正态云模型在地下水水质综合评价中的应用

针对地下水质综合评价问题,建立了基于组合赋权-正态云的综合评价模型。选取氨氮、亚硝酸盐、溶解性总固体、高锰酸盐指数、总硬度、硝酸盐、氟化物、氯化物以及硫酸盐等9个指标作为水质综合评价指标体系,在此基础上建立了相应的评价标准。评价过程中,采用云模型正向发生器计算水质分级评价指标的隶属度,组合赋权法求出各指标权重,根据隶属度矩阵和权重矩阵给出水质分级的确定度并进行综合评价。利用所建立的评价指标体系对北京市朝阳区地下水水质进行了评价,并将评价结果与模糊物元法、投影寻踪法的评价结果以及实际情况进行了对比,结果表明所提方法评价结果最优。

Application of normal cloud model in groundwater quality evaluation

Aiming at groundwater quality evaluation, a comprehensive evaluation model based on normal cloud and entropy weight method was established. And then nine factors such as ammonia nitrogen, nitrite, total dissolved solids, permanganate index, total hardness, nitrate, fluoride, chloride and sulfate were selected to compose the comprehensive evaluation index system based on which relevant evaluation standards were formulated. In the evaluation process, the membership grades of water quality classified evaluation indexes are calculated by forward generator of the cloud model, the weights of indexes are calculated by combination weighing method and the determination degree of water quality grade are determined by the membership matrix and weight matrix. Using the established evaluation system, the groundwater quality in Chaoyang district, Beijing is evaluated and compared with the results of Fuzzy Matter Element Method, Projection Pursuit Method and practical condition. The results show that the result of the evaluation method proposed in this paper is the optimal.