TOWARDS THE MODELLING OF THE HYDRODYNAMIC FORCES IN COMPOUND OPEN CHANNEL WITH VEGETATED FLOOD PLAIN

Abstract

Steps towards the prediction of the hydrodynamic forces in the compound open channel with vegetated flood plain are described. An algebraic stress turbulence model is offered with options for open surface proximity and for the presence of vegetation. The efficiencies of the production of turbulence energy and dissipation by the vegetation are discussed. Results for the secondary currents and streamwise velocity are shown for dilute vegetation and for dense vegetation at the flood plain.