Ekman Currents and Mixing due to Surface Gravity Waves
Ekman Currents and Mixing due to Surface Gravity Waves
复制标题
表面重力波引起的埃克曼电流和混合
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
J. Weber
中科院分区：
文献类型：
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作者：
J. Weber
本文从理论上研究了定常Ekman边界层流的情况，即涡动粘性正比于湍流波中波轨道速度的切变，乘以混合长度的平方（Kitaigorodsky，1961）。假设一个充分发展的海洋，波浪的特性，因此涡动粘性随深度的分布，是由风。动量方程数值求解产生的Ekman电流作为风速的函数。结果表明，在10 m高度处，Ekman表面流的大小在风速的2.1%~ 3%之间。偏离风向的偏转角是风速的单调递减函数。当风速在5 m s − 1至30 m s−1之间时，它的变化范围为36 °至25°。
Abstract The steady Ekman boundary-layer current is studied theoretically for the case when the eddy viscosity is proportional to the shear of the wave orbital velocity in a turbulent wave, times the square of a mixing length (Kitaigorodsky, 1961). Assuming a fully developed sea, the wave characteristics, and hence the eddy viscosity distribution with depth, are determined by the wind. The momentum equation is solved numerically to yield the Ekman current as a function of the wind speed. The results show that the magnitude of the Ekman surface current lies between 2.1 and 3% of the wind speed at 10 m height. The deflection angle away from the wind direction is a monotonic decreasing function of wind speed. It varies from 36 to 25° for winds between 5 and 30 m s−1.