2024 Volume 80 Issue 16 Article ID: 23-16080
The present study aims to elucidate the basis of momentum transport in partially vegetated open-channel flows by laboratory experiments. For four cases with different vegetation patch widths, PIV measurements were performed to investigate effects of the patch width on the vertical and horizontal vortex structures. Results demonstrate that large-scale horizontal vortex and secondary flow in a non-vegetated region are developed most remarkably in moderately wide vegetation flow. In addition, repeated measurements by shifting the vertical and spanwise measurement positions enabled us to reveal the secondary flow structure and the dominance of vertical vortex in momentum transport around the lateral edge of a vegetation patch.
