A general analytical model for lateral velocity distributions in vegetated channels

Xiaonan Tang*, M. Sterling, D. W. Knight

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


This paper presents a method for predicting the distribution of depth-averaged velocity in channels with either emergent or submerged vegetation. A general analytical solution to the depthintegrated Reynolds-Averaged Navier-Stokes (RANS) equation is given, where the drag force due to vegetation is modelled as an additional momentum ‘sink’term. The method includes the effects of bed friction, drag force, lateral turbulence and secondary flows, via four coefficients f, CD, λ & Γ respectively. The analytical solution gives good predictions of lateral velocity distribution when compared with two sets of experimental data of vegetated channels with submerged vegetation and two sets of data with emergent vegetation. The lateral distribution of bed shear stress can also be obtained through the Darcy-Weisbach friction factor. The predicted velocity and bed shear stress distributions can provide a basis for modelling flood conveyance and sediment transport in channels with vegetation.
Original languageEnglish
Publication statusPublished - Sept 2010
EventRiver Flow 2010 - Braunschweig, Germany
Duration: 8 Sept 201010 Sept 2010


ConferenceRiver Flow 2010
Internet address


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