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白浪覆盖率模式中参量的研究
于定勇1, 刘华兴1, 李 晶2, 李翠琳1, 徐德伦3
1.中国海洋大学工程学院;2.DHI-NTU Water & Environment Research Center, School of Civil and Environmental Engineering, Nanyang Technological University;3.中国海洋大学海洋环境学院
摘要:
在波面位移为正态过程的假定下, 推导出一种以平均周期和风速为参量的白浪覆盖率公式W = 1? Φ{5.11904(T/U10)}0.7576。依据摩擦风速和U10 的表达式, 进一步推导出白浪覆盖率依赖于摩擦风速的形式W = 1? Φ{0.5227(T/U*)}0.7576。考虑到在实际应用中, 经常需要用波龄描述波浪的状态,将白浪覆盖率表示成一种形式简单的波龄的函数W =1?Φ(3.6496ξ0.7576), 与Monahan 等的海上测量数据符合良好。
关键词:  白浪覆盖率, 风浪破碎概率, 摩擦风速, 波龄
DOI：10.11693/hyhz200901002002
分类号:
基金项目:国家自然科学基金项目, 50479028 号; 国家自然科学重大基金项目, 40490263 号
THE PARAMETERS IN WHITECAP COVERAGE MODEL
YU Ding-Yong1, LIU Hua-Xing1, LI Jing2, LI Cui-Lin1, XU De-Lun3
1.College of Engineering, Ocean University of China;2.DHI-NTU Water & Environment Research Center, School of Civil and Environmental Engineering, Nanyang Technological University;3.College of Physical Oceanography, Ocean University of China
Abstract:
A simple formula is analytically derived based on a Gaussian wave field, which is used to estimate the spatial fraction of breaking sea surface at an instant time, i.e., whitecap coverage W. The resulting whitecap coverage is related to wind speed and wave average period. According to the relation between friction speed U* and U10, this derived formula is further expressed with U*. As a wave age is often used to describe the wave state in practice, whitecap coverage is expressed as a simple function of the age. The results of the new model and regarding field data agreed well.
Key words:  Whitecap coverage, Wave breaking probability, Friction speed, Wave age
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