Please use this identifier to cite or link to this item:
|Title:||Filling and emptying system for Bay Springs Lock, Tennessee-Tombigbee Waterway, Mississippi : hydraulic model investigation|
|Authors:||United States. Army. Corps of Engineers. Nashville District.|
Ables, Jackson H.
U.S. Army Engineer Waterways Experiment Station
Hydraulics Laboratory (U.S.)
|Keywords:||Bay Springs Canal (Miss.)|
Bay Springs Lock (Miss.)
Locks (Hydraulic structures)
Tennessee-Tombigbee Waterway (Ala. and Miss.)
|Publisher:||Hydraulics Laboratory (U.S.)|
U.S. Army Engineer Waterways Experiment Station.
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-78-19.|
Abstract: The hydraulic model investigation reported herein was concerned with planning and design of a single lift, 110-by 600-ft lock (pintle to pintle), at the southern end of the Divide Section of the Tennessee-Tombigbee Waterway. Normally, an 84-ft lift condition will obtain, but a maximum of 92 ft or a minimum of 78 ft is possible at the site. A 1:25-scale model was built to study the filling and emptying system. The system proposed by the Nashville District and developed in the model test was of the longitudinal floor culvert type. Culverts in each lock wall are connected to a crossover culvert with a horizontal splitter wall dividing flow to upstream and downstream tuning forks where equal division leads into the two longitudinal floor culverts in each end of the chamber, near the chamber quarter point. With the type 17 (recommended) design, the model gave filling and emptying times of 10.5 min and 13.3 min, respectively, with a 1-min filling valve and a 2-min emptying valve. The prototype can be expected to fill and empty about 18 percent faster (8 6 min and 10.9 min, respectively). Flow conditions in the lock chamber during filling were excellent with a very small degree of turbulence. Unmoored half tows in the lock chamber either rose vertically or drif ted toward the center of the lock, and full tows drifted very slowly toward the lower miter gate during the latter part of the filling operation. Unmoored tows shoul d never be permitted in locks, but this performance indicates built-in safety for this longitudinal floor culvert system. The system developed is particularly desirable for high lift locks in that it is insensitive to misoperation; that is, dangerous surges in the lock chamber cannot be created by fast operation of the valves, nonsynchronous operation of the valves, or intermittent stopping of the valves during the opening cycle. NOTE: This file is large. Allow your browser several minutes to download the file.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
Files in This Item:
|TR-HL-78-19.pdf||12.7 MB||Adobe PDF|