基于遥感技术的都汶公路地震次生山地灾害分布规律分析  

Distribution Analysis of Mountain Hazards Induced by 5.12 Wenchuan Earthquake along Dujiangyan-Wenchuan Highway Using Remote Sensing

作　　者：苏凤环[1,2] 崔鹏[1,2] 韩用顺[3] 刘应辉[4] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,成都610041 [2]中国科学院成都山地灾害与环境研究所,成都610041 [3]湖南科技大学,湖南湘潭411201 [4]兰州大学,兰州730107

出　　处：《地质科技情报》2009年第2期29-32,共4页Geological Science and Technology Information

基　　金：973项目“汶川地震次生灾害形成机理与风险控制”(2008CB425802);国家自然科学基金项目(40841011);西部交通建设科技项目“震后灾区公路走廊次生灾害危险性评估技术研究”(200831822196)

摘　　要：选择汶川县境内的都汶公路（漩口-汶川路段）作为调查研究对象，利用遥感技术提取公路沿线的各类地震次生山地灾害的分布信息，将灾害，苣分布与海拔高度、坡度和坡向等要素进行叠加分析，获得了次生山地灾害的分布规律，其特点为：①地震次生山地灾害集中分布在映秀-北川断裂与汶川-茂汶断裂之间；②次生山地灾害主要发生在海拔高度1000～2000m的地带；③次生山地灾害主要分布在30～60。的边坡；④地震及余震期间以崩塌、滑坡、滚石为主，后期以泥石流、滑坡为主；⑤次生山地灾害具有沿岷江河谷发育且在河流左右两岸呈不对称分布等特点。The extraction of earthquake-induced mountain hazards using remote sensing imagine has great significance for earthquake relief assessment on bearing capacity of disaster area and reconstruction work after the earthquake. Xuankou-Wenchuan section is selected to be a studied area of the highway in the research. First, the distribution of different kinds of mountain hazards along highway is identified by means of remote sensing technology. The analysis of the relationship between mountain hazards and elevation, slope and aspect, as well as the rules of development and distribution of mountain hazards revelas the following characteristics. （1） The mountain hazards are of diverse types, including collapse, landslide, rockfall, imprisoned lake and debris flow. （2） The hazards mainly occurr in slopes with the altitude 1 000 m to 2 000 m. （3） The gradients of the slope of generating geo-hazard mainly vary from 30 to 60 degrees. （4） The rockfalls of collapse and landslide dominated during the earthquake and aftershocks and debris flows during the anaphase. （5） Mountain hazards developed unsymmetrically along Minjiang River bank.

关 键 词：地震次生山地灾害 汶川地震 分布规律 遥感 都汶公路 

分 类 号：P642.2[天文地球—工程地质学] TP753[天文地球—地质矿产勘探]