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    Measurement of the Rates of Production and Dissipation of Turbulent Kinetic Energy in an Energetic Tidal Flow: Red Wharf Bay Revisited

    Source: Journal of Physical Oceanography:;2003:;Volume( 033 ):;issue: 009::page 1889
    Author:
    Rippeth, Tom P.
    ,
    Simpson, John H.
    ,
    Williams, Eirwen
    ,
    Inall, Mark E.
    DOI: 10.1175/1520-0485(2003)033<1889:MOTROP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Simultaneous measurements of the rates of turbulent kinetic energy (TKE) dissipation (ε) and production (P) have been made over a period of 24 h at a tidally energetic site in the northern Irish Sea in water of 25-m depth. Some ε profiles from ?5 m below the surface to 15 cm above the seabed were obtained using a fast light yo-yo (FLY) microstructure profiler, while P profiles were determined from a bottom-mounted high-frequency acoustic Doppler current profiler (ADCP) using the variance method. In homogeneous flow of the kind observed, the turbulence regime should approximate to local equilibrium so that, with no buoyancy forces involved, ε and P are expected to covary with mean values that are equal. The results show a close tracking of ε and P for most of the observational period. For the second tidal cycle, when there was no significant surface wave activity, a mean ratio of ε/P ? 0.63 ± 0.17 was obtained. Although this is a significant deviation from unity, it is within the range of uncertainty previously reported for the ε measurements. A marked phase lag of between 5 and 20 min between the maximum P and the maximum ε is interpreted using a simple model in terms of the decay rate of TKE. Consideration of inherent instrument noise has enabled an estimate of the lowest P threshold measurable using the variance technique. For the chosen averaging parameters a value of Pmin ? 7 ? 10?5 W m?3 is estimated. Two other significant differences between the two sets of measurements are attributed to errors in the stress estimate. The first is a bias in the estimate of stress resulting from a combination of instrument tilt (1°?3.5°) and surface wave activity. The second are anomalously high stress estimates, covering nearly one-half of the water column at times, which are thought to be due to instrument noise associated with the large wave orbital velocities.
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      Measurement of the Rates of Production and Dissipation of Turbulent Kinetic Energy in an Energetic Tidal Flow: Red Wharf Bay Revisited

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4167196
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    contributor authorRippeth, Tom P.
    contributor authorSimpson, John H.
    contributor authorWilliams, Eirwen
    contributor authorInall, Mark E.
    date accessioned2017-06-09T14:55:55Z
    date available2017-06-09T14:55:55Z
    date copyright2003/09/01
    date issued2003
    identifier issn0022-3670
    identifier otherams-29916.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4167196
    description abstractSimultaneous measurements of the rates of turbulent kinetic energy (TKE) dissipation (ε) and production (P) have been made over a period of 24 h at a tidally energetic site in the northern Irish Sea in water of 25-m depth. Some ε profiles from ?5 m below the surface to 15 cm above the seabed were obtained using a fast light yo-yo (FLY) microstructure profiler, while P profiles were determined from a bottom-mounted high-frequency acoustic Doppler current profiler (ADCP) using the variance method. In homogeneous flow of the kind observed, the turbulence regime should approximate to local equilibrium so that, with no buoyancy forces involved, ε and P are expected to covary with mean values that are equal. The results show a close tracking of ε and P for most of the observational period. For the second tidal cycle, when there was no significant surface wave activity, a mean ratio of ε/P ? 0.63 ± 0.17 was obtained. Although this is a significant deviation from unity, it is within the range of uncertainty previously reported for the ε measurements. A marked phase lag of between 5 and 20 min between the maximum P and the maximum ε is interpreted using a simple model in terms of the decay rate of TKE. Consideration of inherent instrument noise has enabled an estimate of the lowest P threshold measurable using the variance technique. For the chosen averaging parameters a value of Pmin ? 7 ? 10?5 W m?3 is estimated. Two other significant differences between the two sets of measurements are attributed to errors in the stress estimate. The first is a bias in the estimate of stress resulting from a combination of instrument tilt (1°?3.5°) and surface wave activity. The second are anomalously high stress estimates, covering nearly one-half of the water column at times, which are thought to be due to instrument noise associated with the large wave orbital velocities.
    publisherAmerican Meteorological Society
    titleMeasurement of the Rates of Production and Dissipation of Turbulent Kinetic Energy in an Energetic Tidal Flow: Red Wharf Bay Revisited
    typeJournal Paper
    journal volume33
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(2003)033<1889:MOTROP>2.0.CO;2
    journal fristpage1889
    journal lastpage1901
    treeJournal of Physical Oceanography:;2003:;Volume( 033 ):;issue: 009
    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