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Title: Physical complexity to model morphological changes at a natural channel bend
Authors: Guan, Mingfu
Wright, N.G.
Sleigh, P.A.
Ahilan, Sangaralingam
Lamb, R.
Issue Date: 2016
Publisher: © American Geophysical Union
Citation: GUAN, M. ... et al, 2016. Physical complexity to model morphological changes at a natural channel bend. Water Resources Research, 52 (8), pp. 6348-6364.
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.
Description: An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union. The final published version can be found here http://dx.doi.org/10.1002/2015WR017917
Version: Published
DOI: 10.1002/2015WR017917
URI: https://dspace.lboro.ac.uk/2134/22826
Publisher Link: http://dx.doi.org/10.1002/2015WR017917
ISSN: 0043-1397
Appears in Collections:Published Articles (Geography and Environment)

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