改进的内梅罗污染指数法在鉴江水质评价中的应用

Application of the Improved Nemerow Index Method to Water Quality Assessment of Jianjiang River

利用改进的内梅罗污染指数法,基于鉴江干流2018年水质监测数据,选取总磷、氨氮、高锰酸盐指数、溶解氧和五日生化需氧量(BOD5)为指标对鉴江干流水质进行综合评价,并与单因子评价法进行对比。结果表明:两种方法的评价结果基本一致,改进的内梅罗污染指数法综合考虑了各个评价指标间的差异性和相对重要性,能够更好地反映评价指标对水质综合污染的影响程度。两种方法的评价结果说明鉴江干流以Ⅲ类水体为主,水质整体较好。

Based on the monitoring data of water quality of Jianjiang River in 2018, the improved Nemerow index method is used to evaluate the water quality of Jianjiang River with total phosphorus, ammonia nitrogen, permanganate index, dissolved oxygen and biochemical oxygen demand (BOD 5) as evaluation index. The paper then compares it with the single factor evaluation method. Results show that two kinds of evaluation methods both have better performance in the evaluation, while the improved Nemerow index method can better reflect the degree of water quality pollution because of its comprehensive consideration of the differences and relative importance of evaluation index. Meanwhile results of both methods indicate that the water quality of Jianjiang River is mainly grade 3.