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|Title:||Navigation conditions at Columbus Lock and Dam, Tombigbee River, Mississippi and Alabama : hydraulic model investigation|
|Authors:||United States. Army. Corps of Engineers. South Atlantic Division.|
Franco, John J.
Shows, Louis J.
|Keywords:||Columbus Lock and Dam|
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-77-11.|
Abstract: The Columbus Lock and Dam will be the third navigation structure proposed as part of the development of the Tennessee-Tombigbee Waterway for navigation. The structure will be located in a bypass canal about 370 miles above the mouth of the Mobile River at the foot of Government Street in Mobile, Alabama, or just downstream from the confluence of the Tombigbee and Tibbee Rivers and about 4 miles northwest of Columbus in Lowndes County, Mississippi. The structure is designed to maintain a minimum upper pool during low flows extending upstream to the proposed Aberdeen Lock and Dam at mile 408 and will include one lock with clear chamber dimensions of 110 by 600 ft, a five- gate spillway section of the dam located in the bypass canal on the left overbank, and a fixed overflow section along the left overbank to high ground. A fixed-bed model reproducing about 4.5 miles of the Tombigbee River channel, upper and lower lock approaches, the lock approach canal, and the adjacent overbank areas to an undistorted scale of 1:120 was used to determine the adequacy of the proposed plan and to develop modifications required to eliminate any adverse conditions indicated. The model investigation was concerned principally with navigation conditions into and within the lock approach canal and in the lock approaches and the distribution of flow through the gated section of the dam. Results of the investigation revealed that navigation conditions in the upper approach with the original plan would be difficult and hazardous during the higher flows but that satisfactory conditions could be developed by modifications within the upper lock approach and the construction of properly designed dikes along the approach canal to eliminate or reduce crosscurrents. Even with the modifications developed, two-way navigation in the upper approach to the lock could be difficult and hazardous during high flows and with a flood on the Tibbee River and little or no flow in the Tombigbee River. No navigation difficulties were indicated in the lower lock approach with any of the plans tested. Distribution of flow through the gated spillway was affected by the offset between the lock and right abutment of the dam but could be improved by placing a fillet between the two structures. Satisfactory navigation conditions into and out of the lower reach of the Tibbee River could be developed for limited size tows but conditions would tend to be difficult and hazardous during the higher flows.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
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