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A Study on Local Scour of Large-Diameter Monopile under Combined Waves and Current

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  • Hanqiu Liu

    (Ocean College, Zhejiang University, Zhoushan 316000, China
    Yangjiang Offshore Wind Energy Laboratory, Yangjiang 529500, China
    These authors contributed equally to this work.)

  • Zijian Tao

    (Ocean College, Zhejiang University, Zhoushan 316000, China
    These authors contributed equally to this work.)

  • Rongsheng Zhang

    (Ocean College, Zhejiang University, Zhoushan 316000, China
    Yangjiang Offshore Wind Energy Laboratory, Yangjiang 529500, China)

  • Cailiang Zhang

    (Ocean College, Zhejiang University, Zhoushan 316000, China
    Yangjiang Offshore Wind Energy Laboratory, Yangjiang 529500, China)

  • Xiang Sun

    (Yangjiang Offshore Wind Energy Laboratory, Yangjiang 529500, China)

  • Shaotao Fan

    (School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    China Energy Engineering Group Guangdong Electric Power Design Institute Co., Ltd., Guangzhou 510000, China)

  • Ronghua Zhu

    (Ocean College, Zhejiang University, Zhoushan 316000, China
    Yangjiang Offshore Wind Energy Laboratory, Yangjiang 529500, China)

Abstract

The complex-load environment of offshore monopile foundations makes the combination of waves and current, and the variation in water depth, important factors for local scour. A flume test model of flow–pile–soil coupling for large-diameter monopile foundations is established, which comprehensively considers the combined reciprocating action of wave/current and the influence of tide depth. The precision of the experiment is ensured by the extension method of series models. The results show that the local scour caused by tides and the wave–current combination is obviously different from the unidirectional wave–current combination. The equilibrium scour depth obtained by the test is found to have some deviation from the predicted scour-depth equation. The maximum scour depth decreased with the increase in water depth within the range of 3 to 6 times the pile diameter. The bed shear-stress equation was generally consistent with the scouring-depth rule measured by the model, which can be considered to evaluate the rationality of the test results.

Suggested Citation

  • Hanqiu Liu & Zijian Tao & Rongsheng Zhang & Cailiang Zhang & Xiang Sun & Shaotao Fan & Ronghua Zhu, 2023. "A Study on Local Scour of Large-Diameter Monopile under Combined Waves and Current," Sustainability, MDPI, vol. 15(7), pages 1-13, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:7:p:5746-:d:1107081
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    References listed on IDEAS

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    1. Matutano, Clara & Negro, Vicente & López-Gutiérrez, Jose-Santos & Esteban, M. Dolores, 2013. "Scour prediction and scour protections in offshore wind farms," Renewable Energy, Elsevier, vol. 57(C), pages 358-365.
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