METHOD FOR DEEP RIVER AND CANAL CLEANING OF SEDIMENTS Russian patent published in 2008 - IPC E02B3/02 

FIELD: stream regulation, for example, breaking up subaqueous rock, cleaning beds of waterways, directing water flow.

SUBSTANCE: cleaning method involves repeatedly moving floating vehicles provided with helical-blade devices along river or canal bed in upstream and downstream directions; stirring-up bottom sediments with helical-blade devices and removing the stirred-up sediments with water stream. To provide floating vehicle movement in dependence of river or canal depth and floating vehicle movement direction spatial helical-screw device positions are determined. In downstream floating vehicle movement plane of helical-blade devices is parallel to bottom. In upstream floating vehicle movement plane of helical-blade devices is at acute angle to bottom. Number of floating vehicle trips is determined from total length of river or canal section to be cleaned with the use of the following formula: n=L/L_i=(L·u_i)/(v·h_i), where L is total length of river or canal section to be cleaned; v is water stream velocity; u_i is hydraulic particle size of sediment fraction to be removed; h_i is sediment fraction particle stirring-up height, which depends on particle diameters, i.e. h=(0.7÷0.8)H for particles having dimensions d=0.005 mm, h=(0.3÷0.8)H for d=2 mm and h=(0.1÷0.3)H for d>10 mm, here H is water stream depth; L_i is river or canal section length, L_i=(v/u_i)·h_i. Helical-blade devices are installed in pairs and rotated in opposite direction.

EFFECT: increased degree of water stream energy usage for river or canal bed cleaning of sediments and decreased cleaning costs, as well as increased efficiency and reliability of deep river and canal cleaning of sediments.

2 cl, 4 dwg