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Experimental Study on the Performance of an Innovative Tide-Induced Device for Artificial Downwelling

Author

Listed:
  • Wei Fan

    (Ocean College, Zhejiang University, Zhoushan 316000, China)

  • Dongdong Pan

    (Ocean College, Zhejiang University, Zhoushan 316000, China)

  • Canbo Xiao

    (Ocean College, Zhejiang University, Zhoushan 316000, China)

  • Tiancheng Lin

    (Ocean College, Zhejiang University, Zhoushan 316000, China)

  • Yiwen Pan

    (Ocean College, Zhejiang University, Zhoushan 316000, China)

  • Ying Chen

    (Ocean College, Zhejiang University, Zhoushan 316000, China
    The State Key Lab of Fluid Power and Mechatronic System, Zhejiang University, Hangzhou 310027, China)

Abstract

Hypoxia has been increasingly observed in estuaries and coastal marine ecosystems around the world. In this paper, a tide-powered artificial downwelling device is proposed to potentially alleviate hypoxia in bottom waters. The downwelling device mainly consists of a vertical square tube, a 90° bend sitting on the top of the tube, two symmetrical-guide plates which installed alongside the vertical tube, a static mixer, and an artificial reef. Scale model experiments are performed with respect to different density difference heads, horizontal current velocities, and tube geometries. The results show that the downwelling flow rate is dependent on horizontal current velocity, tube geometry parameters, and the density profile of ambient water. In addition, increasing the equivalent diameter and bend radius of the device can decrease the total loss coefficient in the tube, which in turns enhance the downwelling efficiency. The two symmetrical-guide plates also generate obvious downwelling of surface water which further improves the whole performance of the device. Further work will need to determine the influence of the other parts of the device, such as the static mixer and artificial reef, on the downwelling efficiency.

Suggested Citation

  • Wei Fan & Dongdong Pan & Canbo Xiao & Tiancheng Lin & Yiwen Pan & Ying Chen, 2019. "Experimental Study on the Performance of an Innovative Tide-Induced Device for Artificial Downwelling," Sustainability, MDPI, vol. 11(19), pages 1-23, September.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:19:p:5268-:d:270596
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    References listed on IDEAS

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    1. Liu, Hong-wei & Ma, Shun & Li, Wei & Gu, Hai-gang & Lin, Yong-gang & Sun, Xiao-jing, 2011. "A review on the development of tidal current energy in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(2), pages 1141-1146, February.
    2. Daniel J. Conley, 2012. "Save the Baltic Sea," Nature, Nature, vol. 486(7404), pages 463-464, June.
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    Cited by:

    1. Wei Fan & Weicheng Bao & Yong Cai & Canbo Xiao & Zhujun Zhang & Yiwen Pan & Ying Chen & Shuo Liu, 2020. "Experimental Study on the Effects of a Vertical Jet Impinging on Soft Bottom Sediments," Sustainability, MDPI, vol. 12(9), pages 1-17, May.

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