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    Bottom Stress Estimates and their Prediction on the Northern California Continental Shelf during CODE-1: The Importance of Wave-Current Interaction

    Source: Journal of Physical Oceanography:;1984:;Volume( 014 ):;issue: 003::page 506
    Author:
    Grant, William D.
    ,
    Williams, Albert J.
    ,
    Glenn, Scott M.
    DOI: 10.1175/1520-0485(1984)014<0506:BSEATP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: High quality near-bottom boundary layer measurements obtained at a midshelf location (90 m water depth) in the CODE region off Northern California are described. Bottom tripod velocity measurements and supporting data obtained during typical spring and early summer conditions (June 1981 during CODE-1) are analyzed to obtain bath velocity profiles and mean bottom stress and bottom roughness estimates. During the time period described, the mean near-bottom (<2 m) velocity profile are highly logarithmic (R>0.997) approximately 30 percent of the time. Effects induced by unsteadiness from internal waves result in some degradation of the profiles (0.96≤R≤0.997) the rest of the time. Mean stress profiles indicate the logarithmic layer is approximately a constant-stress layer. The near-bottom flow field is Composed of mean currents and oscillatory currents due to well. Typing mean u* values estimated from measurements greater than 30 cm above the bottom have magnitudes of 0.5?1.0 cm s?1. Mean stress values are three to seven times larger than expected from predictions using a typical smooth-bottom drag coefficient and one-and-one-half to three-and-one-half times larger than expected for predictions using a drag coefficient based on the observed rough bottom. Corresponding z0 values have magnitude of approximately 1 cm, an order of magnitude larger than the observed physical bottom roughness. These values are demonstrated to he consistent with those expected from theoretical models for combined wave and current flows. The u* values estimated from the CODE-1 data and predicted by the Grant and Madsen model typically agree within 10?15 percent. The waves influencing the midshelf bottom-stress estimates are 12?20 second swell associated with distant Pacific storms. Them waves are present over most of the year. The results demonstrate that waves must be taken into account in predicting bottom stress over the Northern California Shelf and that these predictions can be made using existing theory.
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      Bottom Stress Estimates and their Prediction on the Northern California Continental Shelf during CODE-1: The Importance of Wave-Current Interaction

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4163588
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    • Journal of Physical Oceanography

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    contributor authorGrant, William D.
    contributor authorWilliams, Albert J.
    contributor authorGlenn, Scott M.
    date accessioned2017-06-09T14:47:00Z
    date available2017-06-09T14:47:00Z
    date copyright1984/03/01
    date issued1984
    identifier issn0022-3670
    identifier otherams-26669.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4163588
    description abstractHigh quality near-bottom boundary layer measurements obtained at a midshelf location (90 m water depth) in the CODE region off Northern California are described. Bottom tripod velocity measurements and supporting data obtained during typical spring and early summer conditions (June 1981 during CODE-1) are analyzed to obtain bath velocity profiles and mean bottom stress and bottom roughness estimates. During the time period described, the mean near-bottom (<2 m) velocity profile are highly logarithmic (R>0.997) approximately 30 percent of the time. Effects induced by unsteadiness from internal waves result in some degradation of the profiles (0.96≤R≤0.997) the rest of the time. Mean stress profiles indicate the logarithmic layer is approximately a constant-stress layer. The near-bottom flow field is Composed of mean currents and oscillatory currents due to well. Typing mean u* values estimated from measurements greater than 30 cm above the bottom have magnitudes of 0.5?1.0 cm s?1. Mean stress values are three to seven times larger than expected from predictions using a typical smooth-bottom drag coefficient and one-and-one-half to three-and-one-half times larger than expected for predictions using a drag coefficient based on the observed rough bottom. Corresponding z0 values have magnitude of approximately 1 cm, an order of magnitude larger than the observed physical bottom roughness. These values are demonstrated to he consistent with those expected from theoretical models for combined wave and current flows. The u* values estimated from the CODE-1 data and predicted by the Grant and Madsen model typically agree within 10?15 percent. The waves influencing the midshelf bottom-stress estimates are 12?20 second swell associated with distant Pacific storms. Them waves are present over most of the year. The results demonstrate that waves must be taken into account in predicting bottom stress over the Northern California Shelf and that these predictions can be made using existing theory.
    publisherAmerican Meteorological Society
    titleBottom Stress Estimates and their Prediction on the Northern California Continental Shelf during CODE-1: The Importance of Wave-Current Interaction
    typeJournal Paper
    journal volume14
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1984)014<0506:BSEATP>2.0.CO;2
    journal fristpage506
    journal lastpage527
    treeJournal of Physical Oceanography:;1984:;Volume( 014 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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