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Dependence of Estimating Whitecap Coverage on Currents and swells

Journal of Ocean University of China 2021年第3期20卷 512-520页

作者： LIU Min YANG Bailin JIA Nan ZOU Zhongshui Ocean College Hebei Agriculture UniversityQinhuangdao 066000China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China PLA Information Engineering University Zhengzhou 450001China School of Marine Science Sun Yat-Sen UniversityZhuhai 519082China

The shipboard measurements of whitecap coverage(W)and the meteorological and oceanographic information from two cruises in the South China Sea and Western Pacific are explored for estimating *** study aims at evaluating how to im-prove the parameterizations of W while considering the effects of currents and swells on wave *** indeed affect W in a way that winds with following currents can decrease W,whereas winds with opposing currents can increase ***,10-m wind speed over sea surface(U_(10))is calibrated by subtracting the current velocity from U_(10) when the propagating directions of winds and currents are *** contrast,when the direction is opposite,U_(10) is calibrated by adding the parallel velocity com-ponent of the opposing current to U_(10).The power fits of W dependence on the U_(10)-related parameters of U_(10),friction velocity,wind sea Reynolds number in terms of this calibrated-U_(10) obtain better results than those directly fitted to U_(10).Different from the effect of currents on W,wind blowing along the crest line of swells may contribute to the increase in *** conclusions suggest that U_(10) should be calibrated first before parameterizing W in areas with a strong current or some swell-dominant areas.

关键词： whitecap coverage currents friction velocity wind sea Reynolds number swells

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Variations in swells along Eastern Arabian Sea during the Summer Monsoon

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Open Journal of Marine Science 2012年第2期2卷 43-50页

作者： Glejin Johnson V. Sanil Kumar Sajiv Philip Chempalayil Jai Singh Premanand Pednekar K. Ashok Kumar G. Udhaba Dora Rajamanickam Gowthaman Ocean Engineering CSIR-National Institute of Oceanography (Council of Scientific & Industrial Research) Dona Paula India

A study was carried out to find the variation in wave characteristics along the eastern Arabian Sea and the influence of swells in the nearshore waves at 3 locations during summer monsoon in 2010. Percentage of swells in the measured waves was 75% to 79% at the locations with higher percentage of swells in the northern portion of Arabian Sea com-pared to that at the southern side. The significant wave height up to 4.7 m and maximum wave height up to 7.4 m was observed. The wave height was increasing from south to north with the average significant wave height at the northern location 20% more than that at the southern location due to the increase in the swell height. Waves having spectral peak period less than 6 s were not present during the summer monsoon period. There was no change in the average value of wave statistical parameters for data collected at 1/2, 3, 6, 12 and 24 h interval.

关键词： Seas swells Wind Waves Arabian Sea Mixed Sea State Wave Spectrum

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Swell Source Analysis of East China Sea Under the Influence of Typical Typhoon Scenarios

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China Ocean Engineering 2020年第2期34卷 210-222页

作者： YAN Jin TAO Ai-feng LIN Yi-nan PEI Ye LIU Ya-yi SU Jun-wei Key Laboratory of Coastal Disaster and Defence(Hohai University) Ministry of EducationNanjing 210098China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210024China Xiamen Branch of PICC Property and Casualty Company Xiamen 361000China China Three Gorges New Energy Co Ltd.Jiangzhe CompanyYancheng 224000China

The characteristics of swells within the East China Sea have been reported by Tao et al.(2017),while the question of where the swells come from remains *** using the wave model WAVEWATCH III and the swell tracking method proposed by Hanson(2001),the spatial sources of the swells are investigated during four typical typhoon scenarios,which usually affect the wave environment in the East China Sea,including the Recurving type,the Northward type,the Westward type(striking the East China Sea)and the Westward type(over the South China Sea).The numerical results show that parts of the swells are from the North West Pacific with a long-distance *** moving paths of the swells are affected by the typhoon tracks,which result in various *** Westward type(over the South China Sea)makes one peak in the evolution *** landing process of the Westward type(striking the East China Sea)could result in swells with low *** swell energy depends on swell propagation distance,existence time and wind intensity of generation *** consistent fetch and forceful wind intensity make swell carry more energy.

关键词： swells East China Sea effect factor typhoon track

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