基于GIS与信息量模型的地层因素对三峡库区滑坡发育的影响关系

吴彩燕; 乔建平

doi:10.13332/j.1000-1522.2007.06.034

基于GIS与信息量模型的地层因素对三峡库区滑坡发育的影响关系

Relationship between landslide and lithology in the Three Gorges Reservoir Area based on GIS and information value model

摘要

摘要: 三峡库区的滑坡发育与多个因子相关,在它的内部因子中,除了斜坡本身的高差、坡度和坡向等重要因素外,地层因素是一个非常重要的条件.为了研究地层因素与滑坡发育的关系,该文借助于GIS技术,利用信息量模型,重点研究了三峡库区云阳-巫山段地层因素对滑坡发育的影响,定量地给出了二者的相关关系.通过对研究区内205个已有滑坡样本点的细致分析,结果表明,侏罗系遂宁组的J_{3_s}和蓬莱镇组的J_{3_p},以及第三系巴东组的T_{2_b}地层对滑坡的产生最为有利.所得研究结果与实际情况较吻合,为库区以后的规划和土地利用建设提供了参考依据.

Abstract: The development of landslide in the Three Gorges Reservoir Area is related to many factors.Lithology is one of the indispensable internal factors besides relative elevation,slope gradient and slope profile.The authors used information value model with geographical information system(GIS) technology to study how lithology contributed to landslide growth in the Yunyang-Wushan Segment in the Three Gorges Reservoir Area,and the relationship between lithology and landslide growth was quantified.Through the research on 205 landslide examples,it was found that the lithology of J_{3_s},J_{3_p} and T_{2_b} contributed most to landslide.The research results inosculate preferably with the fact.The result of this paper can provide the valid basis to the construction of the Three Gorges Reservoir Area in future.

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