Abstract
Diffusion coefficient of natural sediments and effects of lift force and gradient in particle velocity fluctuations were investigated through using a closed kinetic model. Comparison against experimental data of Einstein & Chien (1955) validated the model. The diffusion coefficient eyy of medium and large sediments distinctly exceeds fluid eddy viscosityv f t , while eyy of fine sediments approximately equalsv f t . In the measured region of0.03<y/H<0.4, e yy/v f t increases with the distance from the wall decreasing. Combined effects of lift force and gradient in particle velocity fluctuations change sediment gravitational settling remarkably belowy/H=0.2, and need to be accounted for describing sediment diffusion in this region.
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