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    Hydraulics of Bottom Rack Intake

    Source: Journal of Hydraulic Engineering:;2003:;Volume ( 129 ):;issue: 001
    Author:
    Sandro Brunella
    ,
    Willi H. Hager
    ,
    Hans-Erwin Minor
    DOI: 10.1061/(ASCE)0733-9429(2003)129:1(2)
    Publisher: American Society of Civil Engineers
    Abstract: Bottom racks are a standard hydraulic structure used as intakes in mountainous regions, to divert water to turbines, and to retain sediment and other solid matter larger than rack spacing. These racks are also used for fish ways, and to retain floating matter. The present project was directed to explore the hydraulics of bottom rack intakes, without considering any solids in the fluid. Based on extended laboratory observations, the effect of various parameters were explored, such as the bottom slope, the rack geometry, and the rack porosity. In addition, a novel approach to determine the discharge coefficient of a rack structure was developed. Finally, the intake channel below the bottom rack was investigated and several interesting features were found, including a significant flow instability that may have a strongly adverse effect on the rack performance. Guidelines for successful rack designs are given, and the results of the present study may be readily applied.
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      Hydraulics of Bottom Rack Intake

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    contributor authorSandro Brunella
    contributor authorWilli H. Hager
    contributor authorHans-Erwin Minor
    date accessioned2017-05-08T20:44:25Z
    date available2017-05-08T20:44:25Z
    date copyrightJanuary 2003
    date issued2003
    identifier other%28asce%290733-9429%282003%29129%3A1%282%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/25444
    description abstractBottom racks are a standard hydraulic structure used as intakes in mountainous regions, to divert water to turbines, and to retain sediment and other solid matter larger than rack spacing. These racks are also used for fish ways, and to retain floating matter. The present project was directed to explore the hydraulics of bottom rack intakes, without considering any solids in the fluid. Based on extended laboratory observations, the effect of various parameters were explored, such as the bottom slope, the rack geometry, and the rack porosity. In addition, a novel approach to determine the discharge coefficient of a rack structure was developed. Finally, the intake channel below the bottom rack was investigated and several interesting features were found, including a significant flow instability that may have a strongly adverse effect on the rack performance. Guidelines for successful rack designs are given, and the results of the present study may be readily applied.
    publisherAmerican Society of Civil Engineers
    titleHydraulics of Bottom Rack Intake
    typeJournal Paper
    journal volume129
    journal issue1
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)0733-9429(2003)129:1(2)
    treeJournal of Hydraulic Engineering:;2003:;Volume ( 129 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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