Abstract
In compound open-channel flows, horizontal vortices are generated near the junction due to high shear layer of primary flow when the flood-plain depth is shallower. In this study, simultaneous velocity components were obtained at all grid points of arbitrary section by using the PTV. This PTV is very suitable to measure the shallow flows such as compound open-channel flows with shallow flood-plains. The aim of this paper is to analyze and clarify the instanteneous and space-dine interaction mechanism between the flood-plain and main-channel due to horizontal vortices.
