冯杭建, 周爱国, 唐小明, 游省易, 徐兴华. 2017: 基于确定性系数的降雨型滑坡影响因子敏感性分析. 工程地质学报, 25(2): 436-446. DOI: 10.13544/j.cnki.jeg.2017.02.022
    引用本文: 冯杭建, 周爱国, 唐小明, 游省易, 徐兴华. 2017: 基于确定性系数的降雨型滑坡影响因子敏感性分析. 工程地质学报, 25(2): 436-446. DOI: 10.13544/j.cnki.jeg.2017.02.022
    FENG Hangjian, ZHOU Aiguo, TANG Xiaoming, YOU Shengyi, XU Xinghua. 2017: SUSCEPTIBILITY ANALYSIS OF FACTORS CONTROLLING RAINFALL-TRIGGERED LANDSLIDES USING CERTAINTY FACTOR METHOD. JOURNAL OF ENGINEERING GEOLOGY, 25(2): 436-446. DOI: 10.13544/j.cnki.jeg.2017.02.022
    Citation: FENG Hangjian, ZHOU Aiguo, TANG Xiaoming, YOU Shengyi, XU Xinghua. 2017: SUSCEPTIBILITY ANALYSIS OF FACTORS CONTROLLING RAINFALL-TRIGGERED LANDSLIDES USING CERTAINTY FACTOR METHOD. JOURNAL OF ENGINEERING GEOLOGY, 25(2): 436-446. DOI: 10.13544/j.cnki.jeg.2017.02.022

    基于确定性系数的降雨型滑坡影响因子敏感性分析

    SUSCEPTIBILITY ANALYSIS OF FACTORS CONTROLLING RAINFALL-TRIGGERED LANDSLIDES USING CERTAINTY FACTOR METHOD

    • 摘要: 本文选择东南沿海地区具有典型降雨型滑坡的淳安县作为研究区,在完成全县地质灾害详细调查的基础上,选取高程、坡度、坡向、曲率、工程地质岩组、距断层距离、距道路距离、土地利用和植被等9个滑坡影响因子,利用GIS技术与确定性系数分析方法,对这9个影响因子开展敏感性分析。研究结果表明:(1) 寒武、震旦、石炭和白垩系是滑坡易发地层,侵入岩组、紫红色砂岩、碳酸盐岩夹碎屑岩、碳酸盐岩为主的岩组是滑坡高敏感性岩组;滑坡受断层影响总体上随着距离断层由近及远逐渐降低;(2) 坡度范围10°~35°是滑坡的易发坡度,30°~35°滑坡数量达到峰值;SE和S等朝南坡向是滑坡最易发坡向;高程范围为100~200m是滑坡最易发区间;凹坡最易发生滑坡,而凸坡则滑坡敏感性最差;非林地、茶叶、竹林和经济林等是滑坡高敏感植被类型;(3) 住宅用地、耕地、园地等与人类活动密切相关的用地类型是滑坡易发地类;距道路距离因子对滑坡敏感性低,相关性不明显。上述各滑坡影响因子最利于滑坡发生的数值区间确定,将为研究区进一步开展降雨型滑坡区域易发性评价及预测奠定基础。

       

      Abstract: Chun'an county is located in southeast China, where is a typical region with extensive occurrence of rainfall-triggered landslides. Based on the results of detailed field investigation of geohazard in Chun'an county, this study applies GIS and Certainty Factor (CF) method to analyze the susceptibility of 9 landslide controlling factors. They include elevation, slope gradient, aspect, curvature, lithology, distance to fault, distance to roads, land use and vegetation. The results from CF analysis show that (1) stratigraphy of Cambrian, Sinian, Carboniferous and Cretaceous, and lithology of the intrusive rock group, red sandstone rock group, carbonatite mixed clasolite rock group, and carbonatite rock group are more susceptible to landslide. The affection of fault to landslide susceptibility in this study area decreases with the increasing of the distance to fault.(2) the areas relatively more susceptible to landslide occurrence include the areas with slope gradient between 10°~35°, aspects of south-facing in south and southeast direction, elevation between 100 and 200m, concave slope and straight slope, vegetation with non-forest, economic forest, tea and bamboo forest. The quantity of occurred landslides reaches to its peak in areas with slope gradient in a range from 30°and 35°.(3) the land use types with extensive anthropogenic activities such as residential land, cultivated land, transportation land and garden are prone to landslides. The controlling factor of distance to roads has less influence on landslide susceptibility and there is no significant correlation between them. This study will facilitate determination of categories with associated numerical intervals of each controlling factor, which is the fundamental in rainfall-triggered landslide susceptibility assessment and spatial prediction.

       

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