Hydraulic Characteristics and Reduction Measure for Rooster Tails Behind Spillway Piers
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During flood discharge in a hydraulic project, rooster tails occur downstream of the piers in the spillway and have adverse effects on the operation of the discharge chute. The present paper provides an experimental study of the rooster tail generated by a pier in a chute spillway. Causes of the rooster tail were analyzed, and factors affecting the characteristics of the rooster tail were investigated. The results indicate that rooster tail height is significantly influenced by several parameters, including the spillway slope ratio, pier width and type, and outlet section water depth. A new formula was developed for estimating rooster tail height, and all the experimental data fit well in the selected experimental range. Moreover, a composite sloping-tail pier was designed based on the generation mechanism of the rooster tail. This pier can effectively eliminate rooster tail and has simple construction and lower costs.
KeywordsRooster tail Spillway Pier Hydraulic characteristics Physical model
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- 3.Ghadimi, P.; Dashtimanesh, A.; Zamanian, R.; et al.: Rooster tail depression by originating a modified transom stern form using a Reynolds averaged Navier Stokes solver. Sci. Iran. Trans. B Mech. Eng. 22(3), 765–777 (2015)Google Scholar
- 4.Wu, J.H.; Cai, C.G.; Ji, W.; et al.: Experimental study on cavitation and water-wing for middle-piers of discharge tunnels. J. Hydrodyn. Ser. B 17(4), 429–437 (2005)Google Scholar
- 5.Chen, S.; Zhang, J.; Hu, M.; et al.: Experimental study on water-wing characteristics induced by piers in flood drainage culverts. Sci. Iran. Trans. A Civ. Eng. 20(5), 1320–1326 (2013)Google Scholar
- 11.Carnacina, I.; Kurdistani, S.M.; Palermo, M.; et al.: El Chaparral dam Model: Rooster Tail Formation on High Sloped Spillway, pp. 65–73. School of Civil Engineering, Brisbane (2010)Google Scholar
- 13.Najafi, M.R.; Zarrati, A.R.: Numerical simulation of air-water flow in gated tunnels. Water Manag. 163(6), 289–295 (2010)Google Scholar
- 16.Najafi, M.R.; Kavianpour, M.R.; Roshan, U.; et al.: Controlling rooster tail development in gated tunnels. Int. J. Hydropower Dams 20(1), 60–65 (2013)Google Scholar
- 18.Duan, W.J.: The submerged sloping-tail pier—an effective measure to eliminate the crown of jumping flow. J. Sichuan Univ. (Eng. Sci. Ed.) 1, 63–67 (1982). (in Chinese)Google Scholar
- 20.Reinauer, R.; Hager, W.H.: Pier waves in sloping chutes. Int. J. Hydropower Dams 4(3), 100–103 (1997)Google Scholar
- 23.Rouse, H.; Bhoota, B.V.; Hsu, E.Y.: High-velocity flow in open channels: a symposium: design of channel expansion. Trans. Am. Soc. Civ. Eng. 116(1), 347–363 (1951)Google Scholar