Open AccessRisk Analysis of Geological Disasters in Southwest China
Author(s) -
Chao Zhang,
Tingxin Qin,
Dong Huang,
Wan Wang,
Fengjiao Xu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/474/4/042023
Subject(s) - elevation (ballistics) , china , physical geography , grading (engineering) , geography , risk assessment , normalized difference vegetation index , population , environmental science , hydrology (agriculture) , geology , climate change , civil engineering , environmental health , archaeology , mathematics , medicine , oceanography , geometry , computer security , geotechnical engineering , computer science , engineering
In this study, four provinces (cities) in southwest China were taken as the study area, and eight risk evaluation indexes were selected to construct the evaluation index grading system, including elevation, slope, relative elevation, soil erosion, annual precipitation, NDVI, land use and population. The analytic hierarchy process was used to obtain the weight coefficients of each evaluation index, a geological hazard risk assessment model for the study area was established, and spatial calculation and visual expression were performed by ArcGIS. The results shows that the area of moderate-risk is the largest, accounting for 37.46% of the total area; followed by the low-risk area, which accounts for 23.89%; the proportions of high-risk areas and extremely high-risk areas are 23.59% and 15.07%.According to the risk analysis results, the geological disasters area with high risk include southwest Yunnan, central Sichuan, southwest Guizhou and northeast Chongqing.