滑坡灾害坡度坡向敏感性分析研究——以云南大关县为例

Sensitivity Factors of Slope Gradient and Slope Direction of Landslides in Daguan County, Yunnan

借助地理信息系统（GIS）空间分析技术和基于贡献率的敏感性分析方法,分析地形地貌因子与滑坡敏感性之间的关系,研究大关县坡度坡向对滑坡的影响程度的大小。将坡度和坡向因子细分区间,计算每一区间对滑坡的贡献率,定量地分析坡度、坡向区间变化与滑坡发育的关系。研究结果表明,坡度15°~25°区间的区域为滑坡最敏感的区域,坡向带270°~315°区间是滑坡灾害最敏感的区域,但坡向带每一区域的贡献率差别不大,说明坡向对滑坡发生的作用效果不显著。

With the help of GIS spatial analysis technology and sensitivity analysis based on the contribution rate, this paper analyzes the relationship between landform factors and landslide susceptibility in Daguan County, and studies the influence of slope gradient and slope direction of the landslide. The ranges of the slope gradient and slope direction are subdivided into some narrower intervals. To the landslide, the contribution rates of each interval are calculated, and the relationship between interval changes and landslide is quantitatively analyzed. The research results show that 15°-25° gradient interval, 270°-315° slope direction interval, are the most sensitive in landslide disaster, but little difference between the slope direction, namely the slope direction influence to the landslide is not so significant.