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    Estimate of Zero-Plane Displacement for Open-Channel Flows with Submerged Rigid Vegetation

    Source: Journal of Engineering Mechanics:;2024:;Volume ( 150 ):;issue: 010::page 04024077-1
    Author:
    Ran-Ran Mao
    ,
    Ning Liu
    ,
    Nian-Sheng Cheng
    DOI: 10.1061/JENMDT.EMENG-7719
    Publisher: American Society of Civil Engineers
    Abstract: Zero-plane is an important reference level included in the logarithmic velocity profile. The prediction of the zero-plane displacement remains challenging, especially in open-channel flows with submerged vegetation. In this study, we first review the existing formulas for estimating the zero-plane displacement. Then, we conducted a series of laboratory experiments of open-channel flows with submerged rigid vegetation, by varying flow rate, water depth, vegetation density, and stem diameter. By utilizing particle image velocimetry (PIV) technique, the spatio-temporal averaged (double-averaged) flow velocity and Reynolds shear stress profiles were obtained. The data analysis shows that the zero-plane displacement is almost proportional to the surface layer depth for the shallow flow cases. As the flow depth increases, the zero-plane displacement tends to be constant and increases with decreasing vegetation density. This result substantiates the hypothesis that the zero-plane displacement is related to large-scale eddies. Lastly, a heuristic model is developed to explain possible variations of the large-scale eddies, which yields a formula for predicting the zero-plane displacement for flows subjected to submerged rigid vegetation.
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      Estimate of Zero-Plane Displacement for Open-Channel Flows with Submerged Rigid Vegetation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4298905
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    contributor authorRan-Ran Mao
    contributor authorNing Liu
    contributor authorNian-Sheng Cheng
    date accessioned2024-12-24T10:25:49Z
    date available2024-12-24T10:25:49Z
    date copyright10/1/2024 12:00:00 AM
    date issued2024
    identifier otherJENMDT.EMENG-7719.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4298905
    description abstractZero-plane is an important reference level included in the logarithmic velocity profile. The prediction of the zero-plane displacement remains challenging, especially in open-channel flows with submerged vegetation. In this study, we first review the existing formulas for estimating the zero-plane displacement. Then, we conducted a series of laboratory experiments of open-channel flows with submerged rigid vegetation, by varying flow rate, water depth, vegetation density, and stem diameter. By utilizing particle image velocimetry (PIV) technique, the spatio-temporal averaged (double-averaged) flow velocity and Reynolds shear stress profiles were obtained. The data analysis shows that the zero-plane displacement is almost proportional to the surface layer depth for the shallow flow cases. As the flow depth increases, the zero-plane displacement tends to be constant and increases with decreasing vegetation density. This result substantiates the hypothesis that the zero-plane displacement is related to large-scale eddies. Lastly, a heuristic model is developed to explain possible variations of the large-scale eddies, which yields a formula for predicting the zero-plane displacement for flows subjected to submerged rigid vegetation.
    publisherAmerican Society of Civil Engineers
    titleEstimate of Zero-Plane Displacement for Open-Channel Flows with Submerged Rigid Vegetation
    typeJournal Article
    journal volume150
    journal issue10
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/JENMDT.EMENG-7719
    journal fristpage04024077-1
    journal lastpage04024077-12
    page12
    treeJournal of Engineering Mechanics:;2024:;Volume ( 150 ):;issue: 010
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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