分析了泥石流流体和堆积物粒度分布的分形结构特征,其分维值介于2～3之间,平均值分别为2.71和2.65左右。研究了泥石流沟水系的分形特征及其在不同观察尺度下分维的变化特征。结果表明,分维可作为描述泥石流粒度成分和泥石流沟水系的参数,反映了泥石流活动的形成演化特征。在此基础上,论述了分维的研究意义。

In this paper, fractal structure of granulometric distribution of fluid and accumulation in debris flow are analysed based on fractal theory. The Fractal dimensions values of fluid and accumulation of debris flow are between 2 to 3, and its average values are about 2.71 and 2.65. Fractal feature of water system of debris flow gully and its variational situation of fractal dimensions in different observation scales are studied. The results show that fractal dimension can be taken as a parameter describing granulometric composition of debris flow and water system of debris flow gully, reflecting the evolutional property of debris flow activity. The significance of fractal dimension is discussed.