SPACE- TIME CORRELATION PROPERTIES IN MEANDERING COMPOUND OPEN-CHANNEL FLOW BY USING MULTI-LAYER SCANNING PIV

It is necessary to investigate coherent turbulence structure in meandering compound open-channel flows for predicting the transport and distribution of suspended sediment in actual rivers. However, in previous studies, flow-visualization techniques such as PIV and PTV, have not been applied sufficiently, and thus, there is almost no detailed information of coherent turbulence in meandering compound open-channel flows.Therefore, in this study, we conducted innovative flow-visualization measurements by using a multi-layer scanning PIV system, and could analyze instantaneous velocity vectors on horizontal planes at several different elevations simultaneously.As the results, the correlation properties between the different elevations were revealed in the meandering compound open-channel flow.