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Title: DANS model for vegetated open channel flows
Authors: Li, CW 
Li, JJ
Keywords: DANS model
Numerical model
Open channel flow
Turbulence closure
Vegetated flow
Issue Date: 2015
Publisher: Taylor & Francis published on behalf of the International Association for Hydro-Environment Engineering and Research
Source: Journal of hydraulic research, 2015, v. 53, no. 6, p. 699-713 How to cite?
Journal: Journal of hydraulic research 
Abstract: A novel Double Averaged Navier-Stokes equation model has been developed to simulate flows in vegetated open channels. Turbulence is modelled by the Spalart-Allmaras closure with a modified length scale, which is dependent on a zero-plane displacement parameter relating to the vegetation characteristics. The dispersive stress is modelled by a sub-length scale closure and the secondary current effect is modelled by a phenomenological expression. The simulation results show that the model is accurate for flows over vegetation with areal density ranging from 170 m(-2) to 12,000 m(-2). The computed dispersive stress and velocity dip are in reasonable agreement with the available experimental data. The effects of porosity and dispersive stress on the mean velocity and Reynolds stress are found to be minor. The model works well for gradually-varied flow over vegetation and predicts accurately the Manning roughness coefficient for flows over vegetation with low to high areal density.
ISSN: 0022-1686
EISSN: 1814-2079
DOI: 10.1080/00221686.2015.1054320
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