It is very important in river management and hydraulic engineering to investigate the hydrodynamic properties in vegetated open-channel flows. There are a lot of experimental and numerical studies on open-channel flows over vegetated canopies, in which velocity distributions are largely varied with not only vertical but also streamwise and spanwise diretions. In particular, it is needed to reveal such dispersive properties of velocity components, because it is considered that the velocity dispersion has significant relations with turbulence transport and generation due to vegetations.
Therefore, in this study, turbulence measurements were conducted in vegetated canopy open-channel flows by using two-component laser Doppler anemometer, and turbulence structure and dispersive effects were revealed experimentally.