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Title: Prototype evaluation of Bay Springs Lock Tennessee-Tombigbee Waterway, Mississippi : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Mobile District.
McGee, Richard G.
Keywords: Bay Springs Lock
Hydraulic structures
Prototype tests
Locks (waterways)
Venting (air demand)
Bay Springs, Mississippi
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-89-15.
Description: Technical Report
Abstract: Prototype tests were conducted to comprehensively evaluate the performance of the 84-ft lift Bay Springs Lock, located at the southern end of the Divide Section of the Tennessee-Tombigbee Waterway. The evaluation included analysis of the operating characteristics and hydraulic efficiency of the lock as well as a comparison of the physical and analytical model results with the prototype. Prototype measurements included pressures in the culvert system, air vent flow rates, downstream approach canal surges, valve movement and cylinder pressures, and water-surface elevations. Results indicate that satisfactory operating conditions exist at Bay Springs Lock. The lock has functioned without major operational problems and the prototype test data do not indicate any area in which major operational problems might be expected. Air venting just downstream of all valves is required to eliminate large-scale cavitation. Small cavitation occurs following the vented periods; however, the time duration is so short that the design is acceptable. The 6-in. orifices installed on the filling valve air intakes for controlling air entrainment seemed to be the optimum size. Venting without the intake orifice installed (12-in.-diam opening) resulted in unacceptable chamber water surface conditions due to the large amount of air entrained in the flow. Without venting, severe cavitation occurred. A 4-ft surge was generated in the downstream canal during normal emptying operations. Comparison of the prototype with the previous physical model s tudies and an analytical model showed reasonable agreement between predicted conditions and actual conditions. As expected, the physical model was less efficient than the prototype. Predictions of critical culvert pressures (below the valves) were higher than those measured in the prototype. The analytical model, when calibrated with operation time, more closely predicted these critical pressures. Prototype values for surge height were higher than the results for both the physical and analytical models.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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