EXPERIMENTAL STUDY TOWARD THE UNIFIED THEORY OF BED MATERIAL LOAD USING PARTICLE TRACKING METHOD AND PIV ANALYSIS

Abstract

 In this paper, we examine the horizontal and vertical movement velocities and concentration distributions of particles by making full use of particle tracking with a high-speed camera and PIV. As a result, it was found that the horizontal moving velocity had the similar distribution as the conventional theory, but the vertical moving velocity did not match the settling terminal velocity of the particles, and the velocity of upward and downward motion were about the same magnitude. In addition, it was clarified that the concentration of moving particles became one smooth distribution and continuously with the riverbed concentration. Furthermore, by paying attention to the phenomenon on the ripple, we were able to visualize and clarify how the influence of the systematic vortex structure of the water flow appears on the trajectory of the particles.