Evaluation of Landslide Disaster Susceptibility in Ionic Rare Earth Mining Area in Southern Jiangxi Province—A Case Study of Dingnan County
Southern Jiangxi Province is an area of intensive distribution of ionic-adsorption rare earth deposits in China.While rare earth mining has made important contributions to local economic and social development,it has also caused a series of ecological and environmental problems,such as slope stability weakening.Dingnan County of Jiangxi Province,an ionic rare earth high-intensity mining area,was selected as the study area.Based on 538 historical landslide disaster points data,nine impact factors including elevation,slope,aspect,normalized difference vegetation index(NDVI),topographic wetness index(TWI),distance to rivers,distance to roads,stratum lithology and land-use type were selected to construct the landslide susceptibility evaluation index system.The weighted information value model was used to divide and evaluate the landslide susceptibility,and the ROC curve was used to test and compare the prediction ability of the model.The results show that slope,stratum lithology,distance to roads and distance to rivers are the dominant factors for landslides.Both the information value model and the weighted information value model exhibit high prediction accuracy,with the extremely high and high susceptible areas showing good agreement with the actual distribution of historical landslide disaster points.The extremely high and high susceptible areas of the information value model account for 33.80％of the total area,including 86.24％landslide disaster points,with a density of 2.55 disaster points/km2.The extremely high and high susceptible areas of the weighted information value model account for 25.50％of the total area,including 81.97％landslide disaster points,with a density of 3.21 disaster points/km2.The prediction accuracy of the weighted information value model is better than that of the information value model,and the AUC value is increased by 0.042,which is more suitable for the evaluation of landslide susceptibility in ionic rare earth mining areas.
Ionic rare earthLandslide disasterSusceptibility evaluationWeighted information value
万方数据
维普
