Abstract
It has been known that shear instability generates large horizontal vortices at the junctions of main channel and flood plains for two-stage channels. In the present laboratory tests, it was found that the vortices disappear due to subdepth scale turbulence for flows with relatively large value of h/H. For channels with bank vegetation, horizontalp eriodicv orticesa lsoa ppear, for which it was seen that the vorticesi n the main channeli s predominant.Numericalc omputations were performed by employing SDS-2DHt urbulencem odel, the results o f which agree reasonablyw ell with the experiments.
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