摘要
泥石流灾害爆发具有突发性、不易防范、破坏强度大等特点,在未被确定隐患点的沟谷一旦发生泥石流灾害,往往对人民的生命财产造成严重的损害.研究目的是针对泥石流在灾害发育的隐蔽性条件的判别,研究方法是通过对张家口市涿鹿县岔道河村特大型泥石流发育条件(地形条件、物源条件、水源条件)和形成过程的研究,来分析概括出泥石流灾害的隐蔽性条件.研究结果是高植被覆盖率以灌草类植被或是农作物植被为主、沟道松散堆积物厚度较大、小流域气候、降雨次序尤其是连绵小雨后转大暴雨等情况都是泥石流发育的隐蔽性条件,要格外留意泥石流灾害的发生.对泥石流灾害发育的隐蔽性条件分析识别,将为今后的灾害排查提供指导.
Abstract
Debris flow disaster outbreak is characterized by suddenness,difficulty to prevent,high intensity of damage,etc.Once a debris flow disaster occurs in a gully that has not been identified as a hidden site,it often causes serious damage to people's lives and properties.The study aims to discriminate the hidden conditions of debris flow in disaster development.The research method analyzes and outlines the hidden conditions of debris flow disaster by studying the development conditions(topographic conditions,source conditions,water source conditions)and formation process of superlarge debris flow in Chadaohe Village,Zhuolu County,Zhangjiakou City.The results of the study are that the high vegetation cover is mainly shrub and grass vegetation or crop vegetation,the thickness of loose sediment in the channel is large,the climate of the small watershed,and the rainfall sequence especially the continuous light rainfall followed by heavy rainfall,are all hidden conditions for the development of debris flow.We should pay extra attention to the occurrence of debris flow disasters that has hidden conditions.Analyzing and identifying hidden conditions for debris flow disaster development will guide future disaster identification.
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