibrium and nonequilibrium has been obtained. The probability of the fours states of parlicle, including stationary, rolling, jumping and suspension, are calculated. The percentage of flow discharge, which is an important concept and tool for the study of nonuniform sediment, is proposed. The equations for the total carrying capacity and the size distribution of carrying capacity and effective bed material have been presented. It has been proved, the bed material load, wash load and total load follow the same rule of carrying capacity. The exchange mechanism between coarse and fine sediments in the river has been demonstraited theoretically.

关 键 词：非均匀悬移质 不平衡输沙 抉沙能力级配 粗细泥沙交换 恢复饱和系数 

分 类 号：TV14[水利工程—水力学及河流动力学]