The proposed New Ship Lock for the Mississippi River-Gulf Outlet, Louisiana, will be 150 ft wide by 1290 ft long (pintle to pintle) and will have lifts varying from 1.0 to 18.4 ft as well as reverse heads up to 3.0 ft. Two sets of miter gates are planned to care for reverse heads. Since the proposed lock is some 40 ft wider than any locks previously designed in the United States and will be used by both ship and barge traffic and will be subjected to reverse head conditions, a Hydraulic Model Investigation of the filling and emptying system was required. Results of tests of the hydraulic system for the proposed lock in a 1:25-scale model are presented in this report. The original intake and outlet designs which must perform as both intakes and outlets were investigated and found to be satisfactory. Tests of 20 sidewall port manifold arrangements resulted in the recommendation of the type 15 sidewall port manifold arrangement. This arrangement consisted of 20 original design ports (throats 5 by 3.25 ft), spaced 38 ft on centers in each 18.5 by 18.5-ft wall culvert with the ports staggered in opposite walls. There was 22.79 percent of chamber upstream of the manifold, 57.44 percent of the chamber with manifold, and 19.77 percent of the chamber downstream of the manifold. Port-to-culvert area ratio was 0.95. Triangular floor recesses 15 by 15 by 3 ft deep were installed at the 7 upstream ports in each wall and rectangular floor recesses 15 by 15 by 3 ft deep were installed in the 13 downstream ports. The floor of the culvert, sidewall port manifold, and floor recesses were at a common invert elevation with the lock chamber floor 3 ft higher. In order for the lock to perform satisfactorily for deep-draft ships, it will be necessary to construct the chamber floor at a lower invert elevation than for barge tows. Sufficient ship model input data were presented to permit necessary economic analysis to determine the feasibility of the type 15 (recommended) design manifold port system as developed with some lowering of the chamber floor and manifolds between the miter gates. This input together with projected traffic requirements, head and stage duration studies, and other pertinent considerations will be used in the economic analysis and sidewall port system evaluation. The type 15 (recommended) design sidewall port system as developed is considered optimum for barge tows and will be satisfactory for ships with the proper clearance provided between the bottom of the ships and floor of the lock chamber. For the culvert size and sidewall port system selected, the optimum elements were developed from model tests.


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    Titel :

    Filling and Emptying System, New Ship Lock, Mississippi River-Gulf Outlet, Louisiana: Hydraulic Model Investigation



    Erschienen in:

    Erscheinungsdatum :

    1978


    Format / Umfang :

    3556749


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :



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