Development characteristics and main controlling factors of the slope geohazards in Nujiang River section of Sichuan-Xizang traffic corridor
The Three-rivers basin of southeast Tibetan Plateau is of fragile geo-environment,and geohazards occurred frequently in this area.Therefore,multifarious methods such as remote sensing interpretation,field investigation,GIS spatial analysis,certainty factor(CF)analysis and sensitivity index(E)analysis were used to effectively prevent and control the geohazards risk in the Nujiang River section(Luolong-Basu)of the Sichuan-Xizang traffic corridor.There were 992 slope geohazards(landslides,rockfalls,deformed masses)recognized in the study area,the development characteristics of the hazards,such as quantity,scale and failure mode,were analyzed,and the prone zones and main controlling factors of hazards were revealed by using these methods.The researches showed that,elevation of[2 672,4 500)m,slope angle of[20,35)°,and slope aspect at E,SE,S,SW,W were the topographic and geomorphic region prone to hazards.Sandy conglomerate,mudstone and limestone rock group,sandstone and slate intercalated with volcanic rock group,carbonate rock group,sandstone and slate intercalated with coal seam rock group,marble,limestone intercalated with schist rock group,schist,siliceous rock,sandstone and slate rock group,were the rock groups prone to hazards.Distances to faults and rivers less than 1 km were both the susceptible zones of hazards.Among the above,elevation of[2 672,3 000)m,slope angle of[25,35)°,and slope aspect of SW,carbonate rock group,sandstone and slate intercalated with coal seam rock group were the areas of factors that most prone to hazards.The influence of the selected six factors on slope geohazards was as follows:elevation,rock group,slope angle,distance to water system,distance to fault and slope aspect,among which the first five factors were the main controlling factors of hazards.The research results provide a scientific basis for the prevention and mitigation of geohazards in the Nujiang River basin section of Sichuan-Xizang traffic corridor.
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