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|Title:||Navigation conditions in Alexandria Reach, Red River Navigation Project, Louisiana : hydraulic model investigation|
|Authors:||United States. Army. Corps of Engineers. New Orleans District.|
Shows, Louis J.
Franco, John J.
Red River Navigation Project
|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-78-24.|
Abstract: Alexandria Reach is a section of the Red River approximately 87.3 miles upstream of the junction of the Red and Mississippi Rivers. The reach is included in the Red River Navigation Project and will be about 14 miles upstream of Lock and Dam No. 2. There are five bridges in the reach within a distance of less than 2 miles . A fixed- bed model reproducing about 3.5 miles of the river in the vicinity of Alexandria, Louisiana, to an undistorted scale of 1:100 was used to determine navigation conditions through the reach and to develop modifications required to eliminate any adverse conditions indicated. The model investigation was concerned principally with navigation conditions approaching and through the bridges. Results of the investigation indicated the following: (1.) With existing conditions, navigation through the reach will tend to be hazardous, particularly for downbound tows because of the arrangement and limited width of the navigation spans, the channel and current alignment approaching the bridges, and the high-velocity currents. (2.) The high-velocity currents with the water-surface elevations anticipated in the reach indicate that some scouring of the channel bed and changes in channel cross section can be expected with the completed project. (3.) Navigation conditions through the reach with the existing bridges can be improved by modification of the revetment along the left bank in the cutoff and just downstream of the cutoff, excavation of the right bank between the two upper bridges, excavation and addition of a dike along the left bank upstream of the U.S. Highway 165 Bridge, and addition of submerged dikes along the right bank. (4.) Navigation conditions in the lower reach would be considerably better with the replacement of the U.S. Highway 165 Bridge. (5.) Navigation through the reach will tend to be hazardous because of the limited widths of spans divided by a center pier, alignment of the channel and bridge spans, and short distance between some of the spans. Satisfactory navigation conditions would require the use of tows with sufficient power and maneuverability to maintain control and alignment and widths of tows limited to 35 ft.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
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|TR-HL-78-24.pdf||9.64 MB||Adobe PDF|