摘要
云南极端天气气候事件造成了地质灾害发生频发。2018年9月2日云南麻栗坡县猛硐河流域发生特大山洪泥石流灾害,造成10多人死伤,11人失联,建筑损毁、河道淤埋、基础设施破坏,直接经济损失达14亿元。通过对麻栗坡县猛硐“9. 02”河流域泥石流灾害的现场调查,从物源、地形和水源条件入手,分析了灾害特征与形成演化过程。研究表明,降水是泥石流发生的根本原因,造成沟域内岩土体现出崩滑物源、坡面物源和沟道物源三者的启动及链生效应;由于泥石流造成微地貌改变,今后泥石流爆发可能性增大,高频率、中小规模泥石流是泥石流活动的特征。从发展趋势看,该流域正处于泥石流发育阶段,存在发生大规模泥石流的可能性。应及时地进行沟道的治理,并加强监测预警。
Extreme weather and climate events in Yunnan, China,evoked frequent occurrences of geological disasters. On September 2, 2018, a massive debris flow hit the Mengdong River of Malipo County, Yunnan Province, China, causing more than 10 deaths and injuries, 11 missing, and it incurred river channel burial, infrastructure damages, with a direct economic losses amounting to 1.4 billion yuan. Based on field investigation on its source, topography and water source conditions of the debris flow, in this research it identified the geohazard characteristics, formation and evolution process for understanding the geohazard provenance. The research suggested that precipitation is the root cause of the catastrophe, which caused rock and soil instability in gully walls along with shallow geomaterial motivation, and then an ensuing chain-effect of failures in slope source and channel source, eventually contributing to the outbreak of debris flow. Taking the long view of geohazards in the Mengdong basin, it will have been evolved into an active development phase. There will be a great possibility of large-scale debris flow occurring in the nearest future. And high frequency and small or medium-scale debris flows will characterize the geohazards in the basin. The engineered treatment of the channel stability of the Mengdong basin should be carried out in a timely manner, and monitoring and early warning should be strengthened for geohazard prevention and control.
作者
陈志
杨志全
刘传秋
CHEN Zhi;YANG Zhiquan;LIU Chuanqiu(Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;School of Public Safety and emergency management, Kunming University of Science and Technology, Kunming 650093, China;Yunnan Institute of Geological Engineering Survey and Design, Kunming 650041, China)
出处
《山地学报》
CSCD
北大核心
2019年第4期631-638,共8页
Mountain Research
基金
国家自然科学基金(41861134008,41402272)
云南省应用基础研究计划项目(2015FB122)
云南省省级人培项目(KKSY201421016)
云南省教育厅科学研究基金重点项目(2014Z031)~~
关键词
泥石流
降水
特征
猛硐河
debris flow
precipitation
characteristic
the Mengdong River
