Submesoscale current effects on surface waves
Submesoscale current effects on surface waves
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DOI：
10.1016/j.ocemod.2020.101662
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发表时间：
2020-09
期刊：
影响因子：
3.2
通讯作者：
Leonel Romero;D. Hypolite;J. McWilliams
中科院分区：
文献类型：
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作者：
Leonel Romero;D. Hypolite;J. McWilliams
我们提出了一个数值研究的当前影响波（CEW）在亚中尺度（100的m-10的公里）与一个现实的模式配置在南加州。CEW是通过比较风强迫的解决方案进行分析，并通过相对差异，没有电流强迫。波场的调制，由于电流是较大的破波变量（即，白浪覆盖，空气夹带，能量耗散），其次是解决均方斜率，表面斯托克斯漂移，和显着的波高。背景流平均使定向传播增加0.9°，对平均波向的调制在±5°以内。CEW随着风速的增加而减小，因为均方根电流梯度也减小，而风强迫和破碎使波场在更高的风速下更快地恢复平衡。经验缩放的基础上的平均波周期，均方根电流梯度，和摩擦速度被发现解释80%或更多的模型差异，由于CEW的变化，除了显着的波高，解释66%的变异。由于CEW的模型差异的统计近似高斯的显着波高，对称的有限过剩峰度的较高的谱矩，和正偏斜的过剩峰度的破波变量。
We present a numerical study of current effects on waves (CEW) at submesoscales (100’s of m–10’s of km) with a realistic model configuration in Southern California. CEW is analyzed by comparing solutions forced by winds with and without current forcing through relative differences. The modulation of wave field due to currents is larger for the wave-breaking variables (ie, whitecap coverage, air-entrainment, and energy dissipation) followed by the resolved mean square slope, surface Stokes drift, and the significant wave height. Background currents on average increase the directional spreading by 0.9° and modulate the mean wave direction within±5°. CEW decreases with increasing wind speed because the rms current gradients also decrease while the wind forcing and breaking restore the wave field towards equilibrium faster at higher winds. Empirical scalings based on the mean wave period, rms current gradients, and friction velocity are found to explain 80% or more of the variability for the model differences due to CEW except for the significant wave height, explaining 66% of the variability. The statistics of model differences due to CEW are approximately Gaussian for the significant wave height, symmetric with finite excess kurtosis for the higher spectral moments, and positively skewed with excess kurtosis for the wave-breaking variables.