| 四川凉山州冕宁县彝海镇“6·26”大型泥石流成因分析 |
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| 引用本文： | 杨柳青,陈容,贺拿,罗南会.四川凉山州冕宁县彝海镇“6·26”大型泥石流成因分析[J].中国地质灾害与防治学报,2023,34(1):94-101. |
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| 作者姓名： | 杨柳青 陈容 贺拿 罗南会 |
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| 作者单位： | 1.河南理工大学土木工程学院，河南 焦作 454000 |
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| 基金项目： | 中国科学院战略性先导科技专项（A类）子课题（XDA23090303）；四川省科技计划资助（2019YFH0040）；河南省博士后经费资助（19030069） |
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| 摘 要： | 2020年6月26日晚21时左右，彝海镇大马乌村和大堡子村爆发大型山洪泥石流，此次泥石流灾害造成重大人员伤亡及财产损失。灾后通过收集当地基础资料，结合现场调访及野外勘察等手段分析泥石流成因：此次泥石流是由于前期地震及人类工程活动影响下，导致该流域松散固体物质丰富且未及时疏通治理；流域中上游坡体坡度较大，地势陡峭，为泥石流发育提供了良好的自然条件，6月26日晚上突降特大暴雨，超出降雨阈值，造成安宁河洪水泛滥，冲毁堤坝，引发特大泥石流。此次泥石流灾害给我们以重大警示：应加强泥石流防灾减灾知识宣传，指导当地居民选择合理场地进行工程活动并及时疏通河道，加强山地灾害监测预警，完善群测群防体系建设。
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| 关 键 词： | 彝海镇 特大泥石流 现场调查 监测预警 群测群防 |
| 收稿时间： | 2021-12-26 |
Analysis of the cause of the“6·26” large debris flow in Yihai Town,Mianning County,Liangshan Prefecture,Sichuan Province |
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| Affiliation: | 1.School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu, Sichuan 610041, China |
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| Abstract: | At around 21 pm on June 26, 2020, a massive debris flow broke out in Damawu Village and Dabaozi Village, Yihai Town. This massive debris flow caused heavy casualties and property losses. After the disaster, the causes of debris flow were analyzed by collecting local basic information, combining it with field investigation and field testing. The debris flow was caused by the early earthquake and human activities, which led to abundant loose solid materials in the basin, and the loose solid materials were not dredged and treated in time. The slope of the upper and middle reaches of the basin is large and the terrain is steep, which provides good natural conditions for the development of debris flow. On the evening of June 26, heavy rain suddenly fell, which surpassed the rainfall threshold and caused the flood of the Anning River to wash away the dam and triggered the massive debris flow. The debris flow disaster gives us a major warning: we should strengthen the publicity of debris flow disaster prevention and mitigation knowledge, guide local residents to choose reasonable sites to carry out engineering activities and dredge the river course in time, strengthen the monitoring and early warning of mountain disasters, and improve the construction of group detection and prevention systems. |
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