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dc.contributor.authorWang, F.
dc.contributor.authorHuai, W.
dc.contributor.authorGuo, Yakun
dc.contributor.authorLiu, M.
dc.date.accessioned2021-04-08T11:09:57Z
dc.date.available2021-04-08T11:09:57Z
dc.date.issued2021-04
dc.identifier.citationWang 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.en_US
dc.identifier.urihttp://hdl.handle.net/10454/18419
dc.descriptionYesen_US
dc.description.abstractIce 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.en_US
dc.description.sponsorshipNational Natural Science Foundation of China (NSFC). Grant Numbers: 52020105006, 11872285: State Key Laboratory of Water Resources and Hydropower Engineering Science (WRHES), Wuhan University. Grant Number: 2018HLG01en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1029/2020WR028621en_US
dc.rights© 2021. American Geophysical Union. All Rights Reserved. Reproduced in accordance with the publisher's self-archiving policy.en_US
dc.subjectCompound channelen_US
dc.subjectEddy viscosityen_US
dc.subjectMomentum exchangeen_US
dc.subjectShore iceen_US
dc.subjectTurbulence structureen_US
dc.titleTurbulence structure and momentum exchange in compound channel flows with shore ice covered on the floodplainsen_US
dc.status.refereedYesen_US
dc.date.Accepted2021-03-11
dc.date.application2021-03-17
dc.typeArticleen_US
dc.type.versionPublished versionen_US
refterms.dateFOA2021-04-08T11:10:31Z
dc.openaccess.statusGreenen_US


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