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    Diapycnal Transport and Mixing Efficiency in Stratified Boundary Layers near Sloping Topography

    Source: Journal of Physical Oceanography:;2010:;Volume( 041 ):;issue: 002::page 329
    Author:
    Umlauf, Lars
    ,
    Burchard, Hans
    DOI: 10.1175/2010JPO4438.1
    Publisher: American Meteorological Society
    Abstract: The interaction of shear, stratification, and turbulence in boundary layers on sloping topography is investigated with the help of an idealized theoretical model, assuming uniform bottom slope and homogeneity in the upslope direction. It is shown theoretically that the irreversible vertical buoyancy flux generated in the boundary layer is directly proportional to the molecular destruction rate of small-scale buoyancy variance, which can be inferred, for example, from microstructure observations. Dimensional analysis of the equations shows that, for harmonic boundary layer forcing and no rotation, the problem is governed by three nondimensional parameters (slope angle, roughness number, and ratio of forcing and buoyancy frequencies). Solution of the equations with a second-moment closure model for the turbulent fluxes reveals the periodic generation of gravitationally unstable boundary layers during upslope flow, consistent with available observations. Investigation of the nondimensional parameter space with the help of this model illustrates a systematic increase of the bulk mixing efficiencies for (i) steep slopes and (ii) low-frequency forcing. Except for very steep slopes, mixing efficiencies are substantially smaller than the classical value of Γ = 0.2.
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      Diapycnal Transport and Mixing Efficiency in Stratified Boundary Layers near Sloping Topography

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4212826
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    contributor authorUmlauf, Lars
    contributor authorBurchard, Hans
    date accessioned2017-06-09T16:36:58Z
    date available2017-06-09T16:36:58Z
    date copyright2011/02/01
    date issued2010
    identifier issn0022-3670
    identifier otherams-70985.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212826
    description abstractThe interaction of shear, stratification, and turbulence in boundary layers on sloping topography is investigated with the help of an idealized theoretical model, assuming uniform bottom slope and homogeneity in the upslope direction. It is shown theoretically that the irreversible vertical buoyancy flux generated in the boundary layer is directly proportional to the molecular destruction rate of small-scale buoyancy variance, which can be inferred, for example, from microstructure observations. Dimensional analysis of the equations shows that, for harmonic boundary layer forcing and no rotation, the problem is governed by three nondimensional parameters (slope angle, roughness number, and ratio of forcing and buoyancy frequencies). Solution of the equations with a second-moment closure model for the turbulent fluxes reveals the periodic generation of gravitationally unstable boundary layers during upslope flow, consistent with available observations. Investigation of the nondimensional parameter space with the help of this model illustrates a systematic increase of the bulk mixing efficiencies for (i) steep slopes and (ii) low-frequency forcing. Except for very steep slopes, mixing efficiencies are substantially smaller than the classical value of Γ = 0.2.
    publisherAmerican Meteorological Society
    titleDiapycnal Transport and Mixing Efficiency in Stratified Boundary Layers near Sloping Topography
    typeJournal Paper
    journal volume41
    journal issue2
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2010JPO4438.1
    journal fristpage329
    journal lastpage345
    treeJournal of Physical Oceanography:;2010:;Volume( 041 ):;issue: 002
    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
    yabeshDSpacePersian