Abstract
Vegetation such as trees and shrubs are often observed at the floodplain edge in natural rivers. Spanwise profiles of streamwise velocity component are influenced significantly by the drag force of trees. It is thus very important to investigate these hydrodynamic properties and turbulence structure considering the emergent vegetation effects in river engineering and eco hydraulics. So, in the present study, turbulence measurements by 3-D acoustic Doppler anemometer (ADV) were conducted in wide laboratory flume, in which several cylinders are placed as tree models. It is, furthermore, 3-D LES was conducted to simulate concentration transport properties in these complex flows and it is found that there is a maxim exchange rate of concentration between the main-channel and floodplains.
