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    Submerged flexible vegetation impact on open channel flow velocity distribution: An analytical modelling study on drag and friction

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    Pu_et_al_Water_Science_and_Engineering_Final.pdf (1.176Mb)
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    Publication date
    2019-06
    Author
    Pu, Jaan H.
    Hussain, Awesar
    Guo, Yakun
    Vardakastanis, Nikolaos
    Hanmaiahgari, P.R.
    Lam, Dennis
    Keyword
    Analytical model
    Flexible vegetation
    Flow velocity
    Friction
    Drag
    Submerged vegetation
    Rights
    © 2019 Hohai University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
    Peer-Reviewed
    Yes
    
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    Abstract
    In this paper, an analytical model that represents the streamwise velocity distribution for open channel flow with submerged flexible vegetation is studied. In the present vegetated flow modelling, the whole flow field has been separated into two layers vertically: a vegetated layer and a non-vegetated free-water layer. Within the vegetated layer, an analysis of the mechanisms affecting water flow through flexible vegetation has been conducted. In the non-vegetated layer, a modified log-law equation that represents the velocity profile varying with vegetation height has been investigated. Based on the studied analytical model, a sensitivity analysis has been conducted to assess the influences of the drag and friction coefficients on the flow velocity. The investigated ranges of drag and friction coefficients have also been compared to published values. The findings suggest that the drag and friction coefficient values are non-constant at different depths and vegetation densities, unlike the constant values commonly suggested in literature. This phenomenon is particularly clear for flows with flexible vegetation, which is characterised by large deflection.
    URI
    http://hdl.handle.net/10454/17136
    Version
    Published version
    Citation
    Pu JH, Hussain A, Guo Y et al (2019) Submerged flexible vegetation impact on open channel flow velocity distribution: An analytical modelling study on drag and friction. Water Science and Engineering. 12(2): 121-128.
    Link to publisher’s version
    https://doi.org/10.1016/j.wse.2019.06.003
    Type
    Article
    Collections
    Engineering and Informatics Publications

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