基于改进组合赋权物元可拓模型的泥石流危险性评价

Debris flow hazard assessment based on improved matter-element extension model

针对泥石流危险性评价中权重和危险度,基于改进的组合赋权物元可拓评价模型,提出确定权重的优化算法。首先,根据文献分析泥石流危险度的分级标准,建立危险度评价指标,然后结合可拓物元评价理论,针对可拓法各指标权重确定的问题,将层次分析法计算得到的主观权重结合投影寻踪法所得到的客观权重通过距离函数进行耦合,从而获取各指标最终的综合权重,结合投影寻踪法优化蝙蝠算法进行求解,形成泥石流评价的组合赋权物元可拓模型。最后,借助Mat lab语言,调用内嵌工具箱和相应数学函数,编制程序得以实现。结合已有工程实例验证表明:危险性评价与实际工程相符合,评价结果相对合理,具有一定的工程应用价值。

As weight is an important issue in hazard assessment of debris flow,an optimized algorithm to determine weight reasonably was proposed in this paper based on an improved combination weighting matter-element extension model.Firstly,we suggested a classification standard for debris flow hazards based on literature,and established indices for hazard assessment.Then,based on the matter-element extension evaluation theory,in order to determine the weight of each index of this method,we coupled the subjective weight calculated by analytical hierarchy process and the objective weight calculated by projection pursuit method using a distance function,and obtained the final comprehensive weight of each index.We used the bat algorithm optimized by projection pursuit method to solve the problem,and established a combination weighting matter-element extension model for debris flow assessment.Finally,we composed a program to realize this algorithm in the Mat lab language using the built-in toolbox and related mathematical functions.We compared the results from this algorithm with existing projects,and found that the assessment conclusion was reasonable,proving the method to be of certain application value.