模糊综合评价法在余姚江水质评价中的应用

Application of fuzzy comprehensive evaluation method in water quality evaluation of Yuyaojiang river

水体质量受到多种因素的影响,水质分类与评价标准具有复杂模糊性,因此,从众多影响因素中选取溶解氧、高锰酸盐指数、氨氮、总氮、总磷、五日生化需氧量6个组分作为评价因子,构造综合评判模糊数学模型。对余姚江的开丰桥、蜀山大桥、丈亭、姚江大西坝、姚江大闸5个典型监测站的水质进行监测与综合分析评价。结果表明:丈亭、姚江大西坝、姚江大闸监测站的水质基本达到地表水环境质量标准,但其他监测站的水质评价结果不容乐观。该模型操作方法简单、结果可靠。通过水质评价为其合理使用提供指导,可以有针对性的制定江河水质的治理方案。

Water quality is affected by a number of factors,and its classification and evaluation standard are complex and fuzzy.Therefore,this paper constructed a mathematical model based on fuzzy comprehensive evaluation,select six evaluation factors such as dissolved oxygen,ammonia nitrogen,permanganate index,total nitrogen,total phosphorus,five day BOD and so on from many factors.After monitoring and comprehensive evaluation of water quality of the five typical monitoring stations including Kaifeng Bridge,Shushan Bridge,Zhangting,West Dam and Sluice of Yaojiang River,the result shows that water quality at the monitoring stations of Zhangting,West Dam and Sluice of Yao River reaches the environmental quality standard of surface water.However,water quality of other monitoring stations is not optimistic.The operation of this model is simple and reliable.The evaluation of water quality provides guidance for its rational use,so as to specially make a control project of water quality of the river.