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|Title:||Selective withdrawal riser for Sutton Dam, West Virginia : hydraulic model investigation|
|Authors:||United States. Army. Corps of Engineers. Huntington District.|
George, John F.
Dortch, Mark S.
Tate, Charles H.
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-80-4.|
Abstract: Two models were used to ensure satisfactory hydraulic performance and define the selective withdrawal characteristics of the proposed semicircular riser to be attached to the upstream side of the center sluice of Sutton Dam. A 1:20-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. A 1:40-scale model of the type 5 riser, sluice intake, and a 44-ft-long section of the sluice was used to determine the selective withdrawal characteristics of the proposed structural modification to provide a selective withdrawal outlet. Results from this study were used to modify an existing numerical selective withdrawal predictive technique that forms part of a lake temperature and turbidity simulation model that will be used by the Ohio River Division to determine the best plan of operating the project with the withdrawal structure to control in-lake and downstream temperature and turbidity.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
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