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The effect of recently constructed and proposed channel improvements on sedimentation in the Red River downstream from Lock and Dam NO. 1 were investigated. A one-dimensional numerical model (HEC-6) was used to evaluate the effect of contraction works on dredging requirements in the navigation channel. A two-dimensional numerical model (TABS-2) was used to evaluate proposals to reduce deposition in the downstream lock approach channel at Lock and Dam No. 1. Recommendations were made to reduce sediment problems in the study reach. (FR).
Tests were conducted on a 1:50-scale model of John H. Overton and Dam, Alexandria, LA, to develop a satisfactory spillway, stilling basin, and riprap plan for the proposed project. Tests were conducted with and without a proposed hydropower plan. The recommended stilling basin and riprap designs provided a stable conditions for single gate operation with normal upper pool and minimum tailwater. Tests were conducted with four- and three-unit powerhouse having various approach and exit configurations. During construction of John H. Overton Lock and Dam, sediment deposition problems occurred in the lower lock approach of Red River Lock and Dam No. 1. Additional sedimentation studies were conducted to ensure that these problems would not occur at John H. Overton. Dikes placed in the downstream channel were proposed as a solution to the sedimentation problem. The stability of the riprap forming these dikes and the impact of the dikes on the water-surface profiles were also studied in this investigation. (jhd).