Abstract
A method of flow-visualization was applied to ellucidate the three-dimensional characteristics of coherent structures near the bed of uniform open-channel flow.
Flow patterns in horizontal cross-sections of the flow were visualized. The pictures were digitized and analysed by computer system. In the results, two-dimensional distribution of some of the hydraulic variables such as velocity, streamlines and velocity correlation coefficients were calculated and displayed as graphical outputs.
These results brought forth an assumption of frozen turbulence along the longitudinal line, which enabled the authors to calculate the upward components of velocity vectors. On the basis of thus-obtained, three-dimensional distribution of velocity vectors, coherent structure of the flow near the channel bed was ellucidated.
