Author(s): Chang Liu; Tadaharu Ishikawa
Linked Author(s): Chang Liu
Keywords: River channel; Lateral shift; One dimensional model; Secondary circulation
Abstract: The phase lag of a stream meandering to channel curvature generates a lateral shift in the main stream toward the bank, deforming the river channel. This paper presents a new one-dimensional (1-D) analysis method for calculating the lateral shift of the main stream in an arbitrary curved channel. The model includes the effect of secondary circulation on transverse momentum transport from an existing 1-D analysis method based on two-dimensional (2-D) shallow water equations. The new model, which is a quasi-three-dimensional (3-D) 1-D model, was first tested for laminar flow in a single-bend channel and a meandering channel, and then applied to a turbulent flow in 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.