Estimation of flow direction in meandering compound channels

摘要

Highlights?The depth-averaged two-dimensional flow direction between the entrance and apex sections is predicted.?The vertical profile of local flow angles is linked to the secondary current cell.?The means of the local flow angles within and above the secondary current cell are separately discussed.?The proposed model is verified using published data from five sources.AbstractThe flow in the main channel of a meandering compound channel does not occur in the ridge direction because of the effect of the upstream floodplain flows. This study proposes a model for estimating the flow direction in the depth-averaged two-dimensional domain (depth-averaged flow angles) between the entrance and the apex sections. Detailed velocity measurements were performed in the region between the meander entrance section and apex section in a large-scale meandering compound channel. The vertical size of the secondary current cell is