Local scour characteristics of monopile foundation and scour protection of cement-improved soil in marine environment - Laboratory and site investigation

OuYang, Haoran; Dai, Guoliang; Gao, Luchao; Zhu, Wenbo; Du, Shuo; Gong, Weiming

doi:10.1016/j.oceaneng.2022.111443

Cited by 26 publications

(5 citation statements)

References 34 publications

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“…As for the in-site combination measures, cement-improved soil protection was tested by Ouyang et al [68] through physical simulations under a combined action of wave and current and verified in a wind farm in Jiangsu province, China. The main components of the cement-improved soil were clay and a percentage of cement for chemical solidification.…”

Section: Ground Improvement Protectionmentioning

confidence: 99%

“…The raw materials were fully mixed as a fluid near the OWT and the mixture was pumped and flowed to the seabed surface around the monopile; then, it gradually hardened into scour protection. They concluded that the cement-improved soil approach was feasible and effective in engineering applications and provided optimal protection ranges (see [68]).…”

Section: Ground Improvement Protectionmentioning

confidence: 99%

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Scour Protection Measures for Offshore Wind Turbines: A Systematic Literature Review on Recent Developments

Wei,

Malekjafarian,

Salauddin

2024

Energies

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Offshore wind energy is considered as one of the most promising resources of clean and renewable energy to replace fossil fuels. Additionally, its cost is expected to be lower than onshore wind energy as the technology matures. Offshore wind turbines (OWTs) normally operate in harsh ocean environments, which could impact their structural integrity. Scour erosion around foundations of OWTs can substantially change the overall stiffness of these structures and shorten their lifetime. Currently, there are a limited number of studies on countermeasures and their engineering requirements for decreasing the scouring effect; this is due to their different hydraulic circumstances, such as their stability, reliability, and resistance capacity. To this end, advancements in scour protection measures in the offshore energy sector are evaluated in this paper through a thorough and critical review following the PRISMA systematic literature mapping approach. This includes 68 papers on scour protection and over 30 scour protection designs for various types of wind turbine foundations. Here, we aim to provide an overview of the latest scouring protection measures and their comprehensive assessment, as well as their prospects and future challenges. The findings of this study will provide key insights into scour protection measures for OWTs and will subsequently contribute to the future growth of the offshore renewable energy sector.

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Section: Ground Improvement Protectionmentioning

confidence: 99%

Section: Ground Improvement Protectionmentioning

confidence: 99%

Scour Protection Measures for Offshore Wind Turbines: A Systematic Literature Review on Recent Developments

Wei,

Malekjafarian,

Salauddin

2024

Energies

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“…The bed-strengthening scheme is the most common method to reduce local scour [96], mainly riprap, cement strengthening [97], bionic grass [98], etc. Riprap protection is most widely used.…”

Section: Bed-reinforced Scour Protection Schemementioning

confidence: 99%

A Review and Design Principle of Fixed-Bottom Foundation Scour Protection Schemes for Offshore Wind Energy

Gao,

Pan,

Liang

et al. 2024

JMSE

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Foundation scour is the erosion of sediments around pile foundations by wave and current in offshore wind energy. This phenomenon destabilizes foundations and poses a threat to pile safety. Therefore, scour protection becomes a crucial challenge in offshore wind projects. This paper reviews and synthesizes recent publications and patented technologies related to scour protection. Considering the primary engineering concerns, the paper proposes design principles for effective scour protection schemes to standardize evaluation criteria. These principles prioritize efficacy, independence, and cost-efficiency, enabling the analysis of scour protection scheme applicability. In addition, this paper summarizes and describes common protection schemes in the literature. The effectiveness of their protection is analyzed and summarized, and their economic and performance independence is evaluated. This paper categorizes flow-altering scour protection schemes found in the literature. Based on a comprehensive understanding of the mechanisms and engineering requirements of scour protection, the paper proposes a focus on determining the erosion reduction rate curve (Ep−U/Uc curve) as a key criterion for evaluating the effectiveness of protection schemes under varying flow velocities and the erosion reduction rate of scour protection schemes under extreme conditions. The study highlights the necessity of establishing a comprehensive design evaluation methodology, which is crucial for addressing the significant challenges related to scour encountered in offshore wind power projects.

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“…Protection measures for controlling local scour should be investigated after clarifying the mechanism of local scour around the foundation. Currently, there are two commonly used anti-scour measures; one is to use hard marine engineering materials to make physical anti-scour plates, and another is to change the flow field around the subsea structures to make the scour area away from the foundations [95]. Studies have shown that the anti-sinking plate support structure with a skirt can effectively alleviate the local erosion effect [97].…”

Section: Underwater Gas Storagementioning

confidence: 99%

“…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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Local scour characteristics of monopile foundation and scour protection of cement-improved soil in marine environment - Laboratory and site investigation

Cited by 26 publications

References 34 publications

Scour Protection Measures for Offshore Wind Turbines: A Systematic Literature Review on Recent Developments

Scour Protection Measures for Offshore Wind Turbines: A Systematic Literature Review on Recent Developments

A Review and Design Principle of Fixed-Bottom Foundation Scour Protection Schemes for Offshore Wind Energy

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

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