On Measurements of Particle Spinning Motionby Hong-Yuan Lee, (M.ASCE), Natl Taiwan Univ, Taipei, Taiwan,
In-Song Hsu, Natl Taiwan Univ, Taipei, Taiwan,
Abstract: Investigation of particle saltation motion is crucial to the development of the theory of bed load transport. Due to the combination effects of the bed roughness and the velocity gradient, particle spins during saltation process. This spinning motion will generate additional lift force and thus increase the saltation length and height. The increments can be as much as 12%. A high speed photographic technique is developed in this study to measure the saltation trajectories and corresponding velocities and spinning rates. Two kinds of materials, natural sand and plastic balls were used in the experiments. The longitudinal variations of the saltation velocities and the spinning rates were recorded. Statistical analyses were performed to investigate the probability density function of the spinning rates.
Subject Headings: Salts | Particle velocity | Sediment transport | Probability | Particles | Bed loads | Hydraulic roughness
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