基于综合危险性指数法的光明区地质灾害易发性和危险性分区评价

Evaluation of Geological Disaster Vulnerability and Risk Zoning in Guangming District Based on Comprehensive Risk Index Method

【目的】评价光明区地质灾害易发性及危险性,为开展工程建设活动提供依据。【方法】在充分调查地质环境条件和发灾特征的基础上,确定各地质灾害致灾因子权重,对光明区进行网格单元剖分,利用GIS空间分析功能,按照综合指数法进行计算出各单元格影响因子加权和,依据分区标准对易发性进行区域划分,得到地质灾害易发性分区。将区域危害程度和易发性叠加计算,最终得到危险性分区。【结果】将光明区按地质灾害易发性划分为中易发区、低易发区及不易发区;按地质灾害危险性划分为中危险性区及低危险性区,分区结果与野外调查情况相符。【结论】通过综合危险性指数法得出的地质灾害易发性及危险性分区可以为本区地质灾害防治工作及区域规划提供科学依据与技术支撑。

[Purposes]This paper aims to evaluation of geological disaster vulnerability and risk Zoning in Guangming District,and provide basis for carrying out engineering constraction activities.[Methods]On the basis of a full investigation of the geological environment and disaster characteristics,determine the weight of the disaster causing factors of each geological disaster.After meshing the Guangming Dis⁃trict cells,through GIS spatial analysis software,calculations are carried out according to the comprehen⁃sive index method,the weighted sum of the impact factors for each cell is obtained,and then,the vulner⁃ability is zoned according to zoning criteria,we get the vulnerability zoning of Guangming District.Through the superposition calculation of hazard extent and vulnerability,finally,the danger partition of Guangming District is obtained.Zoning results are consistent with the field investigation.[Findings]The Guangming area is divided into medium-prone area,low prone area and non-prone area according to the susceptibility of geological disasters,according to the risk of geological disasters,it was divided into me⁃dium risk area and low risk area,and the zoning results were consistent with the field survey.[Conclu⁃sions]The geological hazard susceptibility and risk zoning obtained by the comprehensive hazard index method can provide scientific basis and technical support for the prevention and control of geological disasters and regional planning in the region.