Assessing the effect of groynes orientation on near-bank flow and morphology in a natural meander bend using 2D numerical simulation

S. Karki, H. Nakagawa, K. Kawaike, M. Hashimoto, Y. Hasegawa

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

    Abstract

    A coupled (hydrodynamics and sediment transport) two-dimensional numerical model is formulated based on the source code of Telamac-2D model and validated against the experimental data before applying it to a natural meander bend of Gowain River located in North-eastern part of Bangladesh. Impermeable groynes at 90° and 120° to the bank were implemented to examine their effect on modifying the near-bank hydro-morphological phenomena. Both orientation, reduced the near bank velocity and bed shear stress. Groynes oriented at 90° were more effective in shifting the high-velocity away from the banks but could promote greater erosion behind the initial groynes at the entry of the bend. On the other hand, groynes placed at 120° induced greater deposition around the initial groynes. Therefore it is suggested that rather than adopting a single orientation, a combination of two or more arrangements would enhance the effectiveness of the groynes.

    Original languageEnglish
    Title of host publicationRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics
    EditorsWim Uijttewaal, Mario J. Franca, Daniel Valero, Victor Chavarrias, Claudia Ylla Arbos, Ralph Schielen, Ralph Schielen, Alessandra Crosato
    PublisherCRC Press/Balkema
    Pages626-634
    Number of pages9
    ISBN (Electronic)9780367627737
    Publication statusPublished - 2020
    Event10th Conference on Fluvial Hydraulics, River Flow 2020 - Virtual, Online, Netherlands
    Duration: 2020 Jul 72020 Jul 10

    Publication series

    NameRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics

    Conference

    Conference10th Conference on Fluvial Hydraulics, River Flow 2020
    Country/TerritoryNetherlands
    CityVirtual, Online
    Period20/7/720/7/10

    ASJC Scopus subject areas

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

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