STUDY ON LOCAL SCOUR CHARACTERISTICS OF SEABED AROUND OFFSHORE WIND POWER PILES

Huan Caiyun; Jiang Zhenqiang; Qiao Hou; Chen Lulu

doi:10.19912/j.0254-0096.tynxb.2024-2417

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 584-592. DOI: 10.19912/j.0254-0096.tynxb.2024-2417

STUDY ON LOCAL SCOUR CHARACTERISTICS OF SEABED AROUND OFFSHORE WIND POWER PILES

Huan Caiyun¹, Jiang Zhenqiang¹, Qiao Hou¹, Chen Lulu²

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Abstract

Taking an offshore wind farm in Dafeng, Jiangsu Province as an example, based on the measured underwater terrain data of representative turbine positions, this study analyzes the local erosion characteristics of the pile foundation and the evolution process of the erosion pit, and explores the mechanism of the erosion pit evolution process. The results show that： 1） There is a funnel-shaped scour hole developed on the seabed near the pile foundation, and the planar shape of the scour hole is elliptical. The long axis of the ellipse follows the mainstream direction of the rising and falling currents. The length of the scour hole is linearly correlated with the maximum scour depth of the scour hole. The maximum scour depth of the scour hole occurs on the side of the pile foundation facing the falling current, with a maximum depth of 7-8 meters for the 25# machine position and 5-6 meters for the 55# machine position. 2） During the period from December 2021 to September 2022, the scouring pit underwent a process of first scouring and then siltation, and overall scouring and siltation adjustment. The scouring is mainly distributed on the periphery of the scouring pit, and the siltation is mainly distributed near the pile foundation inside the scouring pit. In September 2022, the impact of Typhoon Muifa caused a certain degree of siltation in the scouring pit. 3） Given the large size and depth of the scour hole, it is recommended to expand underwater terrain monitoring to all machine positions in the site area and take timely anti scour measures to prevent further development of the scour hole.

Key words

offshore wind power / single pile foundation / local scour / underwater topographic survey / scour pit development / scouring length / scouring width

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Huan Caiyun, Jiang Zhenqiang, Qiao Hou, Chen Lulu. STUDY ON LOCAL SCOUR CHARACTERISTICS OF SEABED AROUND OFFSHORE WIND POWER PILES[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 584-592 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2417

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