Author(s): Iehisa Nezu; Taka-Aki Okamoto
Linked Author(s): Iehisa Nezu
Keywords: Turbulence structure; Organized motion; Flexible vegetation; Monamiphenomen
Abstract: It is necessary in river environment and hydraulic engineering to investigate the hydrodynamic properties in vegetated open-channel flows. It is often observed that the downstream advection of the Kelvin-Helmholtz vortices generates the coherent waving motion of plants, which is called the “Monami'' phenomena in aquatic canopy flow. These “Monami'' motions dominate the vertical momentum transport and scalar transport into the aquatic canopies. Therefore, in the present study, the instantaneous measurements of water velocity and vegetation motion were conducted successfully by PIV & PTV. As the results, we revealed the relation between the turbulence structure and the occurrence of Monami phenomena.
Year: 2009