某乡镇地质灾害风险评价

Risk Assessment of Geological Hazards in a Township

针对浙江省山区地质环境条件复杂、台风频繁侵袭、地质灾害频发的特点,本文以浙东南某乡镇为例,将斜坡单元为基本评价单位,在选取适当的评价指标体系对地质灾害时空分布及孕灾规律进行量化分析的基础上完成地质灾害易发性评价,分别开展不同重现期降雨量的地质灾害危险性评价和基于承灾体识别、易损性分析的风险评价,总结提出一条基于GIS的高精度地质灾害风险评价技术路线,可为当前正在开展的地质灾害风险调查评价工作提供一些借鉴。

In view of the characteristics of complex geological environment conditions,frequent typhoons and frequent geohazard in mountainous areas of Zhejiang Province,take a township in southeast Zhejiang as an example,based on the quantitative analysis of the temporal and spatial distribution law of geological disasters by selecting an appropriate evaluation index system,the susceptibility evaluation is completed.Geological hazard risk assessment of rainfall in different return periods and risk assessment based on hazard bearing body identification and vulnerability assessment are carried out.A technical route of geological disaster risk assessment based on high-precision detailed survey is determined.The study can provide reference for the ongoing geological disaster risk investigation and evaluation.