基于GIS的贵州省赫章县滑坡易发性区划研究

Study on Landslide Susceptibility Zoning in Hezhang County of Guizhou Based on GIS

以赫章县高位排查成果资料为依据,以滑坡地质灾害隐患点为研究对象,选取其合适的评价指标与权重计算各单元格易发性综合危险性指数,利用MAPGIS空间分析功能生成赫章县滑坡地质灾害隐患易发程度分区图,其易发区分为:滑坡地质灾害高易发,中易发区及低易发区,面积分别占全县面积的22.27%、49.01%及28.72%,并细分为6个亚区。分区结果与赫章县实际调查滑坡灾害点分布情况基本一致,表明此评价方法的可靠及实用性,其可结合研究区实际地质环境情况为赫章县政府部门防灾减灾及滑坡灾害点预测预报提供一定依据。

Based on results of the high-level survey in Hezhang County and taking the potential danger points of landslide geological hazards as the research object,we choose appropriate evaluation indexes and weights to calculate the comprehensive risk index of susceptibility of each cell.Using the spatial analysis function of MAPGIS,we obtained the zoning map of the potential risk of landslide geological hazards in Hezhang County.Its vulnerable areas can be divided into high-,medium-,and low-risk zones,accounting for 22.27%,49.01% and 28.72% of the county's area respectively,which can be subdivided into six sub-zones.The zoning results are basically consistent with the distribution of landslide hazard points surveyed in Hezhang County,which demonstrate the reliability and practicability of the method.The evaluation results also can provide reference for the zoning evaluation of geological hazards susceptibility in other areas,and meantime,could provide some basis for the government departments of Hezhang County to prevent and reduce disasters,and predict landslide hazards in combination with the actual geological environment in the study area,