喜德县“6.4”山火泥石流灾害特征与防治建议  

Characteristics of the“6.4”Forest Fire-induced Debris Flow in Xide County and Disaster Preventing Advices

作　　者：吉日伍呷 田宏岭[1] 刘雅琴 JIRI Wu-ga;TIAN Hong-ling;LIU Ya-qin(Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;College of Earth Science, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]中国科学院,水利部成都山地灾害与环境研究所,成都610041 [2]中国科学院大学资源与环境学院,北京100049 [3]成都理工大学地球科学学院,成都610059

出　　处：《科学技术与工程》2022年第17期6880-6887,共8页Science Technology and Engineering

基　　金：国家重点研发计划(2018YFE0100100)。

摘　　要：近年来,四川省凉山州森林火灾频发,导致滑坡和泥石流等次生山地灾害的发生。选择中坝村山火泥石流为对象,结合无人机技术、实地调查、室内分析试验等方法,分析了中坝村拉达沟泥石流的灾害特征、运动学参数及形成机制等。结果表明:拉达沟泥石流容重为1.74 t/m^(3),属于稀性泥石流;拉达沟泥石流中较大石块的冲击力为284.59 kN,泥石流的流量为89.3~107.16 m^(3)/s,平均流速为8.93 m/s;采用单沟泥石流危险度评价方法求得其危险度为0.218。据此预测了拉达沟在未来爆发泥石流的可能性较小,并提出了几点减灾建议,为山区森林火灾及次生灾害的综合防治提供借鉴。In recent year,forest fires occurred frequently in the Liangshan Prefecture,Sichuan Province,which promoting the occurrence of secondary mountain disasters such as landslides and mudslides.Taking the mountain fire debris flow in Zhongba Village as the object,combined with unmanned aerial vehicle technology,field investigation,indoor analysis and test,the disaster characteristics,kinematic parameters and formation mechanism of LADA gully debris flow in Zhongba village were analyzed.The results show the bulk density of the debris flow samples in Lada Gully is 1.74 t/m^(3),implying the Zhongba Village event belonging to non-viscous debris flow.The impact force of large stones during the debris flow process is 284.59 kN,the peak discharge is estimated to be 89.3~107.16 m^(3)/s,and the average velocity is 8.93 m/s.The hazardous degree of debris flows for Lada Gully is 0.218 that estimated by catchment-scale debris flow hazard evaluation model.The repeated possibility of debris flows in the Lada Gully is relatively low.Finally,some disaster reduction suggestions are given for forest fires and secondary disasters in mountainous areas.

关 键 词：森林火灾 山火泥石流 次生灾害 中坝村 

分 类 号：P642.23[天文地球—工程地质学]