Cite this paper:
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

Estimating the evolution of sea state non-Gaussianity based on a phase-resolving model

Xingjie JIANG1,2,3, Tingting ZHANG1,2,3,4, Dalu GAO1,2,3, Daolong WANG1,2,3,4, Yongzeng YANG1,2,3
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
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.
Key words:    rogue wave    sea state non-Gaussianity    high-order spectral method    spectral geometry    wavewave nonlinearity   
Received: 2021-07-20   Revised: 2021-09-26
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