Simulating sine-generated meandering channel evolution with an analytical model

D. Chen, Guohong Duan

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

An analytical model to simulate the evolution of a meandering channel was developed based on the analytical solution of flow field in a sine-generated meandering channel and application of the bank erosion model by Duan et al. The flow-field solution was derived from two-dimensional, depth-averaged, steady-flow equations in channel-fitted, curvilinear orthogonal coordinates where the transverse bed slope was treated as a variable increasing with channel sinuosity. The flow-field solution indicated that the location where the shift of maximum velocity zone from the convex to concave banks in sine-generated channels varies with the transverse bed slope and the strength of secondary current. The rate of bank erosion was calculated as a gradient function of the longitudinal sediment transport rate and strength of the secondary flow rather than being proportional to the magnitude of excessive near-bank velocity or shear stress. This model replicated the evolution of meandering channels from mildly to highly sinuous ones. Simulation results showed the migration of meandering channel is a combination of downstream translation, lateral extension, expansion, and downstream and upstream rotation. Low-sinuous free meanders migrate rapidly toward downstream. As the sinuosity increases, downstream translation diminishes, and meandering loops expand laterally with its head rotating toward downstream and then upstream. The simulated results indicated the gradient of the longitudinal sediment transport rate is essential in modeling meandering evolution.

Original languageEnglish (US)
Pages (from-to)363-373
Number of pages11
JournalJournal of Hydraulic Research
Volume44
Issue number3
StatePublished - 2006
Externally publishedYes

Fingerprint

Analytical models
Flow fields
Sediment transport
Erosion
flow field
Secondary flow
Steady flow
bank erosion
Shear stress
sediment transport
secondary flow
steady flow
meander
shear stress
modeling
simulation
rate

Keywords

  • Bank erosion
  • Meander
  • Model
  • Secondary flow
  • Sediment transport
  • Theoretical

ASJC Scopus subject areas

  • Water Science and Technology
  • Civil and Structural Engineering

Cite this

Simulating sine-generated meandering channel evolution with an analytical model. / Chen, D.; Duan, Guohong.

In: Journal of Hydraulic Research, Vol. 44, No. 3, 2006, p. 363-373.

Research output: Contribution to journalArticle

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