Abstract
It is very important in River Engineering and Hydraulic Engineering to investigate the effects of side-bank angle q between the main channel and flood plain on velocity profiles and secondary currents in compound open-channel flows. In the present study, very accurate turbulence measurements were conducted with a new twocomponent fiber-optic laser Doppler anemometer (FLDA). Because the measuring points were about 500, accurate contour lines of velocity and vector plot of secondary currents could be obtained and analyzed in detail. Of particular significance is the shift of velocity-dip phenomenatowards the main channel as the flood-plain angle decreases.
