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Cite this paper: |
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Xingjie JIANG, Tingting ZHANG, Dalu GAO, Daolong WANG, Yongzeng YANG. Estimating the evolution of sea state non-Gaussianity based on a phase-resolving model[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1909-1923 |
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Estimating the evolution of sea state non-Gaussianity based on a phase-resolving model |
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Xingjie JIANG1,2,3, Tingting ZHANG1,2,3,4, Dalu GAO1,2,3, Daolong WANG1,2,3,4, Yongzeng YANG1,2,3 |
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1 First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China; 2 Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China; 3 Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao 266061, China; 4 Ocean University of China, College of Oceanic and Atmospheric Sciences, Qingdao 266071, China |
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Abstract: |
The occurrence of rogue waves is closely related to the non-Gaussianity of sea states, and this non-Gaussianity can be estimated using corresponding two-dimensional wave spectra. This paper presents an approach to non-Gaussianity estimation based on a phase-resolving model called the high-order spectral method (HOSM). Based on numerous HOSM simulations, a set of precalculated non-Gaussianity indicators was established that could be applied to real sea states without any calibration of spectral shapes. With a newly developed extraction approach, the indicators for given two-dimensional wave spectra could then be conveniently extracted from the precalculated dataset. The feasibility of the newly developed approach in a real wave environment is verified. Using the estimation approach, phase-resolved non-Gaussianity can now be illustrated throughout the evolution of sea states of interest, not just at a few specific times; and the level of non-Gaussianity at any time in a duration can be identified according to the statistics (e.g., quantities) of the phase-resolved indicators, that are obtained throughout the duration concerned. |
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Key words:
rogue wave
sea state non-Gaussianity
high-order spectral method
spectral geometry
wavewave nonlinearity
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Received: 2021-07-20 Revised: 2021-09-26 |
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