青海某沟谷“8·21”泥石流发育特征及危险性评价  

Development characteristics and risk assessment of “8·21” debris flow in a gully in Qinghai Province

作　　者：常文娟 任光明[2] 李畅[2] 刘腾 CHANG Wenjuan;REN Guangmlng;LI Chang;LIU Teng(Shaanxi Qiuhaifiqing Petroleum Technology Co.,Ltd.,Xi'an,Shaanxi 710000,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology),Chengdu,Sichuan 610059,China)

机构地区：[1]陕西秋海汲清石油科技有限公司,陕西西安710000 [2]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059

出　　处：《中国地质灾害与防治学报》2018年第6期33-39,52,共8页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金资助项目(41072229)

摘　　要：泥石流是山区常见的地质灾害类型之一。位于青海省黄河右岸的某沟谷于2016年8月21日暴发一定规模泥石流,严重威胁流域内生产运营与沟口附近人民生命财产安全。通过现场调查、试验与计算,详细分析了本次泥石流的形成条件、发育特征、激发雨量及形成机制,评价了相关的动力学特征;在此基础上,参照单沟泥石流危险性评价中的评价因子,增加了24 h最大降雨量作为本次泥石流危险性评价指标,采用熵权法对该沟谷泥石流危险性进行了评价。研究结果表明:"8·21"泥石流容重为1. 635 t/m3,为稀性泥石流,一次泥石流冲出总量为3. 89×104m3,属中型泥石流,泥石流危险性值为0. 57,属于中度危险。考虑最大降雨量这一影响因子能较合理揭示泥石流的危险性。Debris flow is one of the common types of geological disasters in mountain areas.In a gully located on the right bank of the Yellow River in Qinghai Province,a large-scale debris flow broke out on August 21,2016, which seriously threatened the production operation in the basin and the safety and property of local people. Through field investigation,experiment and calculation,the formation conditions,development characteristics, excitation rainfall and formation mechanism of the debris flow are analyzed in detail,and the related dynamic characteristics are evaluated.On this basis,referring to the evaluation factors of single-ditch debris flow risk assessment,the 24 hours maximum rainfall is added as the risk evaluation index,and the entropy weight method is used to evaluate the risk of debris flow.The research results show that the "8·21"debris flow has a bulk density of 1.635t/m^3,which is a diluent debris flow.The total volume of debris flow is 3.89×10^4m^3,which is a medium-sized debris flow.The risk value of debris flow is 0.57,belongs to moderate risk debris flow.It is more reasonable to reveal the risk of debris flow by considering the maximum rainfall.

关 键 词：泥石流 发育特征 形成条件 危险性评价 

分 类 号：P642.23[天文地球—工程地质学]