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Int. J. Environ. Res. Public Health 2018, 15(6), 1262; https://doi.org/10.3390/ijerph15061262

Research on the Relationship between Water Diversion and Water Quality of Xuanwu Lake, China

1
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
2
College of Environment, Hohai University, Nanjing 210098, China
3
School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China
4
Kewen College, Jiangsu Normal University, Xuzhou 221116, China
5
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
*
Authors to whom correspondence should be addressed.
Received: 9 May 2018 / Revised: 11 June 2018 / Accepted: 12 June 2018 / Published: 14 June 2018
(This article belongs to the Section Environmental Science and Engineering)
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Abstract

Water diversion is often used to improve water quality to reach the standard of China in the short term. However, this large amount of water diversion can not only improve the water quality, but also lead to a decline in the water quality (total phosphorus, total nitrogen) of Xuanwu Lake. Through theoretical analysis, the relationship between water quality and water diversion is established. We also found that the multiplication of the pollutant degradation coefficient (K) and the water residence time (T) is a constant (N), KT=N. The water quality changed better at first, with the increase of inflow discharge, and then became worse, and the optimal water quality inflow discharge is 180,000 m3/day. By constructing two-dimensional hydrodynamic and water quality models, the optimal diversion water plan is calculated. Through model calculations, it can be seen that reducing the inflow discharge makes the water residence time longer (15.3 days changed to 23.8 days). Thereby, increasing the degradation of pollutants, and thus improving water quality. Compared with other wind directions, the southwest wind makes the water quality of Xuanwu Lake the most uniform. The concentration of water quality first became smaller and then became larger, as the wind speed increased, and eventually became constant. Implementing these results for water quality improvement in small and medium lakes will significantly reduce the cost of water diversion. View Full-Text
Keywords: water diversion; degradation coefficient; model simulation; optimal plan; water quality improvement water diversion; degradation coefficient; model simulation; optimal plan; water quality improvement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Song, W.; Xu, Q.; Fu, X.; Zhang, P.; Pang, Y.; Song, D. Research on the Relationship between Water Diversion and Water Quality of Xuanwu Lake, China. Int. J. Environ. Res. Public Health 2018, 15, 1262.

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