Filling and Emptying System, Cordell Hull Navigation Lock: Cumberland River, Tennessee: Hydraulic Model Investigation Page: 20
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Multiport Arrangements Using 14-in. -diam Ports
45. A multiport arrangement utilizing 14-in.-diam ports also was
tested. The manifold in this arrangement was composed of one row of 89
ports covering approximately 60 percent of the lock chamber length.
Satisfactory performance was not obtained with this arrangement because
of the sensitivity of the relative positions of the ports and the lock
floor. Tests with numerous trench modifications involving width, depth,
and top elevation of the trench wall (i.e. lock chamber floor elevation)
did not reveal a modification which would appreciably decrease the influ-
ence of this factor.
Port Arrangements Using Conventional Sidewall Ports
46. Additional tests were performed to investigate the performance
of port arrangements (types 18-23) in which conventional sidewall ports
discharged into a trench at the toe of the lock walls. For all of these
arrangements, the upstream miter gate pintle was located at sta 0+30; the
farthest upstream and downstream ports were located at sta 1+31 and 3+71,
respectively; and the percentage of lock chamber upstream of the ports,
occupied by the ports, and downstream of the ports was 22.5, 53.3, and
24.2, respectively. Sixteen ports, each 2 ft wide by 3 ft high at the
throat, were spaced on 16-ft centers in each wall. This arrangement
resulted in a port-to-culvert area ratio of 0.96 based on the culvert area
at the valve. The culvert was 10 ft by 10 ft at the valve and 10 ft wide
by 13 ft high at the ports. A 6.5-ft-deep trench with the lock chamber
floor at elevation 428.0 was used in all tests. Observations were made
during filling operations using the base test conditions (62-ft lift and
14-ft submergence) with trench widths of 4 and 8 ft. Sequence photographs
of the lock water surface (photograph 6) taken during tests with a 4-ft-
wide trench (port arrangement type 18) show severe boiling along the lock
walls and strong longitudinal currents in the chamber. These character-
istics were evident in varying degrees with both trench widths.
47. An 8-ft-wide trench was selected for exploratory measurements20
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Oswalt, Noel R. & Boyd, M. B. Filling and Emptying System, Cordell Hull Navigation Lock: Cumberland River, Tennessee: Hydraulic Model Investigation, report, September 1966; Vicksburg, Mississippi. (https://digital.library.unt.edu/ark:/67531/metadc303886/m1/30/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.