| Fuliang County,located in the northeast of Jiangxi Province,is dominated by tectonic erosion mountain.Igneous rocks are widely distributed and highly weathered.Influenced by topographic features,ecological environment and precipitation,geological disasters such as landslides occur frequently.The evaluation of landslide susceptibility can provide scientific basis for landslide early warning and urban and rural planning,and effectively prevent and reduce the losses caused by landslides.This study uses Arc GIS and ENVI to analyze nine evaluation factors,such as elevation,slope,formation lithology,fault structure,normalized difference vegetation index,water system,precipitation,land use type,road,and combines historical landslide data,and quantitatively evaluates the landslide susceptibility of Fuliang County based on AHP-information method,achieved the following results:(1)Most of the landslides in Fuliang County occur in areas with an elevation of 0～400m,a slope of 10-30°,a stratum of Jurassic volcaniclastic rocks,a normalized vegetation index of 0.41～0.72,a distance of 0～400 m from water systems and roads,developed fault structures,abundant precipitation,and forest land.(2)The evaluation factors affecting the formation of landslide in Fuliang County are water system,slope,fault structure,precipitation,normalized difference vegetation index,stratum lithology,road,elevation and land use type.The calculation results of the information method show that the slope information value is the largest,and the rest are fault structure,stratum lithology,precipitation,elevation,water system,land use type,normalized difference vegetation index and road.(3)According to the weighted information value of Fuliang County,the landslide susceptibility is divided into low,medium and high susceptibility areas from low to high.The high-prone areas of landslides are mainly distributed in mountainous areas with large slopes,such as Xihu Township,Huangtan Township,Jiaotan Town,Xingtian Township,Yaoli Town,Ehu Town,Xianghu Town,etc.,with an area of 113.75 km~2,accounting for 3.99%of the total area.The number of landslides is 20,and the density of landslides is 0.18/km~2.The medium-prone areas of landslides are distributed in the whole Fuliang County to varying degrees,covering an area of 1264.42 km~2,accounting for 44.35%of the total area.The number of landslides is 211,and the density of landslides is 0.17/km~2.The low-prone areas of landslides are mainly distributed in the southwest and southeast of Fuliang County,with an area of 1472.54 km~2,accounting for 51.65%of the area of the whole area.The number of landslides is 99,and the density of landslides is 0.06/km~2.(4)According to the evaluation results of the susceptibility zoning,151 building groups are located in the high-prone areas of landslides,accounting for 35.9%of the total building group area.They are the key landslide prevention and control area in Fuliang County,mainly distributed in the south of Fuliang County,with Xianghu Town,Fuliang Town and Shou’an Town accounting for the largest proportion.(5)In this study,the rationality and accuracy of landslide susceptibility evaluation results are tested by using test samples and ROC curve.The results show that the R_Ⅲvalue of the high-prone areas of landslides is 1.50,the R_Ⅱvalue of the middle-prone areas of landslides is 1.45,and the R_Ⅰvalue of the low-prone areas of landslides is 0.06.With the higher grade of the landslide prone level,the R_i value also increases.ROC curve shows obvious convex shape,AUC value is 0.87.The test results show that the landslide susceptibility evaluation results based on AHP-information method are reasonable and accurate,which can provide a basis for comprehensive landslide control measures in Fuliang County. |
PDF Full Text Request