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Lock and Dam No. 4 is the fourth lock in a series of five to be constructed on the Red River Waterway from the vicinity of Old River to Shreveport, LA. Lock 4 is located in a cutoff canal on the left descending bank about 169 post project river miles above the mouth of the Red River. The principal structures include an 84- by 785-ft lock, a gated spillway containing five tainter gates, and a hinged crest gate 100 ft wide. The fixed bed model reproduced about 3.5 miles of realigned river channel and adjacent overbank area at an undistorted model scale of 1:100. The model investigation was concerned with determining the effects on navigation through the study reach for the proposed design and developing modifications required to the design that would provide satisfactory navigation conditions.
A movable-bed physical model was used to investigate and solve potential channel development and maintenance problems associated with Lock and Dam No. 4 on the Red River in Louisiana. The model reproduced the Red River from 1967 river mile 213.1 to 204.7 using a distorted scale of 1:120 horizontally and 1:80 vertically. The model was adjusted to reproduce prototype conditions before the inclusion of the proposed project. The upstream approach to Lock and Dam No. 4 will include a short-radius man-made cutoff through the neck of the existing bend, shortening the length of the existing bendway by approximately 1 mile. The lock and dam will also be located in an excavated channel, cutting off about 3 miles of an existing bendway. Procedures were developed to properly model channel modifications that significantly shorten the channel length. Various configurations of dikes and berms were evaluated to determine the optimum configuration for maintaining a satisfactory navigation channel. Hydraulic models, Red River, Navigation channels, River training structures, Navigation locks and dams, Sedimentation.
A two-dimensional numerical model, TABS-2, was used to predict fine sediment deposition in the lock approach channels upstream and downstream from proposed Lock and Dam No. 4 on the Red River Waterway, Louisiana. The numerical model was used to evaluate alternative designs. Fine sediment deposition with the proposed design at Lock and Dam No. 4 was compared to fine sediment deposition at existing locks and dams downstream. Keywords: Locks waterways; Inland waterways; Navigation lock and dams; Numerical models; Red River, Louisiana; Sedimentation; TABS-2 computer program. (edc).
THIS REPORT WAS PREPARED TO PROVIDE INFORMATION TO THOSE WHO MAY INVESTIGATE FUTURE PROBLEMS ON THIS STRUCTURE AND FOR THOSE INVOLVED IN DESIGNING SIMILAR STRUCTURES. THIS REPORT SERVES AS A BASIS FOR THOSE PERFORMING PERIODIC INSPECTIONS.