西南山区暴雨泥石流沟简易判别方案

A SIMPLE DISCRIMINANT PLAN OF RAINSTORM DEBRIS FLOW VALLEY IN SOUTH-WEST MOUNTAIN AREA

本文以成昆铁路140条沟谷为样本,优选年最大24小时降雨量多年平均值、沟谷纵剖面形态指数、单位流域面积内松散固体物质动储量、岩性、断裂长度和流域林地率等6个可室内作业的指标,建立了暴雨泥石流沟的简易判别方法,正确率达82％。试用于南昆铁路宜良南盘江、红果段家河段,结果符合实际。

As samples with 140 valleies along Chendu-Kunming railway, the paper chooses 6 indexs working indool, which are the mean value of annual most 24 hours precipitation, the dynamic reserve of solid loose mass on an unit basin area, the lithology, the length of fault and the rate of forest area in the basin, and advances the simple discriminant method of rainstorm debris flow valley, the right rate of which is 82%. Results trying out the method accord with reality in areas of Nanpanjiang river in Yiliang and Duanjiahe river in Hongguo along Nanning-Kunming railway.