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波致应力的近似求解及其太平洋特征分析
王倩1, 宋金宝1, 曹海锦2, 乔文丽1
1.浙江大学海洋学院 舟山 316021;2.河海大学海洋学院 南京 210098
摘要:
基于波致应力计算中对海浪谱和波浪增长率公式的敏感性分析,选择适当的波致应力近似求解方法,计算和探讨了太平洋波致应力的时空分布特征。敏感性分析中,选择了4种常用的波浪增长率公式和3种经验解析海浪谱。推导了计算波致应力的单波公式,并将其与JONSWAP谱积分公式和Elfouhaily谱积分公式进行比较,同时使用了由风速和有效波高资料构造的Elfouhaily谱积分公式计算太平洋波致应力。结果表明:Belcher等(1993)的波浪增长率计算公式估算的波致应力与实验数据吻合度较好,同时适用ERA-interim数据;当波龄小于1.2时运用Elfouhaily谱积分公式更合适,当波龄大于1.2时运用单波公式更快速有效;太平洋的波致应力分布与风场之间存在明显的相关性;2009年1月、4月、7月和10月太平洋波致应力的季节性特征分析表明四个季节的西风带波致应力较其他地区都更强盛,而在时间变化上1月和10月为波致应力整体较为强盛的时期。
关键词:  波致应力  单波公式  波浪增长率  海浪谱  太平洋
DOI:10.11693/hyhz20170900242
分类号:P731
基金项目:国家自然科学基金项目,41576013号。
APPROXIMATE ESTIMATION OF WAVE-INDUCED STRESS AND ITS CHARACTERISTIC ANALYSIS IN THE PACIFIC
WANG Qian1, SONG Jin-Bao1, CAO Hai-Jin2, QIAO Wen-Li1
1.Institute of Physical Oceanography, Ocean College, Zhejiang University, Zhoushan 316021, China;2.College of Oceanography, Hohai University, Nanjing 210098, China
Abstract:
By conducting a sensitivity analysis of wave-induced stress on wave spectrum with wave-growth-rate formulas, an estimation method of wave-induced stress is developed for describing the spatial and seasonal characteristics of wave-induced stress across the Pacific Ocean. Four frequently used wave-growth-rate formulas and three empirical analytic wave spectra are selected in the sensitivity analysis. A monochromatic wave approximation of wave induced stress was proposed and compared with both JONSWAP spectral integral formula and Elfouhaily spectral integral formula. The Elfouhaily spectral integral formula that constructed with wind speed and effective wave height was used to calculate wave-induced stress in the Pacific. The result shows that the Belcher-and-Hunt formula agrees best with available experimental data and suits for ERA-Interim data. The Elfouhaily formula is better when wave age is <1.2. However, if wave age is >1.2, monochromatic wave approximation is suitable and fast. The correlation between the distribution of the wave-induced stress and the wind field in the Pacific is obvious. Characteristics of wave-induced stress in January, April, July, and October of 2009 in the Pacific indicate that the wave-induced stress in the westerly zone was stronger than other areas in all four seasons, and was more powerful in January and October.
Key words:  wave-induced stress  monochromatic wave formula  wave growth rate  wave spectrum  the Pacific Ocean
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