Unsteady Ekman--Stokes dynamics: implications for surface-wave induced drift of floating marine litter
Unsteady Ekman--Stokes dynamics: implications for surface-wave induced drift of floating marine litter
复制标题
不稳定的埃克曼--斯托克斯动力学：对漂浮海洋垃圾表面波诱导漂移的影响
DOI：
10.1002/essoar.10503364.1
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Higgins C
中科院分区：
文献类型：
--
作者：
Higgins C
我们研究斯托克斯漂移和波浪引起的运输漂浮海洋垃圾的表面上的旋转海洋湍流混合层。由于科里奥利-斯托克斯强迫和表面波应力，形成二阶欧拉平均流，必须将其添加到斯托克斯漂移中以获得正确的波浪诱导拉格朗日速度。我们表明，这种波驱动的欧拉平均流可以表示为非定常斯托克斯漂移和“埃克曼-斯托克斯核”之间的卷积。使用这个卷积，我们计算了不稳定波驱动对粒子输运的贡献。我们报告的显着差异，在两个方向和幅度的运输时，欧拉平均埃克曼-斯托克斯速度。
We examine Stokes drift and wave‐induced transport of floating marine litter on the surface of a rotating ocean with a turbulent mixed layer. Due to Coriolis‐Stokes forcing and surface wave stress, a second‐order Eulerian‐mean flow forms, which must be added to the Stokes drift to obtain the correct wave‐induced Lagrangian velocity. We show that this wave‐driven Eulerian‐mean flow can be expressed as a convolution between the unsteady Stokes drift and an “Ekman‐Stokes kernel.” Using this convolution, we calculate the unsteady wave‐driven contribution to particle transport. We report significant differences in both direction and magnitude of transport when the Eulerian‐mean Ekman‐Stokes velocity is included.