利用改进的内梅罗指数法模型评价苏州市内外城河水质

Evaluation of Water Quality of City River in Suzhou by Improved Nemerow Index Method

采用改进的内梅罗指数法评价苏州市内外城河的水质污染状况。计算水质的分级标准临界值,以此作为评价水质污染状况的依据。研究结果表明,苏州市内外城河6个采样点的水质污染状况不同,各个点位的水质随时间变化显著(5月、9月、11月较好)。通过Pearson相关性分析可知,影响水质的主要因素是营养元素(氨氮、总氮和总磷)及重金属(6价铬)。对比改进前后的两种评价方法,改进的内梅罗指数法对水质污染状况的评价更为科学客观。

The water pollution situation of city river in Suzhou was evaluated by improved Nemero index method. Based on calculating the criteria for the classification of water quality, the data were used to evaluate water pollution. The results showed that the water quality was different between six points of city river in Suzhou. Each point of the water quality varied significantly with time （May, September and November were better）. By Pearson correlation analysis results, the main factors affecting the water quality were the nutrients （ammonia, total nitrogen and total phosphorus） and heavy metals （hexavalent chromium）. Comparison of the two evaluation methods of water pollution, improved Nemerow index method was more scientific and objective.