Aberdeen Lock and Dam will be the fourth structure proposed for the development of navigation on the Tennessee-Tombigbee Waterway. The lock and dam will be located in a bypass canal about 407.98 miles above the mouth of the Mobile River, or about 1 mile east of Aberdeen in Monroe County, Mississippi. The structures are designed to maintain a minimum upper pool during low flows extending 18 miles up the Tombigbee River and about 1.5 miles up Town Creek and into the Canal Section. The structures will include one lock with clear chamber dimensions of 110 by 600 ft and a dam with a 6-gated spillway section located in a bypass canal on the left overbank. A fixed-bed model reproduced about 1.0 mile of the Tombigbee River channel, the lock approach canal, and the adjacent overbank areas to an undistorted scale of 1:120. The model investigation was concerned with the development of satisfactory navigation conditions in the lock approaches, the distribution of flow through the gated spillways, and the effects on stages of the cofferdam, landfills, and relocation of the railroad. Results of the investigation revealed that satisfactory navigation conditions would require modi fication of the excavation in the upper approach to the lock and dam, a dike forming an extension of the upper guard wall, and a short wing dike near the downstream end of the riverward lock wall. Distribution of flow through the gated spillway, particularly in the two gate bays near the lock, would be adversely affected by the alignment of currents approaching the structure, but the drop in water-surface elevation through the spillway and along the lock and lock walls would not be excessive. Construction of the cofferdam for the lock and dam would have little effect on water-surface elevations and velocities in the area, but the cofferdam and landfills could cause an increase in stages of as much as 1.7 to 2 .0 ft with the higher flows. Relocation of the north-south section of the railroad would have little effect on water-surface elevations with adequate openings provided in the embankments.


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    Titel :

    Navigation Conditions at Aberdeen Lock and Dam, Tombigbee River, Mississippi and Alabama: Hydraulic Model Investigation



    Erschienen in:

    Erscheinungsdatum :

    1978


    Format / Umfang :

    7533956


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


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