三峡、丹江口水库运行前后坝下游不同河型稳定性对比分析

通过计算丹江口、三峡水库运用前后坝下游不同河型的河床稳定系数,分析了建库前后坝下游河床稳定性的变化情况及不同河型稳定性的差异,结果表明:坝下游不同河型的综合稳定系数表现为,分汊河型的稳定系数最大,蜿蜒河型次之,游荡河型综合稳定系数最小;同一河型在不同的河流甚至同一河流不同河段上的综合稳定系数存在差异;丹江口、三峡水库运用以后坝下游不同河型的综合稳定系数均呈增大趋势,河道总体呈现渐趋稳定的态势。

Comparative analysis of river bed stability of different river patterns below reserviors before and after commissioning of Three Gorges Project and Danjiangkou Project

By calculating the coefficients of river bed stability in channels below reserviors before and after commissioning of the Three Gorges Project and the Danjiangkou Project,the change of the river bed stability and the differences of the river bed stability of the different river patterns are analyzed in this paper.The results show that the integrated coefficients of river bed stability of different river patterns are different;in general,the stable coefficient of the braided river pattern is the biggest,followed by the meandering river pattern,and the wandering river pattern is the smallest.The integrated stable coefficients of the same river pattern in different rivers or even in different reaches in the same river are different.The river bed stability of channels below reserviors shows an increasing trend after commissioning of the Three Gorges Project and the Danjiangkou Project,and the river channel is gradually stablilized as a whole.