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Title: Melvin Price Locks and Dam Auxiliary Lock and Rotary Lock Culvert Valve, Mississippi River, Alton, Illinois : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. St. Louis District.
Davis, W. Glenn.
Davidson, Robert A.
Keywords: Hydraulic models
Hydraulic structures
Melvin Price Locks and Dam
Mississippi River
Rotary valve
Lock and Dam No. 26
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-91-5.
Description: Technical Report
Abstract: Tests were conducted on a 1:30-scale model of the Melvin Price Auxiliary Lock, Alton, IL, and on a 1:12-scale model of the rotary valve proposed for use as the filling and emptying valves. The lock model was built to study the effect of the rotary valves on the filling and emptying characteristics, the adequacy of the vertical slide gates to be used as a backup system, and the effects of flow through the adjacent spillway bays on the lock discharge outlets during emptying operations. The filling and emptying system consisted of intake manifolds upstream from the upper miter gate sill, longitudinal culverts, rotary valves, sidewall ports, and discharge outlets in the valve monolith. Unsatisfactory flow conditions were observed during spillway discharges in the vicinity of the lock discharge outlet caused by a discontinuity along the lock wall between the spillway pier and the discharge outlet. A wall was installed that streamlined the discontinuity and provided satisfactory flow conditions during spillway releases. A difference in water-surface elevations was observed between the lock discharge outlets with spillway discharges. This differential caused a transverse flow of water through the lock chamber and resulted in increased hawser forces and an adverse head on the downstream miter gate at the end of an emptying operation. A modified valve schedule was developed to eliminate the crossflow of water through the lock chamber and the adverse head on the downstream miter gate; however, this resulted in slightly longer emptying times. Tests with the type 3 design filling and emptying system (with rotary valves) when compared to a similar conventional system using reverse tainter valves indicated significantly longer emptying times and slightly longer filling times. The rotary valve model was built to study the hydraulic forces acting on the valve and pressure fluctuations on and around the valve and to observe conditions in the vicinity of the valve during steady-state and dynamic operating conditions. The maximum pressure difference across the gate occurred when the valve reached between a 50 and 60 percent open position during an emptying operation. The maximum torque on the valve occurred when the valve reached a 50 percent open position.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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