大渡河叫吉沟泥石流发育特征及危险性分析

Development properties and fatalness analysis of mud-rock fall in Jiaojigou along Daduhe River

叫吉沟位于四川省境内,为大渡河左岸的一级支流。历史泥石流活动明显,沟口公路和村庄都曾遭受其破坏。采用单沟泥石流危险性评价方法,结合遥感图像解译及现场调查,对泥石流的形成条件、类型、危险性进行了分析。根据该沟泥石流发生的特点,对泥石流的工程效应进行了分析,发现该沟是低频的中等易发泥石流,对大渡河和上下水库的影响不大。

Located within the province of Sichuan, Jiaojigou is a first class branch along the left bank of Daduhe River, historical mud-rock fall activity was obvious and the roads and villages were broken by the mud-rock fall. Solo channel mud-rock fall fatalness evaluation was adopted in combination with remote sensing interpretation and field investigation; the authors conducted the analysis on the formation conditions, types and fatalness of the mud-rock fall. Based on the occurrence characteristics of the mud-rock fall in Jiaojigou, the authors analyzed the effect of the mud-rock fall engineering. It was concluded that Jiaojigou was restricted to low frequency and medium liable mud-rock fall, of mild influence to the reservoirs both upper and lower reaches of the Daduhe River.