Modeling of vegetated rivers for inbank and overbank flows

K. Shiono, M. Takeda, K. Yang, Yuji Sugihara, T. Ishigaki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    Model pparameters such as friction factor and eddy viscosity in the Shiono & Knight method (SKM) are considered through experimental data obtained from a vegetated open channel. The experiment was conducted in a rectangular open channel with cylindrical rods as vegetation. Velocity, Reynolds stresses and boundary shear stress were measured with Acoustic Doppler Velocimetry (ADV) and a Preston tube respectively. Both friction factor and eddy viscosity were calculated using the measured data and found to be not constant in the shear layer generated by rods. The analytical solutions of SKM to predict velocity and boundary shear stress currently in use were based on the constant assumption of these parameters. In this paper a new analytical solution was derived by taking into a variation of these parameters account and was also verified with the experimental data. This solution was also applied to flow in compound channel with vegetation. The new solution gives a good prediction of the lateral distribution of depth-averaged velocity and boundary shear stress in vegetated channels, and it predicts the boundary shear stress better than that of the original solution without considering the secondary flow term in particular.

    Original languageEnglish
    Title of host publicationRiver Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics
    Pages263-269
    Number of pages7
    Publication statusPublished - Nov 1 2012
    EventInternational Conference on Fluvial Hydraulics, River Flow 2012 - San Jose, Costa Rica
    Duration: Sep 5 2012Sep 7 2012

    Publication series

    NameRiver Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics
    Volume1

    Other

    OtherInternational Conference on Fluvial Hydraulics, River Flow 2012
    CountryCosta Rica
    CitySan Jose
    Period9/5/129/7/12

    All Science Journal Classification (ASJC) codes

    • Fluid Flow and Transfer Processes
    • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Shiono, K., Takeda, M., Yang, K., Sugihara, Y., & Ishigaki, T. (2012). Modeling of vegetated rivers for inbank and overbank flows. In River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics (pp. 263-269). (River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics; Vol. 1).