A quasi two-dimensional model for calculating depth-averaged velocity and boundary shear stress in meandering channels for overbank flow is developed for a complex cross-section. The model numerically solves the depth-averaged equation for the streamwise motion of flow in a curvilinear coordinate system. The input model coefficients - friction factor, eddy viscosity and advection term - are calculated from the experimental data obtained from the UK Flood Channel Facility. The predictive ability of the model is assessed against experimental data and results from two and three dimensional numerical models with regard to distributions of depth-averaged velocity and boundary shear stress. The results show that the quasi two-dimensional model produces a reasonable simulation of the flow field when appropriate input coefficients are used.
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