摘要:
在西南地区江河流域,岸坡上常常发育有一系列的凹槽负地形,这些地形呈上宽下窄形态,也就是上部表现出U形洼地,稍显开阔,紧接其下部谷地变窄一直连到江河沟谷边。这样的地貌形态其上部洼地发育的高程一般在1 500~2000m。在以往的地质灾害调查中,这种现象常常被认为是滑坡堆积地貌。本文以金沙江乌东德水电站岸坡槽谷堆积体为主要研究对象,从堆积体地貌、物质结构特征以及对比分析了其成因。最后提出该岸坡槽谷堆积体的成因与冰雪作用有关,而不是简单的滑坡堆积地貌。
Abstract:
In the southwest China,a series of negative groove terrain were often developed on the slope of rivers valleys.These landforms have a sort of pattern:upper wide and narrow lower.In other words,they show that the upper U-shaped canyon and slightly open,then lower valley narrowed has been connected to the river valley edge.The topography of its upper negative groove terrain elevation is around (1?500)～(2?000) m in generally.In the last survey of geological disasters,this phenomenon is often considered as landslide accumulation landform.In this paper,we analyzed the valley slope groove accumulation deposits in the Jinshajiang River of a hydropower station,and proposed the causes and stability evaluation results from the perspective of geological analysis.Finally,according comparative study,the causes of accumulation are related to the processes of ice and snow,and its stability has impacting on the safety of the surrounding construction in varying degrees.
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