基于组合权区间欧式距离模型的重金属污染评价

The Evaluation of Heavy Metal Pollution Based on Interval Euclid Distance Model with Combination Weights

在加权欧式距离模型的基础上,通过对权重赋值和评价准则的改进,提出了组合权区间欧式距离模型。首先对客观信息熵权法进行改进,然后将其与主观层次赋权法结合,同时引入偏好系数进行综合优化得到评价指标的组合权重,依据评价指标的组合权重及其对应的实测数据和分级标准区间,算得样本的欧式距离和评价标准的区间欧式距离,比较两者的相似程度,从而建立起组合权区间欧式距离模型。针对康定城区的土壤重金属污染应用该模型进行综合评价,并与模糊综合评价法的评价结果进行比较,结果与土壤重金属污染的实际情况符合较好,验证了组合权区间欧式距离应用于土壤重金属污染评价的科学性和合理性。

On the basis of the Euclid distance model with weights,and by improving the weighted assignment method and the evaluation criteria,the interval Euclid distance model with combination weights was proposed. Firstly, the objective information entropy method was improved and combined with subjective analytic hierarchy method, while the preference co- efficients were introduced to optimize the combination weights. Based on the combination weights and their corresponding measurement data and classification standard interval values of the evaluation index, the Euclid distance of sample and the interval Euclid distance of the evaluation criteria was calculated out, and both distances are contrasted from its similarity to establish the interval Euclid distance model. The comprehensive evaluation of soil heavy metal data in Kangding City is made with the application of the model, which is compared with that of the fuzzy comprehensive evaluation method. The con- clusion is that the results of the model are consistent with the actual soil contamination of the area, thus verifying that the ap- plication of the Interval Euclide Distance model with combination weights to the evaluation of soil heavy metal pollution is feasible and rational.