GIS-based Risk Assessment Of Landslides In Jingning County

Jingning County is located in the south-central part of Gansu Province.The landforms are complex and landslide disasters are widely distributed.Landslide geology disasters threaten the safety of life and property of the local people.Therefore,carrying out geological disaster risk assessment is very important for local urban planning and economic development..According to statistics,there are 202 landslide geological disasters in Jingning County,and the local area is densely developed.In-depth studies on the influencing factors and spatial distribution of landslide geological hazards in the region and comprehensive assessment of hazards:(1)Determine evaluation factors for the study area and construct a database.Based on the spatial management,spatial analysis,storage and extraction functions of GIS technology,the on-site geological data and DEM data obtained are processed.Eight factors affecting slope,aspect,elevation,rock formation,fault,water system,road,and rainfall are selected.,build database.(2)Analysis of distribution characteristics and development characteristics of landslide geological hazards in the study area.Studying the relationship between evaluation factors and landslide-prone geological disasters,taking the percentage of disasters per unit area and the percentage of disaster points in each grading interval as the reference,the distribution and development characteristics of landslide geological hazards in the study area were studied.Summarized.(3)Landslide geological disaster risk zoning evaluation and inspection.The risk zoning and evaluation of Jingning County were carried out by means of hierarchical fuzzy comprehensive evaluation method and hierarchical entropy variable weight method.The comprehensive evaluation results obtained by the two evaluation methods were checked and compared with the accuracy of the AUC curve offline area,and Jingning County was obtained.Landslide geological disaster comprehensive evaluation of the regional results,and put forward protective measures.