複断面開水路流れに発生する大規模水平組織渦の安定性に関する実験的研究

抄録

In compound open channels, a shear instability generates large horizontal vortices at the junction between the main channel and the flood plains, so that a pair of vortex streets are formed near the both junctions. Stability of horizontal vortices is studied in terms of shear instability and Karman's vortex streets. It was found from the experiment that the interaction between the main channel and the flood plain becomes strong at some intermediate width of the main channel. The vortices are unstable when the width of main channel is comparable with the depth of the main channel.