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    Hydraulic Control of Sill Flow with Bottom Friction

    Source: Journal of Physical Oceanography:;1986:;Volume( 016 ):;issue: 011::page 1970
    Author:
    Pratt, L. J.
    DOI: 10.1175/1520-0485(1986)016<1970:HCOSFW>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The hydraulics of strait and sill flow with friction is examined using a reduced gravity model. It is shown that friction moves the critical (or control) point from the sill to a location downstream. If the strait has constant width, the control point lies where the bottom slope is the negative of the drag coefficient Cd. If -Cd exceeds the bottom slope everywhere, the flow cannot be controlled (in the classical sense that energy and flow force are minimized). Friction also decreases the minimum obstacle height required to establish hydraulically controlled flow in the classical laboratory towing experiment. Also, friction greatly encourages the establishment of stationary hydraulic jumps in the lee of the sill and, under certain conditions, gives rise to stationary jumps on the upstream face of the obstacle. Some consequences of these results for deep-ocean overflows are given using the Iceland-Faroe overflow as an example.
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      Hydraulic Control of Sill Flow with Bottom Friction

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    contributor authorPratt, L. J.
    date accessioned2017-06-09T14:48:09Z
    date available2017-06-09T14:48:09Z
    date copyright1986/11/01
    date issued1986
    identifier issn0022-3670
    identifier otherams-27095.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4164062
    description abstractThe hydraulics of strait and sill flow with friction is examined using a reduced gravity model. It is shown that friction moves the critical (or control) point from the sill to a location downstream. If the strait has constant width, the control point lies where the bottom slope is the negative of the drag coefficient Cd. If -Cd exceeds the bottom slope everywhere, the flow cannot be controlled (in the classical sense that energy and flow force are minimized). Friction also decreases the minimum obstacle height required to establish hydraulically controlled flow in the classical laboratory towing experiment. Also, friction greatly encourages the establishment of stationary hydraulic jumps in the lee of the sill and, under certain conditions, gives rise to stationary jumps on the upstream face of the obstacle. Some consequences of these results for deep-ocean overflows are given using the Iceland-Faroe overflow as an example.
    publisherAmerican Meteorological Society
    titleHydraulic Control of Sill Flow with Bottom Friction
    typeJournal Paper
    journal volume16
    journal issue11
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1986)016<1970:HCOSFW>2.0.CO;2
    journal fristpage1970
    journal lastpage1980
    treeJournal of Physical Oceanography:;1986:;Volume( 016 ):;issue: 011
    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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