三峡库区云阳-巫山段坡向因素对滑坡发育的贡献率研究

三峡库区滑坡发育与多种因素相关，在它的内部因子中除了地层、斜坡高差和坡度等重要因素外，斜坡的坡向也是一个不可忽视的条件。为了研究斜坡坡向与滑坡发育的关系，本文借助于GIS技术，利用贡献率法重点研究了三峡库区斜坡坡向对滑坡发育的影响，并且定量地给出了二者的相关关系，即坡向对滑坡发育的贡献。通过对研究区内205个已知的滑坡样本点的细致分析，结果表明：斜坡坡向为朝南（S）和朝东南（SE）方向的贡献率最高；坡向朝西南（SW）和西北（NW）的贡献率中等；坡向朝北（N）和朝东北（NE）、朝东（E）以及朝西（W）的贡献率最低。所得研究结果与实际情况较吻合，为库区以后的规划建设提供了依据。

The Contributing Rate Research of Slope Aspect to Landslide Growth from Yunyang to Wushan in Three Gorges Reservoir Region

Landslides' development in Three Gorges Reservoir area is related to many factors. Slope aspect is one of indispensable internal factors besides lithology, relative elevation and slope degree.The method of contributing rate with Geographical Information System (GIS) technology to study how slope aspect contributes to landslide growth. Through detailed research on 205 landslides examples, it is found that the slope contributes most where aspect is towards south and southeast, and these zones are dominant to develop landslides. Southwest and northwest aspect are the minor zones to landslide development.North, northeast, west and east aspect contribute little to landslides' development. The research result inosculates preferably with the fact. The result of this paper can provide potential gist to the construction of Three Gorges Reservoir area in future.