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    Interactions between Internal Waves and Boundary Layer Vortices

    Source: Journal of Physical Oceanography:;1997:;Volume( 027 ):;issue: 001::page 62
    Author:
    Thorpe, S. A.
    DOI: 10.1175/1520-0485(1997)027<0062:IBIWAB>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The effect of internal waves on linear vortices in a homogeneous boundary layer is examined by taking a simple model with a horizontal array of line vortices or vortex cells lying in a layer bounded above by a rigid plane and below by a density interface on which interfacial waves are free to propagate. The interfacial waves stretch, compress, and displace the vortices, so changing their vorticity, orientation, and separation by amounts that are estimated. As a consequence, the instability of an array of vortices of alternating signs is enhanced in regions that depend on the local phase of the interfacial waves. The vortices force secondary disturbances on the wave-perturbed density interface. For parameter values typical of the ocean, the potential energy associated with these disturbances may be comparable with the kinetic energy in the vortices. The energy required to drive the vortices is therefore greater than that in the absence of internal waves, and this may affect the growth and development of the vortices. The presence of a density interface at the foot of the mixed layer, however, increases the primary rate of growth of Langmuir circulation in comparison with that found when the lower boundary is rigid. The subsequent instability is also enhanced. In consequence Langmuir cells in mixed layers overlying stratified water are expected to grow more rapidly and to be more unstable than those developing in a homogeneous layer of the same depth overlying a rigid bottom. The effect of codirectional shear and Stokes drift included in the Craik?Leibovich equations is to reduce the phase speed of internal waves that propagate normal to the mean flow.
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      Interactions between Internal Waves and Boundary Layer Vortices

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    contributor authorThorpe, S. A.
    date accessioned2017-06-09T14:52:24Z
    date available2017-06-09T14:52:24Z
    date copyright1997/01/01
    date issued1997
    identifier issn0022-3670
    identifier otherams-28642.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165781
    description abstractThe effect of internal waves on linear vortices in a homogeneous boundary layer is examined by taking a simple model with a horizontal array of line vortices or vortex cells lying in a layer bounded above by a rigid plane and below by a density interface on which interfacial waves are free to propagate. The interfacial waves stretch, compress, and displace the vortices, so changing their vorticity, orientation, and separation by amounts that are estimated. As a consequence, the instability of an array of vortices of alternating signs is enhanced in regions that depend on the local phase of the interfacial waves. The vortices force secondary disturbances on the wave-perturbed density interface. For parameter values typical of the ocean, the potential energy associated with these disturbances may be comparable with the kinetic energy in the vortices. The energy required to drive the vortices is therefore greater than that in the absence of internal waves, and this may affect the growth and development of the vortices. The presence of a density interface at the foot of the mixed layer, however, increases the primary rate of growth of Langmuir circulation in comparison with that found when the lower boundary is rigid. The subsequent instability is also enhanced. In consequence Langmuir cells in mixed layers overlying stratified water are expected to grow more rapidly and to be more unstable than those developing in a homogeneous layer of the same depth overlying a rigid bottom. The effect of codirectional shear and Stokes drift included in the Craik?Leibovich equations is to reduce the phase speed of internal waves that propagate normal to the mean flow.
    publisherAmerican Meteorological Society
    titleInteractions between Internal Waves and Boundary Layer Vortices
    typeJournal Paper
    journal volume27
    journal issue1
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1997)027<0062:IBIWAB>2.0.CO;2
    journal fristpage62
    journal lastpage71
    treeJournal of Physical Oceanography:;1997:;Volume( 027 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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