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Estimation of flow direction in meandering compound channels
Liu, X. Zhou, Q. Huang, S. Liu, C.
Liu, X.
Zhou, Q.
Huang, S.
Liu, C.
Publication Date
2018-01
End of Embargo
Supervisor
Rights
© 2017 Elsevier B.V. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2017-10-27
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Department
Awarded
Embargo end date
Additional title
Abstract
The flow in the main channel of a meandering compound channel does not occur in the ridge direction because of the effect of the upstream floodplain flows. This study proposes a model for estimating the flow direction in the depth-averaged two-dimensional domain (depth-averaged flow angles) between the entrance and the apex sections. Detailed velocity measurements were performed in the region between the meander entrance section and apex section in a large-scale meandering compound channel. The vertical size of the secondary current cell is highly related to the depth-averaged flow angle; thus, the means of the local flow angles above the secondary current cell and within the cell are separately discussed. The experimental measurements indicate that the mean local flow angle above the cell is equal to the section angle, whereas the mean local flow angle within the cell is equal to zero. The proposed model is validated using published data from five sources. Good agreement is obtained between the predictions and measurements, indicating that the proposed model can accurately estimate the depth-averaged flow direction in the meandering compound channels. Finally, the limitations and application ranges of the model are discussed.
Version
Accepted manuscript
Citation
Liu X, Zhou Q, Huang S et al (2018) Estimation of flow direction in meandering compound channels. Journal of Hydrology. 556: 143-153.
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Type
Article