长白山火山泥石流分布影响因子权重分析

利用层次分析法对长白山天池火山泥石流分布影响因子的权重进行了分析。将对长白山天池火山泥石流分布影响作为评价目标,将地质条件、地形地貌以及植被覆盖情况作为第一层次的评价因子,地层年代、地层岩性、风化程度、堆积厚度、高程、相对高差、纵坡比、植被类型、覆盖程度作为第二层次的评价因子,由评价目标以及2个层次的评价因子构成了层次结构模型。通过层次结构模型建立了2个层次的4个判断矩阵,通过对判断矩阵的计算,最终得到了各因子对长白山火山泥石流分布影响的权重值。其中地形地貌中的相对高差及纵坡比对长白山火山泥石流分布的影响最大。

Weight Analysis of Lahar Distribution Influence Factors in Changbai Mountain Area

Changbaishan Tianchi lahar distribution influence factor weights are analyzed by using the Analytic Hierarchy Process.Using Changbaishan Tianchi lahar distribution influence as evaluation target and taking the geological conditions,topography and vegetation coverage as the first level of evaluation factors and stratigraphic age,lithology,degree of weathering,accumulation thickness,height,relative height,longitudinal gradient,vegetation type and coverage as the second level of evaluation factors,the hierarchical structure model is constituted by the evaluated-goal and the first and second levels evaluation factors.With the hierarchical structure model,a four judgment matrixes are established for the two levels.With the judgment matrixes calculation,the weight value of the influence factors of Changbai mountain lahar distribution is obtained.The results show that the relative height difference of landform and longitudinal gradient in volcanic debris flow in the distribution of the Changbai Mountain is the largest.