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[1]LI Yifei,LIU Yanguo,LIANG Liping,et al.Assessment on Hazard of Geological Disasters in Alpine and Canyon Landforms of Qinghai-Tibet Plateau[J].Research of Soil and Water Conservation,2021,28(03):364-370.

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Assessment on Hazard of Geological Disasters in Alpine and Canyon Landforms of Qinghai-Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 03 Page number: 364-370 Column: Public date: 2021-04-20

Title:: Assessment on Hazard of Geological Disasters in Alpine and Canyon Landforms of Qinghai-Tibet Plateau

Author(s):: LI Yifei¹, LIU Yanguo², LIANG Liping¹, LI Jingji^3,4; (1.College of Earth Sciences,Chengdu University of Technology,Chengdu610059 China;2.Southwest University of Science and Technology, Mianyang,Sichuan621010,China;3.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology, Chengdu610059,China;4.College of Ecology and Environment,Chengdu University of Technology,Chengdu610059,China)

Keywords:: geological disasters; hazard assessment; information method; Yajiang County

CLC:: P694

DOI:: -

Abstract:: In order to provide a theoretical basis for construction of the Yajiang County, the risk zoning was carried out in Yajiang County. With the help of Google image interpretation, 224 geological disasters such as collapses, landslides and debris flows in Yajiang County were obtained. The evaluation index system was constructed by lithology, soil, land use type, slope, aspect, normalized difference vegetation index(NDVI), distance to river, distance to road and precipitation. Disaster risk zoning was carried out through the information content model and the ArcGIS spatial analysis platform. The results show that the extremely high and high-risk areas in the study area accounted for 4.53% and 9.89% of the total study area, respectively; a total of 170 geological disaster sites fell in extremely high and high-risk areas accounting for 75.89% of the total sample disaster points; geological disasters mainly distributed on both sides of rivers and roads where faults are developed and rock mass is relatively broken. The test was performed by the offline area(AUC)of the receiver operating characteristic curve(ROC), and its value was 0.909, and the evaluation model was excellent in accuracy. The results of geological hazard assessment can provide reference for disaster prevention and reduction in Yajiang County and geological hazard assessment in the southeastern margin of Qinghai-Tibet Plateau.

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Last Update: 2021-04-20