Local scour at offshore windfarm monopile foundations: A review

Guan, Dawei; Xie, Yu-xuan; Yao, Zishun; Chiew, Yee‐Meng; Zhang, Jisheng; Zheng, Jinhai

doi:10.1016/j.wse.2021.12.006

Cited by 44 publications

(16 citation statements)

References 76 publications

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“…This aspect has been reported in past studies by Qi & Gao [21,22], that as the velocity around the circular monopile increases, while keeping the other parameters constant, there is a corresponding increase in the Froude number [43]. This increase in the flow velocity generates greater turbulence in the vicinity of circular monopile, leading to the formation of additional eddy currents and streamlines [44][45][46][47]. Consequently, this augmented turbulence and increased streamlines result in a faster movement of bed particles, ultimately leading to a deeper scour hole formation nearer to the circular monopiles [9,48].…”

Section: Variables For Prediction Of Scour Depth Using Machine-learni...supporting

confidence: 64%

Physics-based and machine-learning models for accurate scour depth prediction

Jatoliya,

Bhattacharya,

Manna

et al. 2023

Phil. Trans. R. Soc. A.

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Scour phenomena remain a significant cause of instability in offshore structures. The present study estimates scour depths using physics-based numerical modelling and machine-learning (ML) algorithms. For the ML prediction, datasets were collected from previous studies, and the trained models checked against the statistical measures and reported outcomes. The numerical assessment of the scour depth has been also carried out for the current and coupled wave–current environment within a computational fluid dynamics framework with the aid of the open-source platform REEF3D. The outcomes are validated against the previously reported experimental studies. The results obtained from ML schemes demonstrated that the artificial neural network and adaptive neuro-fuzzy interface system models have an elevated level of effectiveness compared with the other models. Whereas the numerical analysis results show a good agreement against the reported values. For the current only conditions, the normalized scour depth ( S / D ) at the front and rear end of the pier is 0.65 and 0.81. For the wave–current conditions, the normalized scour depth ( S / D ) is 0.26. The study highlights the importance of machine learning and physics-based numerical modelling to assess scour depth within a reasonable time frame without compromising accuracy. This article is part of the theme issue 'Physics-informed machine learning and its structural integrity applications (Part 2)'.

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Section: Variables For Prediction Of Scour Depth Using Machine-learni...supporting

confidence: 64%

Physics-based and machine-learning models for accurate scour depth prediction

Jatoliya,

Bhattacharya,

Manna

et al. 2023

Phil. Trans. R. Soc. A.

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“…However, the operating environment of the underwater energy storage accumulators is Separation vortices generated by the ocean current around the gas storage accumulator will erode the soil near the foundation, thereby affecting its stability. Therefore, it is important to understand the local scouring characteristics and predict the scouring depth around the foundation [95,96]. Protection measures for controlling local scour should be investigated after clarifying the mechanism of local scour around the foundation.…”

Section: Underwater Gas Storagementioning

confidence: 99%

Underwater Compressed Gas Energy Storage (UWCGES): Current Status, Challenges, and Future Perspectives

Wang

Liang

et al. 2022

Applied Sciences

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Underwater compressed air energy storage was developed from its terrestrial counterpart. It has also evolved to underwater compressed natural gas and hydrogen energy storage in recent years. UWCGES is a promising energy storage technology for the marine environment and subsequently of recent significant interest attention. However, it is still immature. In this study, the latest progress in both academic and industrial fields is summarized. Additionally, challenges facing this emerging technology are analyzed. The pros and cons of UWCGES are provided and are differentiated from the terrestrial variant. Technical, economic, environmental, and policy challenges are examined. In particular, the critical issues for developing artificial large and ultra-large underwater gas storage accumulators and effective underwater gas transportation are comprehensively analyzed. Finally, the demand for marine energy storage technology is briefly summarized, and the potential application scenarios and application modes of underwater compressed gas energy storage technology are prospected. This study aims to highlight the current state of the UWCGES sector and provide some guidance and reference for theoretical research and industrial development.

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“…The findings from these tests reveal that, when subjected to low KC numbers, the actual damage inflicted on the scour protection layer is notably less severe than what the KC numbers had initially predicted. In addition, the research reported in [11] unveils an additional phenomenon, i.e., waves also have a substantial influence on the soil pore water pressure, causing cyclical fluctuations in the soil pore water pressure and even triggering seabed liquefaction in extreme cases. This phenomenon clarifies why sediments atop the seabed surface are more susceptible to erosion under the combined influence of tidal currents and waves, thereby imposing a substantial threat to OWTs.…”

Section: Introductionmentioning

confidence: 95%

A Study on the Scour Surrounding the Fixed Foundation of an Offshore Wind Turbine under Complex Waves, Tidal Currents, and Pile Vibration Conditions

Qin,

Qu,

Yang

et al. 2024

Energies

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Scouring around the fixed foundations of offshore wind turbines (OWTs) remains a pressing concern within the offshore wind industry, significantly jeopardizing OWT safety. Despite previous efforts, the current understanding of this phenomenon remains incomplete, as various factors related to offshore wind farms and OWT operations can exert intricate influences. To further explore this matter, this paper undertakes a new study to further understand the interplay between monopile vibrations, tidal currents, and sea waves, elucidating their combined impact on scour surrounding an OWT’s foundation. It was found that, besides pile vibration amplitude and frequency, the pile vibration direction can also notably influence the scour around the monopile. Specifically, the most pronounced scour mostly transpires when the monopile undergoes vibrations along the 135° direction relative to the inflow direction. The mildest scour mostly occurs when the pile vibrates along the 90° direction. Additionally, this study reveals that different types of waves, indicated by the ratio of water depth, H, to wavelength, L, also engender varying scour around the monopile. The influence of waves on scour increases with the decrease in the H/L ratio, implying that OWT foundations are more threatened by shallow water waves than by deep water waves.

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Local scour at offshore windfarm monopile foundations: A review

Cited by 44 publications

References 76 publications

Physics-based and machine-learning models for accurate scour depth prediction

Physics-based and machine-learning models for accurate scour depth prediction

Underwater Compressed Gas Energy Storage (UWCGES): Current Status, Challenges, and Future Perspectives

A Study on the Scour Surrounding the Fixed Foundation of an Offshore Wind Turbine under Complex Waves, Tidal Currents, and Pile Vibration Conditions

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