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    Mixing in Overland Flow during Rainfall

    Source: Journal of Environmental Engineering:;1990:;Volume ( 116 ):;issue: 004
    Author:
    R. Lee Peyton
    ,
    Thomas G. Sanders
    DOI: 10.1061/(ASCE)0733-9372(1990)116:4(764)
    Publisher: American Society of Civil Engineers
    Abstract: A method is presented for estimating vertical mixing coefficients in overland flow with rainfall using laboratory data and using a mathematical model of shear‐flow convection, rainfall dilution, and vertical mixing. The laboratory data consist of concentration‐time measurements downstream from an injection of a conservative dye into overland flow during rainfall over a smooth impervious surface with constant slope, without sediment and with flow in the laminar Reynolds number range. Results of the mathematical model are compared to the concentration time measurements to calibrate values of the vertical mixing coefficient. The calibrated values of the vertical mixing coefficient were most highly correlated to slope and a Reynolds number related to rainfall intensity. An analysis of the calibrated vertical mixing coefficient values using equations for eddy turbulence did not prove satisfactory.
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      Mixing in Overland Flow during Rainfall

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    http://yetl.yabesh.ir/yetl1/handle/yetl/38531
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    contributor authorR. Lee Peyton
    contributor authorThomas G. Sanders
    date accessioned2017-05-08T21:05:50Z
    date available2017-05-08T21:05:50Z
    date copyrightJuly 1990
    date issued1990
    identifier other%28asce%290733-9372%281990%29116%3A4%28764%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/38531
    description abstractA method is presented for estimating vertical mixing coefficients in overland flow with rainfall using laboratory data and using a mathematical model of shear‐flow convection, rainfall dilution, and vertical mixing. The laboratory data consist of concentration‐time measurements downstream from an injection of a conservative dye into overland flow during rainfall over a smooth impervious surface with constant slope, without sediment and with flow in the laminar Reynolds number range. Results of the mathematical model are compared to the concentration time measurements to calibrate values of the vertical mixing coefficient. The calibrated values of the vertical mixing coefficient were most highly correlated to slope and a Reynolds number related to rainfall intensity. An analysis of the calibrated vertical mixing coefficient values using equations for eddy turbulence did not prove satisfactory.
    publisherAmerican Society of Civil Engineers
    titleMixing in Overland Flow during Rainfall
    typeJournal Paper
    journal volume116
    journal issue4
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/(ASCE)0733-9372(1990)116:4(764)
    treeJournal of Environmental Engineering:;1990:;Volume ( 116 ):;issue: 004
    contenttypeFulltext
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