Home > Research > Publications & Outputs > Physical complexity to model morphological chan...

Electronic data

  • Guan_et_al-2016-Water_Resources_Research

    Rights statement: An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union.

    Accepted author manuscript, 3 MB, PDF document

  • Guan_et_al-2016-Water_Resources_Research

    Rights statement: An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union.

    Final published version, 5.84 MB, PDF document

    Available under license: Unspecified

Links

Text available via DOI:

View graph of relations

Physical complexity to model morphological changes at a natural channel bend

Research output: Contribution to journalJournal articlepeer-review

Published
  • M. Guan
  • N.G. Wright
  • P.A. Sleigh
  • S. Ahilan
  • R. Lamb
Close
<mark>Journal publication date</mark>08/2016
<mark>Journal</mark>Water Resources Research
Issue number8
Volume52
Number of pages17
Pages (from-to)6348-6364
Publication StatusPublished
Early online date5/08/16
<mark>Original language</mark>English

Abstract

This study developed a two-dimensional (2D) 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 were 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 2D model to simulate morphological changes at a natural bend, and to investigate how much physical complexity is needed for reliable modelling. The results suggest that a 2D 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 parameterise 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 parameterisation should be given a first priority among other parameters when modelling bed deformation at a natural bend using a 2D model.

Bibliographic note

An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union.