3D Numerical modelling of flow divisions at open channel junctions with or without vegetation

Chi Wai Li, C. Zeng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

The flow division at an open channel junction is affected by the inflow discharge and the downstream water depths of the junction. The growth of vegetation in a channel system is environmental friendly, but its effect on the flow in an open channel junction can be significant. In this work a 3D RANS (Reynolds Averaged Navier-Stokes equation) model has been implemented to investigate the flow phenomena in channel junctions with or without vegetation. The model is first validated by two cases: flow in an open channel T-junction without vegetation, and flow in a single open channel with vegetation. The model is then applied to simulate flow in an open channel T-junction with varying width ratio and vegetation density of the branch channel. The results quantitatively predict the trend of increasing flow in the branch channel with the increase in branch channel width and/or the decrease in vegetation density. The overall energy loss coefficient of the system, however, decreases with the amount of flow in the branch channel.
Original languageEnglish
Pages (from-to)49-60
Number of pages12
JournalAdvances in Water Resources
Volume32
Issue number1
DOIs
Publication statusPublished - 1 Jan 2009

Keywords

  • 3D flow model
  • Flow diversion
  • Open channel
  • Vegetation

ASJC Scopus subject areas

  • Water Science and Technology

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