Analysis of landslide risk factors and susceptibility evaluation in the middle and low mountainous areas of southern Hunan:Taking Jianghua County as an example
Landslides are one of the most common geological hazards in the middle and low mountainous areas of southern Hunan,with a wide distribution and great harm.Taking Jianghua County as an example,this study explores the landslide risk factors and geological hazard susceptibility evaluation based on RS and GIS.Analysis suggests that five factors,including topography,slope,geological lithology,human engineering activities,and rainfall,are closely related to landslides within the county.The susceptibility index is used to divide the areas into low susceptibility,medium susceptibility,and high susceptibility.The verification results show that in previous years,the proportion of newly developed geological hazard hidden points in Jianghua County falling into medium and high risk areas is greater than 90%.Research has shown that disaster prone factor analysis and susceptibility evaluation can effectively guide field investigation work and provide technical support for geological hazard preven-tion and control management.Further analysis shows that the"6.22"strong rainfall in Jianghua,Weizhukou Town-ship was the most severely affected.Its U-shaped geomorphic features made the area form a local rainstorm center.In addition,the river channel is curved and the drainage is not smooth,resulting in frequent landslide geological disasters and adverse geological phenomena.Research suggests that more analysis should be conducted on the impact of overall terrain on rainfall convergence in low to medium mountainous areas to improve the accuracy of geological hazard prediction.
landslidefactors of the geological hazardssusceptibility assessmentJianghua County
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