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    Turbulence structure and momentum exchange in compound channel flows with shore ice covered on the floodplains

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    Publication date
    2021-04
    End of Embargo
    2021-09-17
    Author
    Wang, F.
    Huai, W.
    Guo, Yakun
    Liu, M.
    Keyword
    Compound channel
    Eddy viscosity
    Momentum exchange
    Shore ice
    Turbulence structure
    Rights
    © 2021. American Geophysical Union. All Rights Reserved. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    Open Access status
    Green
    
    Metadata
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    Abstract
    Ice cover formed on a river surface is a common natural phenomenon during winter season in cold high latitude northern regions. For the ice-covered river with compound cross-section, the interaction of the turbulence caused by the ice cover and the channel bed bottom affects the transverse mass and momentum exchange between the main channel and floodplains. In this study, laboratory experiments are performed to investigate the turbulent flow of a compound channel with shore ice covered on the floodplains. Results show that the shore ice resistance restricts the development of the water flow and creates a relatively strong shear layer near the edge of the ice-covered floodplain. The mean streamwise velocity in the main channel and on the ice-covered floodplains shows an opposite variation pattern along with the longitudinal distance and finally reaches the longitudinal uniformity. The mixing layer bounded by the velocity inflection point consists of two layers that evolve downstream to their respective fully developed states. The velocity inflection point and strong transverse shear near the interface in the fully developed profile generate the Kelvin-Helmholtz instability and horizontal coherent vortices. These coherent vortices induce quasi-periodic velocity oscillations, while the dominant frequency of the vortical energy is determined through the power spectral analysis. Subsequently, quadrant analysis is used in ascertaining the mechanism for the lateral momentum exchange, which exhibits the governing contributions of sweeps and ejections within the vortex center. Finally, an eddy viscosity model is presented to investigate the transverse momentum exchange. The presented model is well validated through comparison with measurements, whereas the constants α and β appeared in the model need to be further investigated.
    URI
    http://hdl.handle.net/10454/18419
    Version
    Published version
    Citation
    Wang F, Huai W, Guo Y et al (2021) Turbulence structure and momentum exchange in compound channel flows with shore ice covered on the floodplains. Water Resources Research. 57(4): e2020WR028621.
    Link to publisher’s version
    https://doi.org/10.1029/2020WR028621
    Type
    Article
    Notes
    The full-text of this article will be released for public view at the end of the publisher embargo on 17 Sep 2021.
    Collections
    Engineering and Informatics Publications

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