文献类型：期刊文献

中文题名：风暴作用下浅水波浪的MEEMD分析

英文题名：MEEMD Analysis of the Shallow Water Waves During a Storm

作者：胡泰桓[1];曾春华[2];朱道恒[1];李志强[1]

机构：[1]广东海洋大学电子与信息工程学院,广东湛江524088;[2]广东海洋大学海洋工程学院,广东湛江524000

年份：2023

卷号：41

期号：1

起止页码：76

中文期刊名：海洋科学进展

外文期刊名：Advances in Marine Science

收录：CSTPCD、、CSCD2023_2024、北大核心、CSCD、北大核心2020

基金：国家自然科学基金项目(41676079);广东海洋大学创新强校工程项目(Q18307)。

语种：中文

中文关键词：风暴;青安湾;MEEMD;能量;自由海面;波浪谱

外文关键词：storm;Qing’an Bay;MEEMD;energy;free sea surface;wave spectrum

中文摘要：利用MEEMD(Median Ensemble Empirical Mode Decomposition)对2018年16号热带风暴期间琼州海峡青安湾破波带波面数据进行分析,得到了波面的内在模态函数(Intrinsic Mode Function,IMF)以及对总方差的贡献,并比较了收集到的原始数据和相应的希尔伯特边际谱。结果发现:①风暴能量增强阶段,波浪结构中各成分波的波能均得到了较大增强,对波浪能量的贡献主要集中在高频、低频两侧波段;但风暴减弱阶段,波浪结构中波能分布表现为高频高能、低频低能的特征。②风暴能量减弱,破波带长重力波频带能量迅速衰减。③相对风暴距离不同、相对风暴方位不同,其波浪结构各成分波频幅不同,具体表现为:研究区域相对风暴前进路径方位不同,距风暴中心距离不同时,距离更远的低频模态频率更大,低频模态能量更小;距风暴中心距离相同,相对风暴前进路径方位不同时,向岸风状态的波浪较高模态波能量更大;相对风暴前进路径方位相同,距离不同时,模态频率变化表现为距离更近的各模态频率更低、波浪能量更大。

外文摘要：The MEEMD(median ensemble empirical mode decomposition)is used to analyze the nearshore wave surface data of the Qingan Bay in the Qiongzhou Strait during the 16th tropical storm in 2018,and different intrinsic mode functions(IMF)and their contributions to the total variance are obtained,then the collected raw data are compared with corresponding Hilbert marginal spectrum.The results show that,in the growth stage of the storm,the wave energy of each component wave in the wave group structure is greatly enhanced,and the contribution to the wave group energy is mainly in the high and low frequency bands.But in the storm weakening stage,the wave energy distribution in the wave group structure exhibits the characteristics of high frequency with high energy and low frequency with low energy.As the energy of the storm decreases,the energy of the long gravitational wave band in broken wave zone is rapidly attenuated.The results also show that,different distances and azimuths relative to the storm result in different wave frequency and amplitude of each component of the wave structure.The specific manifestations are as follows:As the study area has different azimuths relative to the advancing path of the storm,and different distances from the storm center,the fartheraway low-frequency modal has larger frequencies,and the low frequency modal's energy is smaller;As the distance away from the storm center is the same but the orientation relative to the advancing path of the storm is different,the energy of higher mode component of the waves forced by onshore winds is larger;As the relative azimuth of the advancing path of the storm is same but the distance is different,the modal frequency change exhibits the feature that the frequency of components with closer distance is lower,and the wave energy of all the modal components is larger.