To comprehensively understand the characteristics and distribution of geological hazards at the Jinchuan Hydropower Station located upstream of the Dadu River and its surrounding regions,we focused our research on a 40-kilometer section encompassing the dam and reservoir area,main stream,and tributaries.Employing 1∶10 000 high-precision remote sensing image interpretation,unmanned aerial vehicle(UAV)photography,engineering geo-logical surveys,and profile measurements,we classified and quantified geological disasters,and further examined the correlations between geological hazards and various disaster-inducing factors including topography,geological structure,engineering geological rock formations,slope structure,and hydrogeological conditions.Our findings i-dentified 38 geological hazards.The predominant hazard types were debris flows,collapses,riverbank failures,un-stable slopes,and landslides.Debris flows and collapses were the most frequent,constituting 28.9％and 23.7％of the occurrences,respectively.Specifically,collapses,landslides,unstable slopes,deposit bodies,and riverside collapses predominantly occurred in the Dadu River valley at elevations below 2 600 meters.Landslides and unsta-ble slopes typically located at slope gradients between 25° and 45°,collapse-prone areas generally had slopes grea-ter than 50°,and deposit bodies and riverside collapses developed on slopes ranging from 20° to 35°.The majority of geological hazards were found in areas with relief fluctuations between 200 m and 500 m.Significantly,48.1％of the hazards occurred on slopes with planar curvature,while 59.3％were associated with slopes having profile curva-ture.Eight rock groups were identified within the study area,with most geological disasters occurring within 100 meters from the river.These results provide a more scientific and accurate foundation for regional geological disaster prevention and mitigation strategies.
维普
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