FILLING AND EMPTYING SYSTEM FOR ICE HARBOR LOCK SNAKE RIVER, WASHINGTON;Hydraulic Model Investigation

摘要

The Ice Harbor lock, 86 ft wide by 675 ft long, has a split-lateral hydraulic system and a maximum lift of 103 ft. The hydraulic system, lock chamber, outlet basin, and portions of approach channels were reproduced in a 1:25-scale model. Design details of the lateral culverts were studied in a 1:16-scale model. Pressures downstream from the right filling valve and in 90-degree bends of the original emptying culverts were lower and hawser forces on barge tows were higher than desired. Pressures in the right culvert were increased by moving the roof transition upstream to the filling valve. Pressures in the 90-degree bends were satisfactory when expanding sections just upstream from the outlet basin were eliminated and the outlet basin was changed to direct flow downstream. Hawser forces were reduced by redesigning the upstream sill block. The adopted lock chamber and filling system were tested for lifts between 80 and 112 ft. (Modified author abstract)