Researches on characteristics of shapes of freak waves in the Norwegian Sea

Fu Ruili; Cai Huayi; Tao Aifeng; Zheng Jinhai; Wang Gang

doi:10.12284/hyxb2023031

Volume 45 Issue 4

Mar. 2023

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Fu Ruili，Cai Huayi，Tao Aifeng, et al. Researches on characteristics of shapes of freak waves in the Norwegian Sea[J]. Haiyang Xuebao，2023, 45(4)：133–143 doi: 10.12284/hyxb2023031

Citation:

Fu Ruili，Cai Huayi，Tao Aifeng, et al. Researches on characteristics of shapes of freak waves in the Norwegian Sea[J]. Haiyang Xuebao，2023, 45(4)：133–143 doi: 10.12284/hyxb2023031

Citation:

Fu Ruili，Cai Huayi，Tao Aifeng, et al. Researches on characteristics of shapes of freak waves in the Norwegian Sea[J]. Haiyang Xuebao，2023, 45(4)：133–143 doi: 10.12284/hyxb2023031

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Researches on characteristics of shapes of freak waves in the Norwegian Sea

doi: 10.12284/hyxb2023031

1.
Key Laboratory of Ministry of Education for Coastal Disaster and Protection, Hohai University, Nanjing 210098, China
2.
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China

Received Date: 2022-08-04
Rev Recd Date: 2022-10-10

Available Online: 2023-02-16

Publish Date: 2023-03-31

Abstract

Abstract

Shapes of freak waves are strongly related to the characteristics of their surrounding sea state. The most probable shape of rogue waves obeys NewWave theory under the narrow band assumption in the linear process. Based on the NewWave theory, the largest wave is located in the center of a wave group and the adjacent waves are symmetrical. However, wide spectral widths containing various frequency components are more common in the ocean. There is still a lack of systematic understanding of the shapes of in-situ measured freak waves and the surrounding waves. Furthermore, key parameters that affect the shapes are not clear. In the present study, shapes of 112 freak waves and the related influence factors from the ocean weather station in the Norwegian Sea are investigated. Merely 52% of freak waves are located in the center of the group, and the possibility of other freak waves occurring towards the front of the wave groups is higher. Besides, shapes of the adjacent prior and following waves of freak waves are asymmetry. Generally, the amplitude of the following wave is larger than that of the preceding one. By quantitatively comparing shapes of the averaged measured rogue waves and based on the NewWave theory, it is found that the spectral width is a key parameter for affecting shapes of freak waves. With the spectral width wider, the difference of profiles of sea surface elevations around the freak waves between the measured and using the NewWave theory is exponentially increasing.
- freak waves,
- Norwegian Sea,
- wave shapes,
- asymmetry,
- spectral widths

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References(26)

References

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