Abstract
The phase lag of a stream meandering to channel curvature generates a lateral shift in the main stream toward the bank and deforms the river channel. This paper presents a new 1-D analysis method for calculating the lateral shift of the main stream in arbitrary curved channels. The model includes the effect of secondary circulation on transverse momentum transport differently from an existing 1-D analysis method based on shallow water equations. The new model, which is a quasi-3-D 1-D model, was first tested for laminar flow in a single-bend channel and a meandering channel, and then applied to turbulent flow in sharp and mild single-bend channels and a meandering channel. Comparison with flume experimental data showed that the new analysis method reproduced the longitudinal variation in the stream shift very well, both in laminar and turbulent flows.
