清江流域滑坡灾害地形因子敏感性分析

滑坡从孕灾到成灾的演化过程与其所处的地质环境密切相关，其中对地形因子具有较高的敏感性。基于GIS和RS研究技术，以清江流域宣恩县为研究对象，选取坡度、坡向、地形起伏度和平面曲率等4个地形要素作为敏感性分析评价因子，分别采用敏感性系数法和条件概率法进行敏感性分析对比研究。研究结果表明：两种分析方法所获得的敏感性分区面积基本接近，且与地表地质调查的滑坡信息基本相同。可为类似宣恩县这种中小区域滑坡灾害评价和预测提供新的思路和参考，且对中小区域防灾和规划具有一定的宏观决策意义。

Sensitivity analysis of topographic factors of landslide disaster in Qingjiang River Basin

The evolutionary process of landslide from disaster-pregnant to disaster-forming is closely related to the geological environment around,especially to the topographic factors.Targeted by Xuan’en County in Qingjiang River Basin,four topographic factors including slope,slope direction,amplitude of undulating terrain and topographic curvature are taken as evaluation factors for sensitivity analysis based on GIS and RS technology.Moreover,the comparative study of the sensitivity analysis is conducted by adopting the methods of sensitivity coefficient and conditional probability model respectively.The results show that the division area of sensitivity by these two methods is basically approximate and the area is fundamentally same to the landslide information of geological survey of earth surface.The research thought and results can give a new thought and references for evaluation and forecast of landslide disaster of medium and small area such as Xuan′en County,and it can also have some macroscopic decision-making significance for disaster prevention and area programming.