Assessment of Hazard Risk and Regionalization of Collapse Disaster in Yanqing District of Beijing Based on Weighted Information
In the past,most of the researches on the collapse disaster in Beijing concentrated on Miyun and Huairou,while the collapse disaster in Yanqing area was more but less studied.Therefore,the risk of collapse disaster in Yanqing area was evaluated.Comprehensively considering the situation of the study area,the risk assessment index factors of collapse disaster were selected from six aspects:meteorology,hydrology,topography,geological conditions,geological structure,vegetation and human engineering activities.There are 11 evaluation indexes,such as average annual rainfall,distance to water system,slope direction,slope,topographic relief,elevation,geological lithology,distance to fault,normalized vegetation index(NDVI),distance to road,and land use[1].A model based on ArcGIS platform using information volume-analytic hierarchy process(AHP)was established for Yanqing region.The collapse hazard assessment in Yanqing area was completed.The results of collapse hazard evaluation in Yanqing area are divided into four categories:extremely high risk,high risk,medium risk and low risk.The extremely high risk areas accounted for 23.25％of the study area,mainly distributed in Qianjiadian Town,Xiangying Township,Zhenzhuquan Township and other areas.High risk areas accounted for 27.57％of the total area of the study area,mainly distributed in the northeast of Yanqing.The results of risk zoning are consistent with the actual distribution of collapse disaster points.The northern and eastern parts of the study area are densely distributed areas of collapse disasters,and the main influencing factor is the average annual rainfall.
万方数据
