基于信息量法和GIS技术的竹山县上庸镇滑坡地质灾害危险性评价研究

Research on Geological Hazard Risk Evaluation of Landslides in Shangyong Town,Zhushan County Based on Information Value Method and GIS Technology

在对上庸镇地质灾害进行野外实地调查和资料收集的基础上,选定坡度、坡向、地层岩性、地质构造、河流水系为基本因子,选定降雨、人类工程活动为诱发因子,以7个评价因子为基础,建立上庸镇滑坡地质灾害危险性评价指标体系,应用信息量法并通过ArcGIS软件完成上庸镇滑坡地质灾害危险性评价。结果表明:研究区内,极高风险区主要分布在堵河及其支流两侧,此区域地质灾害分布较多,危险性较高,其他区域地质灾害分布则相对较少。

Based on the field investigation and data collection of geological hazard in Shangyong town,the slope gradient,aspect,geological lithology,geological structure,and river system are selected as basic factors,and the rainfall and human engineering activities are selected as triggering factors.Based on the seven evaluation factors,the evaluation index system for the geological hazard of landslides in Shangyong town is established.The information value method is applied and the ArcGIS software is used,so as to complete the risk evaluation and research on the geological hazard of landslides in Shangyong town.The results show that:within the research area,the high-risk areas are mainly distributed on both sides of the blocked river and its tributaries.More geological hazard is distributed in this area with higher risk,while the distribution of geological hazard in other areas is relatively less.