Summary for “Liquefaction stabilization of the seabed around a sloping breakwater under bimodal spectral waves”

Sui Titi; Jiang Qihe; Wang Guangsheng; Yang Musheng; Sun Chaoyang; Zhang Chi; Zheng JinHai

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Sui Titi，Jiang Qihe，Wang Guangsheng, et al. Summary for “Liquefaction stabilization of the seabed around a sloping breakwater under bimodal spectral waves”[J]. Haiyang Xuebao，2025, 47(x)：1–10

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Summary for “Liquefaction stabilization of the seabed around a sloping breakwater under bimodal spectral waves”

1.
Key Laboratory of Coastal Disaster and Protection (Hohai University), Ministry of Education, Nanjing, Jiangsu, China, 210024
2.
China Harbour Engineering Company Ltd., Beijing, China, 100027
3.
Shanghai Maritime Surveying and Mapping Center of Eastern Navigation Service Center, Maritime Safety Administration, Shanghai, China, 200003

Received Date: 2024-12-12
Rev Recd Date: 2025-02-14

Available Online: 2025-03-14

Abstract

Abstract

This article explores the distinctive marine environment of the West African coastal region, with a particular focus on bimodal waves-induced seabed response and stability around sloping breakwaters. Bimodal waves are a unique wave pattern observed in the West African Sea, influenced by distant swells from the North Atlantic. These waves present new challenges in marine engineering, particularly in the design and maintenance of breakwater structures. A complex numerical model has been developed to simulate the interaction between bimodal spectrum random waves and sloping breakwaters. This model is grounded in the Reynolds-averaged Navier-Stokes equations and employs the k-ω turbulence model to simulate the flow field and pressure distribution around the breakwater. Furthermore, the model incorporates Biot’s semi-dynamic porous medium theory (the u-p model) to assess wave-induced pore pressure and the liquefaction features of the seabed. The study found that the pore pressure response varies under different conditions, generally indicating that pore pressure increases with the swell energy ratio (SER). It was observed that low-frequency pore pressure becomes more pronounced with increasing depth and swell wave ratio. Analyzing the swell energy ratio revealed that the attenuation rate of low-frequency energy is lower than that of high-frequency energy. As the swell energy ratio increases, the pore pressure response in the seabed intensifies significantly, leading to an expansion in the range and depth of seabed liquefaction, especially noticeable at certain distances in front of the breakwater. Furthermore, the influence of high-frequency and low-frequency pore pressure on seabed liquefaction alternates with the increasing distance from the breakwater’s toe. This study provides a scientific basis for the design and stability assessment of sloping breakwaters.
- bimodal waves,
- sloping breakwater,
- seabed liquefaction,
- numerical simulation

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References(26)

References

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