基于加权信息量模型的地质灾害易发性评价

Geological hazard susceptibility evaluation based on weighted information model

湘乡市地质灾害频发,对该地区造成了巨大的经济损失和人员伤亡,基于研究区DEM、遥感等数据,利用了ArcGIS软件对湘乡市划分为10 m×10 m的栅格单元,选取了高程、坡度、坡向、工程地质岩组、月平均降雨量等8个指标作为评价因子,通过主客观权重相结合的方法确定了各指标的权重,结合信息量模型计算出研究区各评价单元的信息量值,采用自然断点法将研究区划分为高易发区、中易发区、低易发区,AUC值为0.863,与历史发灾情况吻合,表明了该方法具有较好的评价效果,为后续的防灾减灾提供了理论依据。

The frequent occurrence of geological disasters in Xiangxiang City has caused huge economic losses and casualties in the area.Based on DEM,remote sensing and other data in the study area,ArcGIS software was used to divide Xiangxiang City into grid units of 10 m×10 m.Eight indicators,including elevation,slope,aspect,engineering geological rock formations,and monthly average rainfall,were selected as evaluation factors.The weights of each indicator were determined by combining subjective and objective weights,and the information content values of each evaluation unit in the study area were calculated by combining the information content model.Finally,the natural breakpoint method was used to divide the study area into high prone area,medium prone area,and low prone area,with an AUC value of 0.863,which is consistent with the historical disaster prone area.The situation is consistent,indicating that the method has a good evaluation effect and provides a theoretical basis for subsequent disaster prevention and reduction.