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    The Dynamics of a Partially Mixed Estuary

    Source: Journal of Physical Oceanography:;2000:;Volume( 030 ):;issue: 008::page 2035
    Author:
    Geyer, W. Rockwell
    ,
    Trowbridge, John H.
    ,
    Bowen, Melissa M.
    DOI: 10.1175/1520-0485(2000)030<2035:TDOAPM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Measurements of velocity, density, and pressure gradient in the lower Hudson River estuary were used to quantify the dominant terms in the momentum equation and to characterize their variations at tidal and spring?neap timescales. The vertical momentum flux (assumed to be due mainly to turbulent shear stress) was estimated indirectly, based on the residual from the acceleration and pressure gradient terms. The indirect estimates of stress compared favorably to bottom stress estimates using a quadratic drag law, supporting the hypothesis that the tidal momentum equation involves a local balance between tidal acceleration, pressure gradient, and stress divergence. Estimates of eddy viscosity indicated that there was significant tidal asymmetry, with flood tide values exceeding ebb values by a factor of 2. As a consequence of the asymmetry, the vertical structure of the tidally averaged stress bore no resemblance to the tidally averaged shear. In spite of the asymmetry of vertical mixing, the tidally averaged, estuarine circulation was found to depend simply on the intensity of bottom turbulence, which could be parameterized by a Rayleigh drag formulation based on the tidal velocity magnitude and the tidally averaged near-bottom flow. This seemingly paradoxical result indicates that the estuarine circulation can be modeled without detailed knowledge of the effective eddy viscosity, only requiring an estimate of the bottom drag coefficient, the tidal forcing conditions, and the baroclinic pressure gradient. A notable characteristic of this solution is an inverse dependence of the estuarine circulation on the amplitude of the tides.
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      The Dynamics of a Partially Mixed Estuary

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    contributor authorGeyer, W. Rockwell
    contributor authorTrowbridge, John H.
    contributor authorBowen, Melissa M.
    date accessioned2017-06-09T14:54:09Z
    date available2017-06-09T14:54:09Z
    date copyright2000/08/01
    date issued2000
    identifier issn0022-3670
    identifier otherams-29297.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4166508
    description abstractMeasurements of velocity, density, and pressure gradient in the lower Hudson River estuary were used to quantify the dominant terms in the momentum equation and to characterize their variations at tidal and spring?neap timescales. The vertical momentum flux (assumed to be due mainly to turbulent shear stress) was estimated indirectly, based on the residual from the acceleration and pressure gradient terms. The indirect estimates of stress compared favorably to bottom stress estimates using a quadratic drag law, supporting the hypothesis that the tidal momentum equation involves a local balance between tidal acceleration, pressure gradient, and stress divergence. Estimates of eddy viscosity indicated that there was significant tidal asymmetry, with flood tide values exceeding ebb values by a factor of 2. As a consequence of the asymmetry, the vertical structure of the tidally averaged stress bore no resemblance to the tidally averaged shear. In spite of the asymmetry of vertical mixing, the tidally averaged, estuarine circulation was found to depend simply on the intensity of bottom turbulence, which could be parameterized by a Rayleigh drag formulation based on the tidal velocity magnitude and the tidally averaged near-bottom flow. This seemingly paradoxical result indicates that the estuarine circulation can be modeled without detailed knowledge of the effective eddy viscosity, only requiring an estimate of the bottom drag coefficient, the tidal forcing conditions, and the baroclinic pressure gradient. A notable characteristic of this solution is an inverse dependence of the estuarine circulation on the amplitude of the tides.
    publisherAmerican Meteorological Society
    titleThe Dynamics of a Partially Mixed Estuary
    typeJournal Paper
    journal volume30
    journal issue8
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(2000)030<2035:TDOAPM>2.0.CO;2
    journal fristpage2035
    journal lastpage2048
    treeJournal of Physical Oceanography:;2000:;Volume( 030 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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