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

作　　者：Xingjie JIANG Tingting ZHANG Dalu GAO Daolong WANG Yongzeng YANG 

机构地区：[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

出　　处：《Journal of Oceanology and Limnology》2022年第5期1909-1923,共15页海洋湖沼学报（英文）

基　　金：Supported by the National Key Research and Development Program of China(Nos.2016YFC1402004,2016YFC1401805,2017YFC1404201)。

摘　　要：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.

关 键 词：rogue wave sea state non-Gaussianity high-order spectral method spectral geometry wave-wave nonlinearity 

分 类 号：P731.22[天文地球—海洋科学]