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

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  • Weiwei Song

    (College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
    College of Environment, Hohai University, Nanjing 210098, China)

  • Qing Xu

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China)

  • Xingqian Fu

    (Kewen College, Jiangsu Normal University, Xuzhou 221116, China)

  • Peng Zhang

    (College of Environment, Hohai University, Nanjing 210098, China)

  • Yong Pang

    (College of Environment, Hohai University, Nanjing 210098, China
    Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China)

  • Dahao Song

    (Kewen College, Jiangsu Normal University, Xuzhou 221116, China)

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 ), K ⋅ T = 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 m 3 /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.

Suggested Citation

  • Weiwei Song & Qing Xu & Xingqian Fu & Peng Zhang & Yong Pang & Dahao Song, 2018. "Research on the Relationship between Water Diversion and Water Quality of Xuanwu Lake, China," IJERPH, MDPI, vol. 15(6), pages 1-26, June.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:6:p:1262-:d:152543
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    References listed on IDEAS

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    1. Ruibin Zhang & Xin Qian & Xingcheng Yuan & Rui Ye & Bisheng Xia & Yulei Wang, 2012. "Simulation of Water Environmental Capacity and Pollution Load Reduction Using QUAL2K for Water Environmental Management," IJERPH, MDPI, vol. 9(12), pages 1-18, December.
    2. Min Pang & Weiwei Song & Peng Zhang & Yongxu Shao & Lanyimin Li & Yong Pang & Jianjian Wang & Qing Xu, 2018. "Research into the Eutrophication of an Artificial Playground Lake near the Yangtze River," Sustainability, MDPI, vol. 10(3), pages 1-19, March.
    3. Weiwei Song & Yong Pang & Xiaohuan Shi & Qing Xu, 2018. "Study on the Rectification of Forebay in Pumping Station," Mathematical Problems in Engineering, Hindawi, vol. 2018, pages 1-16, March.
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    Cited by:

    1. Min Pang & Weiwei Song & Yuan Liu & Yong Pang, 2021. "Simulation of the Parameters Effecting the Water Quality Evolution of Xuanwu Lake, China," IJERPH, MDPI, vol. 18(11), pages 1-16, May.

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