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Research into the Eutrophication of an Artificial Playground Lake near the Yangtze River

1
College of Engineering, Cornell University, Ithaca, NY 14850, USA
2
College of Environment, Hohai University, Nanjing 210098, China
3
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
4
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
5
School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 219 Ninliu Rd., Nanjing 210044, China
6
School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China
*
Authors to whom correspondence should be addressed.
Sustainability 2018, 10(3), 867; https://doi.org/10.3390/su10030867
Received: 5 January 2018 / Revised: 15 March 2018 / Accepted: 16 March 2018 / Published: 19 March 2018
(This article belongs to the Collection Eutrophication and Sustainable Management of Water)
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Abstract

Water pollution in urban rivers is serious in China. Eutrophication and other issues are prominent. Taking the artificial Playground Lake in Zhenjiang as an example, a numerical model combining particle tracing, hydrodynamics, water quality and eutrophication was constructed to simulate the water quality improvement in Playground Lake with or without water diversion by pump and sluice. Simulation results using particle tracking showed that the water residence time depended on wind direction: east wind, 125 h; southeast wind, 115 h; south wind, 95 h. With no water diversion, the lower the flow velocity of Playground Lake under three wind fields, the more serious the eutrophication. Under pump diversion, the water body in Playground Lake can be entirely replaced by water diversion for 30 h. When the temperature is lower than 15 °C, from 15 °C to 25 °C and higher than 25 °C, the water quality can be maintained for 15 d, 10 d and 7 d, respectively. During high tide periods of spring tides in the Yangtze River from June to August, the water can be diverted into the lake through sluices. The greater the Δh (the water head between the Yangtze River and Playground Lake), the more the water quality will improve. Overall, the good-to-bad order of water quality improvements for Playground Lake is as follows: pumping 30 h > sluice diversion > no water diversion. This article is relevant for the environmental management of the artificial Playground Lake, and similar lakes elsewhere. View Full-Text
Keywords: hydrodynamic; numerical simulation; eutrophication; water diversion hydrodynamic; numerical simulation; eutrophication; water diversion
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Pang, M.; Song, W.; Zhang, P.; Shao, Y.; Li, L.; Pang, Y.; Wang, J.; Xu, Q. Research into the Eutrophication of an Artificial Playground Lake near the Yangtze River. Sustainability 2018, 10, 867.

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