基于动态集对分析模型的地下水水质评价

针对以往水质评价中评价指标权重相对固定的不足,提出一种基于动态权重的水质评价方法.首先建立地下水水质评价多指标评价体系,采用熵权法和层次分析法分别计算指标客观权重和主观权重,通过主客观综合赋权确定一个随指标取值变化而变化的指标动态权重.然后将集对分析模型由以往的3元联系度拓展为5元联系度,并将该权重引入改进的集对分析模型,提出基于动态权重的集对分析模型对地下水水质进行评价.将此方法应用于宁夏石嘴山市大武口区地下水水质评价,结果表明:测点1,2,5的水质级别为Ⅰ级;测点3,4,6,7的水质级别为Ⅲ级.结合研究区地质、水文地质条件以及人类活动情况验证评价结果的科学性及合理性,并通过与综合评判法、属性识别法和模糊物元法的评价结果相比较,表明基于动态权重集对分析模型的评价结果客观、合理,具有较好的实用性和科学性.

Groundwater quality evaluation based on dynaset pair analysis model

In terms of the drawback such as relatively fixed weights for evaluation indexes in existing water quality evaluation methods, a water quality evaluation method was proposed based on variable weights. Firstly, a multi-index groundwater quality evaluation system was established. Then, entropy weight method and analytic hierarchy process were used to calculate the objective and subjective weights, respectively. The two weights decided were used to determine the variable weights of an index, which could vary with index itself. Thirdly, the connection number in dynaset pair analysis was extended to 5 from 3, and the variable weights was introduced into this improved set pair analysis model; Eventually, a variable weight-based set pair analysis model was developed to evaluate groundwater quality. This model was applied to assess the quality of groundwater in Dawukou District, Shizuishan of Ningxia. Results show that the quality of the water at monitoring points 1, 2 and 5 is in level I but in level III at monitoring points 3, 4, 6 and 7. These evaluations have accounted for geological, hydrogeological conditions and human activities in the studied areas and are verified to be scientific and reasonable. In comparison with the comprehensive evaluation, attribute recognition and fuzzy matter-element methods, the result evaluated by variable weight set analysis model is more objective and reasonable, and has better practicability and scientificity.