粤东陆河县地质灾害易发性评价

开展大比例尺高精度的地质灾害评价是当前地质灾害调查所亟需的。根据资料和实地调查,本文以广东汕尾地区陆河县为研究区,从现状地质灾害和潜在地质灾害2个方面选取个数密度、面积密度、体积密度、坡度、断裂密度、岩土体类型、降雨量和人类工程活动8个指标,在ArcGIS软件的支持下,应用地质灾害综合危险性指数法对陆河县的地质灾害及不稳定斜坡的易发性进行区划,评价结果分为高易发区、中易发区、低易发区3级,分区面积为低>高>中,灾害密度为高>中>低,研究所得可作为区域地质灾害风险管理的基础之一。

Susceptibility assessment of geological hazard in Luhe County of eastern Guangdong

It is urgently needed to carry out large-scale and high-precision geological hazard assessment in current geological hazard investigation.According to the data and field investigation,this study takes Luhe County in Shanwei City of Guangdong Province as the research area.Eight indicators are selected from two aspects of current geological hazards and potential geological hazards:number density,area density,volume density,slope,fracture density,rock and soil type,rainfall and human engineering activities,the susceptibility of geological hazards and unstable slopes is analyzed by using the geo-hazards comprehensive hazard index method with the support of ArcGIS software.The evaluation results are divided into three levels:high,medium and low,with the zoning area of low>high>medium and the disaster density of high>medium>low.The research results can be used as one of the bases of regional geological hazard risk management.