Experimental investigation of sediment particle longitudinal spinning motion during saltation near the channel bed

In this paper, spinning rate of sediment particle during saltation in turbulent flow was measured by means of high speed photography technique. Experiments have been carried out for different hydraulic conditions, particle sizes and densities. Particle spin was measured in five stage of saltation step by analyzing and processing picture taken at 250 frame per seconds. The results showed that increasing turbulence parameter of flow will cause increase in angular velocity and under the same flow condition, particles with larger sizes and specific gravities spin more rapidly.