RESEARCH ON CALCULATION METHOD FOR LOCAL SCOUR RANGE AND VOLUME AROUND PILE FOUNDATIONS UNDER COMBINED ACTION OF WAVES AND CURRENT

Pan Xiaochun; Gu Xiaoqing; Ren Zhijun; Shu Jiaqing; Wang Xiaohui

doi:10.19912/j.0254-0096.tynxb.2024-1987

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (3) : 367-374. DOI: 10.19912/j.0254-0096.tynxb.2024-1987

RESEARCH ON CALCULATION METHOD FOR LOCAL SCOUR RANGE AND VOLUME AROUND PILE FOUNDATIONS UNDER COMBINED ACTION OF WAVES AND CURRENT

Pan Xiaochun, Gu Xiaoqing, Ren Zhijun, Shu Jiaqing, Wang Xiaohui

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Abstract

In order to reasonably determine the scour protection measures and engineering quantities, it is necessary to accurately estimate the local scour range and volume of the pile foundations. Based on the analysis of concepts such as internal friction angle of sediment particles, underwater angle of repose, and slope angle of scour pits, this article uses effective data from 240 sets of unprotected pile foundation scour monitoring at an offshore wind farm in Yancheng, Jiangsu and 96 sets at an offshore wind farm in Zhanjiang, Guangdong. Local scour pits are generalized as annular circular cones, and the empirical relationship between local scour pit slope angle and scour depth is statistically analyzed. A new method for calculating the local scour volume and range of pile foundations under the combined action of waves and current is proposed. The verification using the reserved 60 sets of scour monitoring data showed that the local scour range and volume of the pile foundation calculated according to the formula based on internal friction angle in the current specifications were significantly smaller, while the scour volume calculated by the method in this paper was quite close to the measured volume as a whole. The local scour pit of the pile foundation is located below the bed surface, and the sediment particles on the slope do not need to be in a critical incipient-motion. The slope angle is smaller than the underwater angle of repose and internal friction angle. The calculation formula for local scour range in current standards should be revised accordingly. This method provides a basis for adopting targeted scour protection measures and developing reliable scour protection devices. However, in the future, it is still necessary to continue accumulating local scour monitoring data of offshore pile foundations to continuously improve the calculation accuracy of scour volume and range.

Key words

offshore wind farms / pile foundations / wave and current / local scour / angle of internal friction / subaqueous angle of repose

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Pan Xiaochun, Gu Xiaoqing, Ren Zhijun, Shu Jiaqing, Wang Xiaohui. RESEARCH ON CALCULATION METHOD FOR LOCAL SCOUR RANGE AND VOLUME AROUND PILE FOUNDATIONS UNDER COMBINED ACTION OF WAVES AND CURRENT[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 367-374 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1987

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