Accession Number : AD0760940

Title :   Emergency Gate, Greenup Locks Ohio River, Kentucky: Hydraulic Model Investigation.

Descriptive Note : Technical rept. Nov 54-Jul 56,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Melsheimer,E. S. ; Cowan,N. V.

Report Date : OCT 1959

Pagination or Media Count : 49

Abstract : Tests were conducted on a 1:25-scale model of the emergency lift gate proposed for use in the locks at Greenup Dam. Model tests were made to determine the vertical hydrodynamic forces acting on the downstream leaf of the gate as its crest is raised through flowing water from elevation 497 (sill elevation) to above the upper pool elevation 515. The tests revealed that the gate as originally designed was unsatisfactory and would bounce (vertical displacement) violently during certain tailwater conditions. The instability of the gate was attributed primarily to negative pressures on the curved gate crest and to the back roller from the outflow nappe which tended to force the gate upward. At low tailwater conditions (elevation 484), venting of the gate crest eliminated the bouncing; however, at tailwater elevations between 499 and 508, the vent system was drowned and the gate bounced violently. As no curved-surface gate crest would ideally fit all flow conditions, tests of a plane-surface gate crest were undertaken.

Descriptors :   (*DAMS, *HYDRAULIC MODELS), INLAND WATERWAYS, STRUCTURES, TEST METHODS, FORCE(MECHANICS), HYDRODYNAMICS, STABILITY

Subject Categories : Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE