Volume 15 Issue 1
Mar.  2022
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Song-gui Chen, En-yu Gong, Xu Zhao, Taro Arikawa, Xin Chen. 2022: Large-scale experimental study on scour around offshore wind monopiles under irregular waves. Water Science and Engineering, 15(1): 40-46. doi: 10.1016/j.wse.2021.12.003
Citation: Song-gui Chen, En-yu Gong, Xu Zhao, Taro Arikawa, Xin Chen. 2022: Large-scale experimental study on scour around offshore wind monopiles under irregular waves. Water Science and Engineering, 15(1): 40-46. doi: 10.1016/j.wse.2021.12.003

Large-scale experimental study on scour around offshore wind monopiles under irregular waves

doi: 10.1016/j.wse.2021.12.003
Funds:

This work was supported by the National Natural Science Foundation of China (Grants No. 52001149, 52039005, and 51861165102), the Research Funds for the Central Universities (Grants No. TKS20210102, TKS20210110, and TKS20210303), and the Tianjin Science and Technology Planning Project (Grant No. 17PTYPHZ00080).

  • Received Date: 2021-07-28
  • Accepted Date: 2021-11-12
  • Available Online: 2022-03-07
  • The Keulegan-Carpenter (KC) number is the main dimensionless parameter that affects the local scour of offshore wind power monopile foundations. This study conducted large-scale (1:13) physical model tests to study the local scour shape, equilibrium scour depth, and local scour volume of offshore wind power monopiles under the action of irregular waves with different KC numbers. Systematic experiments were carried out with the KC number ranging from 1.0 to 13.0. With a small KC number (KC < 6), and especially when the KC number was less than 4, the scour mainly occurred on both cross-flow sides of the monopile with a low scour depth. When the KC number exceeded 4, the shape of the scour hole changed from a fan to an ellipse, and the maximum scour depth increased significantly with KC. With a large KC number (KC > 6), the proposed method better predicted the equilibrium scour depth when the wave broke. In addition, according to the results of three-dimensional terrain scanning, the relationship between the local equilibrium scour volume of a single offshore wind power monopile and the KC number was derived. This provided a rational method for estimation of the riprap redundancy for monopile protection against scour.

     

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