四川“9.5”泸定震后加郡沟流域强降雨前后泥石流物源分析  

Analysis of Debris Flow Source in Jiajungou Watershed before and after Heavy Rainfall after Sichuan Province“9.5”Luding Earthquake

作　　者：唐鹏 许茹 胡正涛 杨曦璃 青佳明 邓辉[3] Tang Peng;Xu Ru;Hu Zhengtao;Yang Xili;Qing Jiaming;Deng Hui(Sichuan Institute of Metal Geological Survey,Chengdu,Sichuan 611730,China;Sichuan Shushui Geological Environment Research Co.,Ltd.,Chengdu,Sichuan 611730,China;College of Geography and Planning,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]四川省金属地质调查研究所,四川成都611730 [2]四川省蜀水地质环境研究有限责任公司,四川成都611730 [3]成都理工大学地理与规划学院,四川成都610059

出　　处：《山西水土保持科技》2024年第3期39-47,共9页Soil and Water Conservation Science and Technology in Shanxi

基　　金：四川省金属地质调查研究所“泸定县2023年地质灾害防治中省资金项目(编号:JSS20230301)”资助。

摘　　要：2022年9月5日,泸定磨西镇发生6.8级地震,强烈地震使得区域内松散固体物源大幅增加。2023年6月26日晚,加郡沟流域内经历短时集中强降雨,爆发了泥石流灾害,严重威胁沟口村民的生命财产安全。通过高清遥感影像数据和现场调查等手段,分析了加郡沟流域在震前、震后、地震暴雨后的物源分布特征和变化规律及地震和降雨对泥石流物源的影响。分析得出,加郡沟沟域物源总量地震后较地震前增加1.9倍,暴雨后较地震前增加12.1倍;板厂沟沟域物源总量地震后较地震前增加1.2倍,暴雨后较地震前增加2.1倍。地震后的泥石流物源量具有极大的隐蔽性和滞后性,地震区根据遥感解译估算泥石流固体物源的方法是可行的。该研究可为震后类似泥石流静储量估算及工程治理提供参考。On September 5,2022,a 6.8 magnitude earthquake occurred in Moxi Town,Luding.The strong earthquake greatly increased the source of loose solid matter in the region.On the evening of June 26,2023,the Jiajungou Valley experienced short-term concentrated heavy rainfall,and the debris flow disaster broke out,which seriously threatened the life and property safety of the villagers in debris flow exit.In this paper,by means of high-resolution remote sensing image data and field investigation,the distribution characteristics and change rules of provenance in Jiajungou Basin before earthquake,after earthquake and after earthquake rainstorm,as well as the influence of earthquake and rainfall on debris flow provenance are analyzed.The results show that the total amount of provenance in Jiajun Valley area increases 1.9 times after earthquake and 12.1 times after rainstorm compared with before earthquake.The total amount of source in Banchanggou area increased 1.2 times after the earthquake and 2.1 times after the rainstorm compared with before the earthquake.The source quantity of debris flow after earthquake has great concealment and lag.It is feasible to estimate the solid source of debris flow based on remote sensing interpretation in earthquake area.This study can provide a reference for estimating the net reserves of similar debris flow after the earthquake and engineering treatment.

关 键 词：泥石流物源特征 “9.5”泸定地震 强降雨 遥感影像 隐蔽性 滞后性 

分 类 号：P237[天文地球—摄影测量与遥感] P642.23[天文地球—测绘科学与技术]