青海省玉树州高原暴雨型泥石流形成机制——以称多县拉隆沟泥石流为例  

Formation Mechanism of Rainstorm-induced Debris Flow in Yushu State of Qinghai Province——A Case Study on Debris Flow of Lalong Gully in Chengduo County

作　　者：高波[1,2] 王佳运[1,2] 张成航[1,2] 冯卫[1,2] 

机构地区：[1]国土资源部黄土地质灾害重点实验室,陕西西安710054 [2]中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《水土保持通报》2016年第2期28-31,共4页Bulletin of Soil and Water Conservation

基　　金：中国地质调查局国土资源大调查项目"青海省玉树州地质灾害详细调查"(1212011140143);中国地质调查局地质调查项目(12120111000150022);陕西省自然科学基金项目(2015JM4129);中央高校科研业务费基础研究计划项目(开放基金)(310829161128)

摘　　要：[目的]对青海省玉树州高原暴雨型泥石流形成机制进行研究,旨在为此类泥石流灾害防治及风险减缓提供依据。[方法]以青海省玉树州称多县拉隆沟暴雨型泥石流为例,通过实地调查对其形成因素及形成机制进行研究。[结果]该泥石流主沟道长约3km,流域面积5.25km^2,纵坡比降212‰,高差约600m。物源区发育滑坡方量约为6.50×104 m^3,流域内冲出泥石流物质共约8.5×104 m^3,沟道内物源补给量2.0×104 m^3。[结论]青海省玉树州高原暴雨型泥石流的启动模式可总结为:滑坡—物源形成—固体物质起动—沟道侵蚀—泥石流形成。[Objective]The formation mechanism of rainstorm-induced debris flow in Yushu Plateau of Qinghai Province is researched.Which was expected to provide a basis for the prevention and control of debris flow disaster and reduction of the risk mitigation.[Methods]Through field survey,Lalong debris flow of Chengduo County in Yushu state was selected as an example,and the stimulus factors and mechanism were analyzed.[Results]The main channel length of the debris flow is about 3km,the catchment area is 5.25km2,the longitudinal gradient is 212‰,and the height difference is about 600 m.The volume of the landslide of the source area is about 6.50×104 m3,the volume of the debris flow is about 8.5×104 m3;and the volume of the material in the channel is 2.0×104 m3.[Conclusion]The process of rainstorm-induced debris flow in the study area can be divided into 4stages：landslide-source formation,particle material starting up,gully erosion and debris flow initiation.

关 键 词：青海省玉树州 暴雨 泥石流 形成机制 

分 类 号：P642[天文地球—工程地质学]