基于熵值-理想点法的泥石流危险度研究

Debris Flow Hazard Degree Based on Entropy-Ideal Point Method

泥石流危险度的划分是泥石流研究中的重点与难点,泥石流危险度的确定对于泥石流整体特征的把握具有十分重要的作用。采用熵值-理想点法建立了泥石流危险度划分模型,选取流域面积、主沟长度与泥石流沟相对最大高差等10个评价指标。利用现场3条泥石流沟作为工程评价对象,通过熵值法确定各评价指标的权重系数,并采用理想点法进行泥石流危险度的划分研究。根据模型分析结果,泥石流沟2与3属于高危险度(贴近度为0.79与0.83),泥石流沟1属于中危险度(贴近度为0.82)。泥石流危险度与现场情况及已有研究资料基本一致,证明了该法在泥石流危险度划分中的合理性与有效性。

It is difficult but important to analyze the hazard degree of debris flows,which plays an important role in the grasp of overall characteristics of the debris flow.Entropy-ideal point method was applied to generate a hazard degree classification model,and 10 assessment factors,such as the basin area,main channel length,maximum difference,were used for debris hazard degree assessment.Three debris flow gullies was taken for example.Entropy method was used to determine the weight factors,and ideal method was then applied to analyze the hazard degree of the debris flows.According to the result of the applied method,the hazard degrees of debris flow 2 and 3 were high(close degrees were 0.79 and 0.83,respectively),and the hazard degree of debris flow 1 was moderate(close degree was 0.82).The hazard degree result was accordant with the field and the previous studies.It is proved that this method was able to be applied for hazard degree classification.