摘要
为对比应用信息量法与加权信息量法对地质灾害易发性评价效果,以蕲春县北部地区为例进行研究.对区内地质灾害影响因素分级和相关性分析,确定高程、坡度、坡向、岩土体类型、水系、居民区和公路共7个因子作为区内易发性评价因子.基于以上两种方法,利用ArcGIS平台,对研究区进行地质灾害易发性评价,将研究区分为高易发区、中易发区、低易发区和不易发区.最后通过ROC曲线验证及地质灾害相对百分比指标对比分析两种方法的评价效果,据此选择出较优的易发性评价结果.结果表明,两种方法的评价结果均有较好的准确性,但加权信息量法效果不如信息量法,通过对信息量值加权来达到改进效果并不适用于本次地质灾害易发性评价.因此,在选择加权信息量法进行易发性评价时需要对其评价效果进行对比验证.
In order to compare the susceptibility evaluation results of geological hazards based on information value method and weighted information value method,northern Qichun County was selected as a case study. Seven factors,including elevation,slope angle,slope aspect,rock soil mass types,water system,residential area and traffic roads,were determined as the evaluation factors by classifying and correlation analyzing influencing factors of geological hazards in the area. With the help of ArcGIS,the susceptibility of geological hazards in the study area was evaluated based on the two different methods,and the area was divided into high probability area,medium probability area,low probability area and none probability area. Finally,the evaluation results of the two methods were compared and analyzed by the ROC curve verification and the relative percentage index of geological hazards,which helped to select the better susceptibility evaluation result. The result shows that the evaluation results of the two methods both have good accuracy,but the effect of the weighted information value method is not as good as that of the information value method,and it is not suitable for this case to achieve the improvement effect by weighting the information value. Therefore,it is necessary to verify the evaluation effect of weighted information method when selecting it for susceptibility evaluation.
作者
李雪晗
晏鄂川
张丹
LI Xuehan;YAN Echuan;ZHANG Dan(Engineering Faculty,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《河南科学》
2020年第2期212-220,共9页
Henan Science
基金
国家自然科学基金(41672313)。
关键词
地质灾害
易发性评价
GIS
信息量法
加权信息量法
蕲春县
geological hazards
susceptibility evaluation
GIS
information value method
weighted information value method
Qichun county
