Unsteady Ekman-Stokes Dynamics: Implications for Surface Wave-Induced Drift of Floating Marine Litter

被引：15

作者：

Higgins, C. ^{[1
,2
,3
]}

Vanneste, J. ^{[2
,3
]}

van den Bremer, T. S. ^{[1
]}

机构：

[1] Univ Oxford, Dept Engn Sci, Oxford, England

[2] Univ Edinburgh, Sch Math, Edinburgh, Midlothian, Scotland

[3] Univ Edinburgh, Maxwell Inst Math Sci, Edinburgh, Midlothian, Scotland

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 18期

基金：

英国自然环境研究理事会;

关键词：

surface gravity waves; waves and mean flows; wave-induced transport; marine transport models; DRIVEN; CURRENTS; DEBRIS; MODEL; MICROPLASTICS; WATER; FATE;

D O I：

10.1029/2020GL089189

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页数：10

共 51 条

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