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Numerical simulation of bank erosion and channel migration in meandering rivers

Numerical simulation of bank erosion and channel migration in meandering rivers
Numerical simulation of bank erosion and channel migration in meandering rivers
A numerical model of river morphology for meander bends with erodible cohesive banks is herein developed and tested. The new model has three key features. First, it couples a two-dimensional depth-averaged model of flow and bed topography with a mechanistic model of bank erosion. Second, it simulates the deposition of failed bank material debris at and its subsequent removal from the toe of the bank. Finally, the governing conservation equations are implemented in a moving boundary fitted coordinate system that can be both curvilinear and nonorthogonal. This simplifies grid generation in curved channels that experience bank deformation, allowing complex planform shapes associated with irregular natural channels to be simulated. Model performance is assessed using data from two flume experiments and a natural river channel. Results are encouraging, but the model underpredicts the scour depth in pools adjacent to the outer bank and, consequently, underpredicts bank migration rates.
0043-1397
1-23
Darby, S.E.
4c3e1c76-d404-4ff3-86f8-84e42fbb7970
Alabyan, A.M.
a64feca0-79ca-4b17-b658-108f5592257a
Van de Wiel, M.J.
d9df37e3-bca3-41c6-9ff5-ecaae0033b2f
Darby, S.E.
4c3e1c76-d404-4ff3-86f8-84e42fbb7970
Alabyan, A.M.
a64feca0-79ca-4b17-b658-108f5592257a
Van de Wiel, M.J.
d9df37e3-bca3-41c6-9ff5-ecaae0033b2f

Darby, S.E., Alabyan, A.M. and Van de Wiel, M.J. (2002) Numerical simulation of bank erosion and channel migration in meandering rivers. Water Resources Research, 38 (9), 1-23.

Record type: Article

Abstract

A numerical model of river morphology for meander bends with erodible cohesive banks is herein developed and tested. The new model has three key features. First, it couples a two-dimensional depth-averaged model of flow and bed topography with a mechanistic model of bank erosion. Second, it simulates the deposition of failed bank material debris at and its subsequent removal from the toe of the bank. Finally, the governing conservation equations are implemented in a moving boundary fitted coordinate system that can be both curvilinear and nonorthogonal. This simplifies grid generation in curved channels that experience bank deformation, allowing complex planform shapes associated with irregular natural channels to be simulated. Model performance is assessed using data from two flume experiments and a natural river channel. Results are encouraging, but the model underpredicts the scour depth in pools adjacent to the outer bank and, consequently, underpredicts bank migration rates.

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Published date: 6 September 2002

Identifiers

Local EPrints ID: 14948
URI: http://eprints.soton.ac.uk/id/eprint/14948
ISSN: 0043-1397
PURE UUID: 623cce4e-70f9-4368-820d-b9f53d8d69e7
ORCID for S.E. Darby: ORCID iD orcid.org/0000-0001-8778-4394

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Date deposited: 22 Mar 2005
Last modified: 18 Feb 2021 16:50

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