天山阿拉沟泥石流形成的地质地貌条件分析

ANALYIS OF FORMINC CONDITIONS OF DEBRIS FLOW INALAGOU BASIN,TIANSHAN MOUNTAINS

阿拉沟属泥石流多发区,危害严重,它的形成与地质条件,地貌发育和暴雨规模等三大因素息息相关,前者提供物质,后者提供动力,中者控制物质的补给量和搬运条件.这里岩层破碎。新构造活跃,沟谷发育,山地高差大,沟谷纵坡陡,只要有适量的暴雨.就可暴发泥石流.

The harm of debris flow in Alagou Basin is very serious,where debris flows occur fre-quently. The formation of debris flow is relative to the following three factors: (1) the geo-Logical conditions, offering loose materials; (2) the landform formation, contralling supplymaterials and carrying condition; (3) the reinstorm scale, offering power. As long as thereare proper rainstorms, debris flows are likely to form in Alagou Basin because of stratumbroken, neotectonics enliven, valley formed and altitude differences among the mountainsbeen large, topography been precipitous, longitudinal oradients been large. It has directivesignificance knowing the relation among the three factors and their function for predictionand controlling of debris flows.