Loess Landslide Types and Topographic Features at South Jingyang Plateau, China
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摘要: 1976年泾阳南塬大面积提水灌溉以来，沿泾河右岸发育27处，50余起黄土层内滑坡，造成严重的经济损失和人员伤亡，使得台塬面积不断缩小，水土流失加剧.通过对南塬黄土滑坡多次野外考察和滑坡测量，研究了泾阳南塬黄土滑坡类型与发育特征.依据滑坡发生力学机制对南塬黄土滑坡进行了分类，包括黄土流滑、黄土滑动和黄土崩塌.南塬黄土滑坡具有高陡的后壁，后缘裂缝普遍发育，具有演化性与群体性分布特征.其中裂缝发育及高陡的滑坡后壁是造成滑坡演化的重要因素.裂缝的发育还是滑坡群体性分布的内在动力机制.Abstract: The South Jingyang plateau, which has a total area of 70km2, is located in Shaanxi Province, China. Groundwater table in this loess plateau has been significantly raised since 1976 when the loess cover began to be artificially irrigated. Up to now, more than 50 landslide events at 27 sites have occurred not only resulting in large economic loss and numerous deaths but also exacerbating water and soil erosion that reduced plateau area badly. After filed visits and landslide measurement at South Jingyang plateau, the following types of loess landslides there can be recognized on the basis of the initiative mechanisms: loess flowslide, loess slide and loess fall. We also analyzed the mechanisms of terrain-edge cracks and steep scarp and their relations with group-distribution and retrogressive occurrences of loess landslide. The mechanism of the long runout loess landslide has also been discussed.
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Key words:
- loess landslide /
- landslide types /
- landslide features /
- South Jingyang plateau
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图 3 东风滑坡剖面及实测地形
1.马兰黄土；2.离石黄土；3.阶地砂卵石层；4.古土壤；5.滑坡堆积体
Fig. 3. Profile of Dongfeng loess landslide and topographic 3D scene
图 8 蒋刘滑坡剖面
1.马兰黄土；2.离石黄土；3.阶地砂卵石层；4.古土壤；5.滑坡堆积体
Fig. 8. Profile of Jiangliu loess landslide
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