The objective of this paper is to examine the behavior of particle movement due to near-bed turbulence over the rough bed surface in an open channel flow. The fluid velocity components with fluctuations are measured by 3D Micro-acoustic Doppler velocimeter (ADV) and subsequently, under given flow conditions images of released moving particles are recorded using a High-Speed Motion-Scope (HSMS) at the Fluvial Mechanics Laboratory of the Indian Statistical Institute, Calcutta. The recorded images are analyzed in the light of particle motions, trajectories, saltation heights and lengths of individual particles, angles of orientation and their interactions with the boundary using a digital image processing technique. The statistical distributions of the physical parameters of turbulence and particle motion have been discussed. The particle motion analysis at the near-bed turbulence using the image processing technique is a new emerging tool to the sediment sorting process.
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