泥石流堵江影响因素试验研究

Experimental study on parameters affecting the river-blocking due to debris flow

对影响泥石流堵江的各因素进行了试验研究。结果表明,泥石流入汇角、泥石流与主河的流量比、泥石流入汇总量等的增大有利于堵江现象的发生,而主河宽度和主河比降的增大则不利于泥石流堵江,泥石流密度与主河临界堵江流量呈现一种抛物线性关系。

The parameters affecting the river-blocking due to debris flow at the confluence are studied experimentally in laboratory.The analysis on experimental data shows that the large confluence angle, high ratio of debris flow to main channel flow discharge and large amount of debris flow are in favor of the occurrence of river-blocking.Whereas, the increases of main channel width and channel gradient will reduce the occurrence of river-blocking.The relationship between debris flow density and critical discharge of main channel for occurrence of river-blocking is in a form of parabolic curve.