Selective Withdrawal Riser for Sutton Dam, West Virginia. Hydraulic Model Investigation.
Final rept. 12 Aug 77-20 Oct 78,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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A 120-scale physical model was used to determine the hydraulic adequacy of the proposed design including discharge characteristics, pressure conditions, and essential operational guidance. The model reproduced a 16-ft-radius semicircular riser with trashrack, a 120-ft-wide section of Sutton Dam, the entire length of one sluice including its bell-mouthed intake, the intake gate and the flip bucket downstream of the sluice. With the initial riser tested in this model the top of the riser was set at el 910 and the invert at el 810. Very unstable flow conditions were observed for all discharges greater than 800 cfs. Vortices and vapor cavities, sufficient for severe cavitation damage, were observed immediately upstream of the sluice intake and resulted in significant fluctuations of pressures in the bell-mouthed intake for the majority of flow conditions. Recommended modifications type 5 design incorporated into the original design included raising the riser invert to el 825 and placing a 2V-on-1H fillet on the riser invert. These modifications streamlined flow conditions into the sluice which eliminated the vortices and vapor cavities that formed upstream of the sluice intake with the original design and reduced pressure fluctuations in the bell-mouthed intake to a minimum.
- Civil Engineering