| The hilly area of Henan Province is a second-level landform transition to the third-level landform step in the national landform classification.The complex topography and geomorphology in the area has led to frequent and various geological disasters.In order to reduce the occurrence of geological disasters in this area and provide technical support for disaster prevention and reduction,it is of great theoretical and practical significance to carry out geological disaster risk assessment.The paper collected,combed,and analyzed the detailed survey results and data of 1:50,000 geological disasters in 44 counties and cities in Henan province,and found out the development characteristics and laws of geological disasters in the area.The risk assessment of geological hazards in the study area was performed using ArcGIS as a platform,and the following conclusions were drawn:(1)There are totaling 6,781 geological disasters developed in mountainous and hilly regions of Henan Province,includeing landslides,collapses,debris flows,and ground subsidences,of which there are 3,118 collapses,accounting for 45.98% of the total number of geological disasters,and 2637 landslides,accounting for 38.89% of the total number of geological disasters.415 mudslides accounted for 6.12% of the total number of geological disasters;611 ground collapses accounted for 9.01% of the total geological disasters.Disasters are concentrated and regionally strong.Collapses,landslides,debris flows,and other slope-like geological disasters often occur in mountainous and hilly regions,while ground subsidence is concentrated in mining areas.(2)Landslides,collapses,debris flows,and land subsidence types in the study area are mainly traction landslides,dumping collapses,debris flows,and collapses from mining operations.The scale,disaster and danger of geological disasters are mainly small-scale.(3)Selecting disaster density,slope height,slope,slope type,rock and soil type,water richness,ground motion peak acceleration,fault density,vegetation coverage,rainfall intensity,annual average rainfall,traffic construction,and town and reservoir construction With 13 factors,a risk assessment index system for geological hazards in mountainous and hilly regions of Henan Province was established.(4)The BP artificial neural network method was used to complete the geological disaster risk assessment.The study area is divided into high-hazardous areas,middle-hazardous areas,low-hazardous areas and non-hazardous areas.The area of high hazardous area accounted for 49.52% of the study area;the area of middle hazardous area accounted for 33.20% of the study area;the area of low hazardous area accounted for 12.30% of the study area;the area of non-hazard area accounted for 4.98% of the study area.The high-hazardous areas are mainly distributed along the northern boundary of the study area and in the mountains of western Henan.(5)Selecting the disaster density,slope height,slope,slope type,type of rock and soil,water richness,peak earthquake acceleration,fault density,vegetation coverage,rainfall intensity,annual rainfall,traffic construction,town reservoir construction,population Density,GDP density,arable land density,forest density,traffic density,and reservoir contribution value are 19 factors to establish a geological disaster risk assessment index system.(6)The comprehensive index method is used to assess the risk of geological disasters.The study area can be divided into high wind risk area,middle risk area,low risk area and extremely low risk area.The high-risk area accounted for 16.87% of the study area,the medium-risk area accounted for 28.18% of the study area,the low-risk area accounted for 36.75% of the research area,and the extremely low-risk area accounted for 18.20% of the study area.The high-risk areas are mainly distributed in Xixia County,Luanchuan County,and Lushi County in the mountains of western Henan,Dengfeng City,Xiangyang City,and Xinmi City at the junction of the mountains in the west of Henan and the Huang-Huai-Hai Plain. |
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