SAND DISCHARGING APPARATUS AND SAND DISCHARGING METHOD

PROBLEM TO BE SOLVED: To propose a sand discharging apparatus which can discharge huge amounts of gravel and sediment heaped up in a dam reservoir or in a gulf efficiently and in a short time, and to provide a sand discharging method. SOLUTION: In operation of the sand discharging apparatus, a suction pipe (1) is placed in the vicinity of a gravel surface (G) heaped up on an aqueous bottom, and then suction of the gravel (S) and discharge of the same are carried out. The sand discharging apparatus is comprised of a pipe flow velocity operating means (2) for arithmetically operating a pipe flow velocity (V0) of the suction pipe (1), and an inlet port flow velocity operating means (3) for arithmetically operating a flow velocity at a suction port (1c) of the suction pipe (1). COPYRIGHT: (C)2006,JPO&NCIPI