基于灰色局势决策和组合赋权法的再生水评价

Reclaimed water assessment based on gray situation decision and combination weighting method

在水资源短缺和水环境污染的现状下,再生水作为一种非常规水资源,其作用日益突显。针对目前再生水评价模型存在的指标体系单一及权重计算不合理等问题,建立包含16项指标的再生水综合发展能力评价模型。采用灰色局势决策法进行模型的计算,并引入改进的指数型白化函数,可避免有用信息丢失并解决了零权重的问题;采用层次分析法与熵值法相结合的组合赋权法计算指标权重;建立起基于改进的灰色局势决策法和组合赋权法的再生水综合发展能力评价模型。通过云南省3个城市的资料对该模型的合理性进行验证。结果表明:3个市的再生水综合发展能力为K市>Y市>L市,评价结果与实际情况相符,表明该模型适用于再生水综合发展能力评价。

Reclaimed water as an unconventional water resource plays an increasingly important role under the present situation of water resources shortage and water pollution. Aiming at the problem of single index system of the current reclaimed water evaluation and the irrationality of the weight calculation,a reclaimed water comprehensive development capacity model was established in this paper which contained16 indexes and the improved gray situation decision method and combination weighting method were used to calculate the model. The exponential whitenization function was introduced to avoid the loss of useful information and solve the problem of zero weight. And the weight of each index was calculated by the combination weighting method which combined with AHP method and entropy method. Based on the improved grey situation decision method and combination weighting method,the evaluation model of comprehensive development capability of reclaimed water is established. The validity of the model was verified by an example of three cities in Yunnan Province. The results showed that the assessment of the comprehensive development capacity of reclaimed water in the three cities is K〉 Y 〉 L,which are consistent with the actual results,indicating that the model is suitable for evaluating the comprehensive development ability of reclaimed water.