Navigation Lock, The Dalles Dam, Columbia River, Oregon and Washington: Hydraulic Model Investigations.
ARMY ENGINEER DIV NORTH PACIFIC BONNEVILLE OREG DIV OF HYDRAULIC LAB
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Tests were conducted on a 125-scale model of the 86-ft-wide by 675-ft-long navigation lock chamber, hydraulic system, and approaches. Minimum, average, and maximum lifts for the lock are 62.8, 83.6, and 90.5 ft, respectively. Model tests on elements of the original design lock showed that improvements were needed. Vortex action extended through the intake and filling culverts and created an explosive discharge within the lock chamber. With an initial head of 90.5 ft, the lock filling time was 12.0 min, emptying time was 15.8 min, and maximum forces on barge tows moored within the lock chamber were 15.7 tons. The maximum forces, which occurred about 1 min after the filling valves began to open, indicated that the initial phase of valve motion was too rapid. Strong eddy action and maximum velocities greater than 10 fps showed that improved distribution of lock outflow into the downstream approach was required.
- Civil Engineering