Physical complexity to model morphological changes at a natural channel bend

Guan, M., Wright, N.G. ORCID: 0000-0002-1289-2830, Sleigh, P.A., Ahilan, S. and Lamb, R., 2016. Physical complexity to model morphological changes at a natural channel bend. Water Resources Research, 52 (8), pp. 6348-6364. ISSN 0043-1397

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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.

Item Type: Journal article
Publication Title: Water Resources Research
Creators: Guan, M., Wright, N.G., Sleigh, P.A., Ahilan, S. and Lamb, R.
Publisher: Wiley-Blackwell
Date: August 2016
Volume: 52
Number: 8
ISSN: 0043-1397
Identifiers:
NumberType
10.1002/2015wr017917DOI
Rights: © 2016. American Geophysical Union. All Rights Reserved.
Divisions: Professional Services > The Directorate
Depositing User: Linda Sullivan
Date Added: 29 Oct 2018 10:00
Last Modified: 18 Sep 2019 10:58
URI: http://irep.ntu.ac.uk/id/eprint/34775

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