Abstract
In order to enhance the physical understanding of the turbulent structures, the streamwise evolution of the turbulent flow in narrow open channel over a fixed continuous rough bed has been investigated experimentally. The experiments were conducted to investigate the effects of Reynolds number and aspect ratio on turbulence characteristics in developing and fully developed narrow open channel flows. Instantaneous 3-D velocities were acquired using a Nortek VectrinoPlus down looking acoustic Doppler velocimeter at streamwise intervals of 0.5 m along the centerline of the flume. The time mean velocities with inner scaling for different aspect ratio flows demonstrate the self-similarity of fully developed flow. The effects of Reynolds number and aspect ratio on the normalized turbulence intensities, Reynolds shear stress and turbulent kinetic energy were found significant in the outer region of both the developing and fully developed narrow open channel flow.
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