Interference of Dual Spillways Operations
Publication: Journal of Hydraulic Engineering
Volume 145, Issue 5
Abstract
Dual spillway interference refers to the loss of hydraulic performance of spillways when they are placed close together. Spillway interference is examined using both physical experiments and numerical simulations. Stage and discharge measurements from four physical models with dual spillways configurations are compared to the Flow-3D computational results at four dam sites in South Korea. The conjunctive use of two spillways is compared with the singular operation of each spillway. When both spillways are operated at the same time, the total flow rate through the two spillways is reduced by up to 7.6%. Interference coefficients are most significant when the stage exceeds the design stage and when the distance separating two spillways is short compared to the spillway width . The parameter correlates very well with the calculated and measured interference coefficients. A flood routing example for the design discharge at Andong dam shows a 42 cm difference in reservoir water level with and without application of the interference coefficient. Consequently, the width of additional spillways (including the interference coefficient) should be increased for dam safety.
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Published In
Journal of Hydraulic Engineering
Volume 145 • Issue 5 • May 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jan 5, 2018
Accepted: Oct 30, 2018
Published online: Mar 13, 2019
Published in print: May 1, 2019
Discussion open until: Aug 13, 2019
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