Volume 18 Issue 3
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Article Navigation >  Water Science and Engineering  > 2025  >  18(3): 369-377
En-yu Gong, Song-gui Chen, Xin Chen, Da-wei Guan, Jin-hai Zheng. 2025: Large-scale experimental study on scour around both slender and large monopiles under irregular waves. Water Science and Engineering, 18(3): 369-377. doi: 10.1016/j.wse.2025.05.001
Citation: En-yu Gong, Song-gui Chen, Xin Chen, Da-wei Guan, Jin-hai Zheng. 2025: Large-scale experimental study on scour around both slender and large monopiles under irregular waves. Water Science and Engineering, 18(3): 369-377. doi: 10.1016/j.wse.2025.05.001
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Large-scale experimental study on scour around both slender and large monopiles under irregular waves

doi: 10.1016/j.wse.2025.05.001

  • a. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;

  • b. Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China;

  • c. Key Laboratory of Ministry of Education for Coastal Disaster and Protection, Hohai University, Nanjing 210098, China

Funds:

This work was supported by the National Nature Science Foundation of China National Outstanding Youth Science Fund Project (Grant No. 52122109) and the National Natural Science Foundation of China (Grants No. 51861165102 and 52039005).

  • Received Date: 2024-12-12
  • Accepted Date: 2025-03-12
    • Available Online: 2025-10-15
    Abstract
  • Offshore wind power plays a crucial role in energy strategies. The results of traditional small-scale physical models may be unreliable when extrapolated to large field scales. This study addressed this limitation by conducting large-scale (1:13) experiments to investigate the scour hole pattern and equilibrium scour depth around both slender and large monopiles under irregular waves. The experiments adopted Keulegan—Carpenter number (NKC) values from 1.01 to 8.89 and diffraction parameter (D/L, where D is the diameter of the monopile, and L is the wave length) values from 0.016 to 0.056. The results showed that changes in the maximum scour location and scour hole shape around a slender monopile were associated with NKC, with differences observed between irregular and regular waves. Improving the calculation of NKC enhanced the accuracy of existing scour formulae under irregular waves. The maximum scour locations around a large monopile were consistently found on both sides, regardless of NKC and D/L, but the scour hole topography was influenced by both parameters. Notably, the scour range around a large monopile was at least as large as the monopile diameter.

     

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