基于频率比-投影寻踪模型的渝东北三峡库区滑坡敏感性制图

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...

Mapping landslide susceptibility of the Three Gorges Reservoir Area in northeast Chongqing using the frequency ratio and projection pursuit model

Mapping landslide susceptibility is one of the effective measures for disaster prevention. The purpose of this paper is to draw a landslide susceptibility map for the Three Gorges Reservoir Area in northeast Chongqing by using the frequency ratio (FRM) and projection pursuit model (PPM). First, the landslide susceptibility evaluation indicators were constructed according to the geological environment characteristics of the study area, then the spatial relationship between historical landslides and the indicators was analyzed by the FRM method. Second, the optimal vectors of the indicators, which were determined as weight by the PPM, and the weighted sum of the analysis results from FRM and optimal vectors were used to obtain the landslide susceptibility index, then as a result the study area was divided into five zones, i.e., very high, high, medium, low, and very low susceptibility zone. Finally, the results of landslide susceptibility mapping were validated by the receiver operating characteristics (ROC) curve. 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 of this paper 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.