摘要
滑坡敏感性制图是灾害防治较为有效的软措施之一。以渝东北三峡库区为例,利用频率比法和投影寻踪模型绘制滑坡敏感性图。首先,针对研究区的地质环境特征建立滑坡敏感性评价指标,并利用频率比法分析历史滑坡与指标之间的空间关系。其次,利用投影寻踪模型确定评价指标的最优向量,将频率比分析结果与最优向量进行加权计算得到滑坡敏感性指数,并将其划分为高敏感区、较高敏感区、中敏感区、较低敏感区和低敏感区。最后,利用接受者操作特征(receiver operating characteristics,ROC)曲线验证了滑坡敏感性制图结果。结果表明,频率比-投影寻踪模型在滑坡敏感性制图中具有良好的性能,样本和验证数据的曲线下面积(area under the curve,AUC)值分别为0.844和0.763。研究区滑坡敏感性以中低风险为主;较高和高风险区面积约占22%,主要分布在忠县、万州以及巫山等区县的人类工程活动集中区。研究结果可为区内灾害防治提供参考,有助于提升三峡库区地质灾害防灾减灾保障能力。
Mapping landslide susceptibility is one of the effective measures for disaster prevention.Taking the Three Gorges Reservoir Area in Northeast Chongqing as an example,the landslide sensitivity map is drawn by using the frequency ratio(FRM)and projection pursuit model(PPM).Firstly,according to the geological environment characteristics of the study area,the landslide sensitivity evaluation index was established,and the spatial relationship between historical landslide and index was analyzed by frequency ratio method.Secondly,the projection pursuit model was used to determine the optimal vector of the evaluation index.The frequency ratio analysis results and the optimal vector were weighted to obtain the landslide sensitivity index,which was divided into high sensitivity area,high sensitivity area,medium sensitivity area,low sensitivity area and low sensitivity area.Finally,the receiver operating characteristics(ROC)curve was used to verify the landslide sensitivity mapping results.The results show that the FRM-PPM has good performance in landslide susceptibility mapping,and the areas under the curve(AUC)of the sample and verification data are 0.844 and 0.763,respectively.The study area is mainly at the level of the low and medium susceptibility zones,and the area of the high and very high susceptibility zones in the study area is about 22%,which mainly distribute in human engineering activities concentrated areas of Zhongxian,Wanzhou,Wushan and other districts and counties.The results could provide reference for disaster prevention and control in the region and help to improve the ability of geological hazards prevention and mitigation in the Three Gorges Reservoir Area.
作者
毛华锐
孙小飞
周颖智
MAO Hua-rui;SUN Xiao-fei;ZHOU Ying-zhi(Chongqing Municipal Bureau of Planning and Natural Resources, Chongqing 401120, China;Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China;Natural Resources and Planning Bureau of Nanchong City, Nanchong 637000, China)
出处
《科学技术与工程》
北大核心
2022年第5期1803-1813,共11页
Science Technology and Engineering
基金
四川省科技计划(20ZDYF1142)。
