基于信息量模型的赣州市地质灾害易发性分区

Susceptibility Zoning of Geo-hazards in Ganzhou City Based on the Information Model

赣州市地质灾害发育广泛、成因复杂,对当地社会经济发展和人居环境影响深刻。在对赣州市地质灾害情况进行资料收集和野外调查的基础上,确定斜坡几何形态、斜坡结构类型、工程地质岩组等6类影响因素作为该地区地质灾害易发性分区的评价指标;根据专家经验,结合地形地貌等因素,以250m×250m网格尺寸为单元获取指标数据,利用信息量模型和ArcGIS软件的空间分析功能,开展了赣州市地质灾害易发性分区研究;根据分区结果提出了相应的地质灾害防治措施。结果表明:研究区地质灾害可划分为高易发区、中易发区、低易发区3个区及11个亚区,该分区结果与地质灾害实际调查结果基本相符,表明利用信息量模型进行地质灾害易发性分区具有可行性和有效性。研究结果对该地区地质灾害易发性评价及灾害防治具有重要的理论和现实意义。

The geological hazards in Ganzhou City have the characteristics of large proportion, complex cau ses, and profound influence with severe negative impact on the socioeconomic and environmental state of in dividuals and their communities. Therefore,it is urgent to conduct research on preventing and controlling the geo hazards in these areas. On the basis of investigation and data collection, this paper determines the six evaluation indicators of susceptibility zoning of geo hazards, including geometric shape of slope, structure type of slope, engineering geological perrofabic,etc. Then with the experience of experts and in combi nation of topography, by obtaining the analysis data on 250 m ×250 m grids, the paper conducts the suscep tibility zoning of geo hazards in Ganzhou City based on the information value model and ArcGIS. Next the paper proposes prevention measures for geo hazards corresponding to each areas. The results show that the whole research area can be divided into high susceptibility areas,medium susceptibility areas and low susceptibility areas and 11 sub regions, which basically agrees with the practical investigation,indicating that the method is valid and feasible. The study is theoretically and practically significant for the susceptibility zoning and prevention of regional geo-hazards.