Guan, M, Wright, NG, Sleigh, PA et al. (2 more authors) (2016) Physical complexity to model morphological changes at a natural channel bend. Water Resources Research, 52 (8). pp. 6348-6364. ISSN 0043-1397
Abstract
This study developed a two-dimensional (2-D) depth-averaged model for morphological changes at natural bends by including a secondary flow correction. The model was tested in two laboratory-scale events. A field study was further adopted to demonstrate the capability of the model in predicting bed deformation at natural bends. Further, a series of scenarios with different setups of sediment-related parameters were tested to explore the possibility of a 2-D model to simulate morphological changes at a natural bend, and to investigate how much physical complexity is needed for reliable modeling. The results suggest that a 2-D depth-averaged model can reconstruct the hydrodynamic and morphological features at a bend reasonably provided that the model addresses a secondary flow correction, and reasonably parameterize grain-sizes within a channel in a pragmatic way. The factors, such as sediment transport formula and roughness height, have relatively less significance on the bed change pattern at a bend. The study reveals that the secondary flow effect and grain-size parameterization should be given a first priority among other parameters when modeling bed deformation at a natural bend using a 2-D model.
Metadata
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Copyright, Publisher and Additional Information: | © 2016, American Geophysical Union. This is an author produced version of a paper published in Water Resources Research. Uploaded with permission from the publisher. | ||||||
Keywords: | secondary flow; sediment transport; depth-integrated model; channel bend | ||||||
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Institution: | The University of Leeds | ||||||
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Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 04 Aug 2016 11:08 | ||||||
Last Modified: | 03 Nov 2017 21:11 | ||||||
Published Version: | http://dx.doi.org/10.1002/2015WR017917 | ||||||
Status: | Published | ||||||
Publisher: | American Geophysical Union (AGU) | ||||||
Identification Number: | https://doi.org/10.1002/2015WR017917 |