Surface wave-induced Eulerian-mean flows in the open ocean
<p>This thesis examines Lagrangian-mean flows induced by surface gravity waves, with particular emphasis on the displacements associated with these flows. Stokes drift, the small Lagrangian-mean velocity accompanying the orbital motion of particles beneath surface waves, has been well-studied,...
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| Інші автори: | |
| Формат: | Дисертація |
| Мова: | English |
| Опубліковано: |
2020
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| Предмети: |
| _version_ | 1826316404993818624 |
|---|---|
| author | Higgins, CJ |
| author2 | van den Bremer, T |
| author_facet | van den Bremer, T Higgins, CJ |
| author_sort | Higgins, CJ |
| collection | OXFORD |
| description | <p>This thesis examines Lagrangian-mean flows induced by surface gravity waves, with
particular emphasis on the displacements associated with these flows. Stokes drift,
the small Lagrangian-mean velocity accompanying the orbital motion of particles
beneath surface waves, has been well-studied, and is proven to play a role in ocean
transport. However, Eulerian-mean flows induced by slow variation of the wave
field (divergence-driven), viscous effects, or geophysical effects such as density
stratification and planetary rotation, have received less attention. It is the aim
of this thesis to study these wave-induced Eulerian-mean flows, which must be
superimposed on the Stokes drift to obtain the correct Lagrangian-mean (or mass
transport) velocity induced by surface gravity waves. In Chapter 2, the effects of
wave directional spread and density stratification on the mean flow induced by
a surface gravity wavepacket in deep water are studied, and the corresponding
displacements are derived. Chapter 3 examines ‘Ekman–Stokes’ dynamics driven
by the Stokes drift and Coriolis force within the turbulent upper ocean boundary
layer, and uses buoy data to explore the impact these dynamics have on the drift of
a floating particle. Finally, in Chapter 4 I combine the insights of the two previous
chapters to develop an analytical model capable of describing both divergence-driven and geophysically-driven Eulerian-mean flows induced by surface waves.</p> |
| first_indexed | 2024-03-06T21:11:22Z |
| format | Thesis |
| id | oxford-uuid:3e49b7da-e593-42fa-9b00-fa8cc8fbb3e1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:44:33Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | oxford-uuid:3e49b7da-e593-42fa-9b00-fa8cc8fbb3e12024-12-07T16:02:29ZSurface wave-induced Eulerian-mean flows in the open oceanThesishttp://purl.org/coar/resource_type/c_db06uuid:3e49b7da-e593-42fa-9b00-fa8cc8fbb3e1Fluid dynamicsGeophysical fluid dynamicsWave-induced transportTheoretical oceanographyEnglishHyrax Deposit2020Higgins, CJvan den Bremer, TVanneste, JAdcock, TGallet, B<p>This thesis examines Lagrangian-mean flows induced by surface gravity waves, with particular emphasis on the displacements associated with these flows. Stokes drift, the small Lagrangian-mean velocity accompanying the orbital motion of particles beneath surface waves, has been well-studied, and is proven to play a role in ocean transport. However, Eulerian-mean flows induced by slow variation of the wave field (divergence-driven), viscous effects, or geophysical effects such as density stratification and planetary rotation, have received less attention. It is the aim of this thesis to study these wave-induced Eulerian-mean flows, which must be superimposed on the Stokes drift to obtain the correct Lagrangian-mean (or mass transport) velocity induced by surface gravity waves. In Chapter 2, the effects of wave directional spread and density stratification on the mean flow induced by a surface gravity wavepacket in deep water are studied, and the corresponding displacements are derived. Chapter 3 examines ‘Ekman–Stokes’ dynamics driven by the Stokes drift and Coriolis force within the turbulent upper ocean boundary layer, and uses buoy data to explore the impact these dynamics have on the drift of a floating particle. Finally, in Chapter 4 I combine the insights of the two previous chapters to develop an analytical model capable of describing both divergence-driven and geophysically-driven Eulerian-mean flows induced by surface waves.</p> |
| spellingShingle | Fluid dynamics Geophysical fluid dynamics Wave-induced transport Theoretical oceanography Higgins, CJ Surface wave-induced Eulerian-mean flows in the open ocean |
| title | Surface wave-induced Eulerian-mean flows in the open ocean |
| title_full | Surface wave-induced Eulerian-mean flows in the open ocean |
| title_fullStr | Surface wave-induced Eulerian-mean flows in the open ocean |
| title_full_unstemmed | Surface wave-induced Eulerian-mean flows in the open ocean |
| title_short | Surface wave-induced Eulerian-mean flows in the open ocean |
| title_sort | surface wave induced eulerian mean flows in the open ocean |
| topic | Fluid dynamics Geophysical fluid dynamics Wave-induced transport Theoretical oceanography |
| work_keys_str_mv | AT higginscj surfacewaveinducedeulerianmeanflowsintheopenocean |