Abstract
The inner layer and the outer layer of the unsteady smooth open channel flow were measured accurately with a two-component laser Doppler anemometer. Friction velocities evaluated from both the linear formula in the viscous sublayer and the log-law are good agreement with each other. Mean stream velocity profile and the turbulent intensity distributions can be expressed well by using of van Driest's damping function. Van Driest damping factor decreases in the rising stage and increases in the falling stage. An integral constant of the log-law changes complexity.
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