A two-layer approach for depth-limited open-channel flows with submerged vegetation

Wonjun Yang, Sung Uk Choi

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

A two-layer approach for depth-limited open-channel flow with submerged vegetation is described. A momentum balance is applied to each layer and expressions for the mean velocities are proposed. The velocity is assumed to be uniform in the vegetation layer and logarithmic in the upper layer. The proposed relationship successfully predicts the mean velocity distribution when compared with the measured data. Using the velocity formula, the layer-averaged mean velocities in the upper layer and over the entire layer are derived. An expression for the roughness coefficient increased by vegetation is also presented, performing better for the roughness coefficient than other formulas. Another relationship is proposed for predicting the distribution of suspended sediment in depth-limited flow with submerged vegetation by using an eddy-viscosity profile. The predicted profiles moderately agree with the measured data. Comparisons with simulated data from the Reynolds-averaged Navier-Stokes equations with the k-ε model suggest that these proposals successfully predict suspended sediment transport in a depth-limited flow with submerged vegetation.

Original languageEnglish
Pages (from-to)466-475
Number of pages10
JournalJournal of Hydraulic Research
Volume48
Issue number4
DOIs
Publication statusPublished - 2010 Aug 1

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submerged vegetation
Open channel flow
open channel flow
Suspended sediments
Surface roughness
suspended sediment
roughness
Sediment transport
Velocity distribution
Navier Stokes equations
Momentum
vegetation
Navier-Stokes equations
Viscosity
sediment transport
momentum
eddy
viscosity

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology

Cite this

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abstract = "A two-layer approach for depth-limited open-channel flow with submerged vegetation is described. A momentum balance is applied to each layer and expressions for the mean velocities are proposed. The velocity is assumed to be uniform in the vegetation layer and logarithmic in the upper layer. The proposed relationship successfully predicts the mean velocity distribution when compared with the measured data. Using the velocity formula, the layer-averaged mean velocities in the upper layer and over the entire layer are derived. An expression for the roughness coefficient increased by vegetation is also presented, performing better for the roughness coefficient than other formulas. Another relationship is proposed for predicting the distribution of suspended sediment in depth-limited flow with submerged vegetation by using an eddy-viscosity profile. The predicted profiles moderately agree with the measured data. Comparisons with simulated data from the Reynolds-averaged Navier-Stokes equations with the k-ε model suggest that these proposals successfully predict suspended sediment transport in a depth-limited flow with submerged vegetation.",
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A two-layer approach for depth-limited open-channel flows with submerged vegetation. / Yang, Wonjun; Choi, Sung Uk.

In: Journal of Hydraulic Research, Vol. 48, No. 4, 01.08.2010, p. 466-475.

Research output: Contribution to journalArticle

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