|关键词: 城市水质指数 地表水 环境质量评价 城市排名
|The Application of City Water Quality Index to Surface Water Environmental Quality Assessment
WANG Shan-shan，ZHANG Ran，LIANG Yueet al1,2
1. Jiangsu Provincial Environmental Monitoring Center, Nanjing，Jiangsu 210019, China;2. Taihu Water Quality Monitoring Center Station, Nanjing,Jiangsu 210019, China
|City Water Quality Index (CWQI) is an evaluation method to reflect the surface water quality of different basins, areas or cities quantitatively and directly. CWQI and CWQI of different basins or areas in Jiangsu Province was respectively calculated using CWQI method. Results indicated that surface water quality of cities in the south of Jiangsu was better than that in north, surface water quality of Yangtze River basin was better than that of Huai River basin. Results of degree of variation of CWQI(CWQI) of most regions were negative, which showed the improvement of Jiangsu surface water quality. CWQI of city a, located at Yangtze River basin, was positive, indicating surface water quality of this region in the first half of 2020 was worse than that of the corresponding period in 2019. CWQI of TP in Huai River basin varied the most, indicating the obvious TP pollution in this area, which was also consistent with the relevant monitoring results. In addition, based on plenty of calculation, it showed some problems about rounding off of numberical values, detection limits, section base and polarization between CWQI and CWQI when sequencing surface water environmental quality by means of CWQI method. Related solutions and suggestions of different problems were proposed for environmental management department decision making.
|Key words: City Water Quality Index Surface water Environmental quality assessment City ranking