关键词: 水质评价, 粗糙集, 信息熵, 指标权重, 评价方法, 水环境管理

Abstract: Water quality assessment is the basis of water environment management and protection. Objectively setting the weights of water quality evaluation indexes is the key and difficult point of water quality assessment. The improved weight determination method based on rough sets and conditional information entropy were applied to water quality assessment for the first time. The weight of each water quality evaluation index was determined scientifically and effectively. The water quality evaluation model based on rough set and conditional information entropy were further established. The application results show that the assessment results by this method are more scientific and reasonable, and can further give a fine classification of water quality at a same level. This method provides a new idea for water quality monitoring and evaluation.

Key words: rough set, information entropy, water quality assessment indicator weight, assessment method, water environment management