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The falling motion of particle clouds, produced by direct dumping of particles consisting of fine and coarse component of particles into a body of water with finite depth, and the horizontal motion of the clouds spreading along the bottom, subsequently formed by impingement of the falling clouds on the bottom, are investigated via the particle thermal theory and experimental study. It is demonstrated that such major flow characteristics as the falling velocity, maximum half width and average concentration of the clouds can be predicted by the theory. It is also shown that the horizontal motion of the clouds and the depositional profile of particles are significantly influenced by the existence of coarse component of the particles, which plays an important role to transport fine component of the particles away from a dumping point and hence to cause water contamination in wider area.

THE EFFECTS OF SIZE DISTRIBUTION ON THE MOTION AND DIFFUSION OF PARTICLE CLOUDS