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Sand capping is a technique to improve polluted sediment. Widely used methods of sand capping are throwing sand into water directly from work ship or pouring in sand through a Toremie pipe. Although these methods are considered handy to operate, there are three points to be improved: (1) turbidity, (2) irregularity of sand layer thickness, and (3) work efficiency. To improve these points, we have developed a new equipment of sand capping. After sand slurry is injected to the equipment, the velocity of sand particles decreases since the cross-section of the equipment gradually expands. When the sand particles fall, the horizontal and vertical velocities are nearly zero, so that turbidity is restrained. And all the opening mouth of the equipment where sand particles go out is covered with a sparse mesh. The mesh separates the current in the equipment from the outside, but it doesn’t disturb the motion of water mass. It is confirmed through the experimental tests that this new equipment achieves nearly regular thin sand layer.

DEVELOPMENT OF A LOW-TURBIDITY SAND CAPPING METHOD BY CIRCULATORY SULURRY FEEDER