基于集水单元的岩溶山区小流域泥石流敏感性评价——以贵州威宁二塘河流域为例  

Susceptibility assessment of debris flows in small watershed of karst area based on catchment units:a case study in Ertang River Basin,Weining County,Guizhou Province

作　　者：杨宇[1,2] 蔡英桦 钟华介 毛庆亚 YANG Yu;CAI Yinghua;ZHONG Huajie;MAO Qingya(State Key Laboratory for Geo-Hazard Prevention and Geo-Environment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Chengdu Monitoring Station of Geological Environment,Chengdu,Sichuan 610042,China;Sichuan Institute of Land and Space Ecological Restoration and Geological Hazard Prevention,Chengdu,Sichuan 610081,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]成都市地质环境监测站,四川成都610042 [3]四川省国土空间生态修复与地质灾害防治研究院,四川成都610081

出　　处：《中国地质灾害与防治学报》2019年第5期57-64,共8页The Chinese Journal of Geological Hazard and Control

基　　金：国家重点研发计划资助(2018YFC1505205);四川省自然资源科技计划(KJ-2018-23)

摘　　要：本文选取岩溶区小流域,查明了泥石流分布及土壤侵蚀现状,分析了泥石流固体物质来源并对土壤侵蚀模数进行了计算,选取了地形地貌和物源状态两类评价因子,基于集水单元完成了研究区泥石流敏感性评价。结果表明,研究区土壤侵蚀是泥石流的主要固体物质来源,评价结果与泥石流分布特征及活动历史相符合,为指导研究区泥石流防治工作和岩溶区小流域泥石流敏感性评价提供参考。A small watershed in karst region is selected. Based on field investigation,the distribution of debris flows and soil erosion are ascertained. Then,analysis on the solid resource of debris flows and calculation on the soil erosion modulus are carried out. Two kinds of evaluation factors including landform and solid resource were selected to evaluate the sensitivity of debris flows based on catchment units. The results indicate that,soil erosion is the main solid material source of debris flows in the study area. The evaluation results are consistent with the distribution characteristics and activity history of debris flow. The result provides reference for the prevention and evaluation of debris flow in karst area.

关 键 词：岩溶地区 泥石流 土壤侵蚀 集水单元 敏感性评价 

分 类 号：P642.23[天文地球—工程地质学]