THE MOTION AND DEPOSITION OF 2D PARTICLE CLOUDS PRODUCED BY DIRECT DUMPING OF NONUNIFORM PARTICLES

Abstract

Motion of suspension clouds propagating along the bottom boundary, resulting from direct dumping of a mixture of fme and coarse particles from the surface of a quiescent water, is investigated. A series of laboratory experiment is conducted by varying inflow condition as well as ambient water depth. It is found that the motion of the suspension clouds can be differentiated into the transition and the gravity current regions. Parameters to adequately describe such flow characteristics as the propagation speed, height, buoyancy etc. of the front of the clouds in each region are quantified. The effects of coarse particles on the spreading of the clouds are also examined.