Modelling of meandering channels for overbank flow

The depth-averaged equation of motion in the stream-wise direction with curvilinear coordinates was considered. Its application to a meandering channel for over-bank flow was investigated using velocity and boundary shear stress. The velocity and boundary shear stress were measured using a laser Doppler anemometer and Preston tube respectively. The advection and bed friction terms in the equation of motion were found to be significant, but the transverse turbulence was found to be insignificant at the apex section. As a result the equation of motion was considerably simplified. The calibrating advection term with the data gave two equations. These gave a good prediction of velocity across the apex section for different scales of meandering channels. The investigation of the advection term with varying scaled flume data suggested that it is important for a small flume, but tends to be less significant in a large flume.