Numerical simulation of bank erosion and channel migration in meandering rivers

Stephen E. Darby, Andrei M. Alabyan, Marco J. Van de Wiel

Research output: Contribution to journalArticle

174 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)201-221
Number of pages21
JournalWater Resources Research
Volume38
Issue number9
Early online date6 Sep 2002
DOIs
Publication statusPublished - Sep 2002
Externally publishedYes

Fingerprint

bank erosion
Banks (bodies of water)
Erosion
Rivers
rivers
Computer simulation
river
simulation
Planforms
flume experiment
Scour
mechanistic models
meander
scour
river channel
Debris
Topography
topography
Numerical models
Conservation

Keywords

  • Bank erosion
  • Bed topography
  • Meander migration
  • Numerical modeling
  • River bends

ASJC Scopus subject areas

  • Aquatic Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology

Cite this

Numerical simulation of bank erosion and channel migration in meandering rivers. / Darby, Stephen E.; Alabyan, Andrei M.; Van de Wiel, Marco J.

In: Water Resources Research, Vol. 38, No. 9, 09.2002, p. 201-221.

Research output: Contribution to journalArticle

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