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An investigation on three-dimensional turbulent structures accompanied with secondary currents and large-scale horizontal vortices in compound open-channel flows is very important in basic hydraulics as well as in river environment engineering to evaluate the friction law of the flow and sediment ransport in compound river. In this study, secondary currents and three-dimensional (3-D) turbulent structures were experimentally revealed by making use of a fiber-optic laser Doppler anemometer (LDA). These experimental data were compared with the numerical calculations using threedimensional algebraic stress model (3-D ASM). Next, instantaneous structures were analyzed by making use of Particle-Image Velocimetry (PIV) which can measure the simultaneous velocity components at all points in laser-light-sheet (LLS). These results revealed effects of the floodplain depth on the turbulent structures in compound open-channel f ows.

Effects of Floodplain Depth on Coherent Vortices in Compound Open-Channel Flows