Effect of Jet Air Content on Plunge Pool Scour
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Volume 129, Issue 5
Abstract
The effect of air discharge on plunge pool scour was investigated by using a simplified experimental configuration. Instead of considering the complete arrangement involving chute and deflector resulting in an air-water jet impinging on a sediment surface, the mixture flow was produced with a circular pipe for which the air concentration and the jet diameter close to impact on the free water surface are known. The results of this study were primarily directed to the definition of a three-phase Froude number that accounts for the combined effects of an air-water mixture jet on scour. The analysis of data allows simple estimates of the scour geometry including a generalized scour profile, the width of scour, and the temporal advance of the extreme scour depths. It was pointed out that for a certain water velocity and selected grain characteristics, the addition of air to the jet results in an increase of scour depth. However, if the reference would be the air-water mixture velocity, scour depth decreases significantly by the addition of air to the jet.
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References
Blaisdell, F. W., and Anderson, C. L.(1991). “Pipe plunge pool energy dissipator.” J. Hydraul. Eng., 117(3), 303–323.
Chee, S. P., and Kung, T. (1983). “Theoretical configurations of scour basins.” Proc., 6th Canadian Hydrotechnical Conf., Ottawa, 569–579.
Gunko, F. G., Burkov, A. F., Isachenko, N. B., Rubinstein, G. L., Soloviova, A. G., and Yuditsky, G. A. (1965). “Research of the hydraulic regime and local scour of river bed below spillways of high-head dams.” Proc., 11th Int. Association of Hydraulic Research (IAHR) Congress, Leningrad, 1(50), 1–14.
Hager, W. H.(1998). “Plunge pool scour: Early history and hydraulicians.” J. Hydraul. Eng., 124(12), 1185–1187.
Johnson, G. (1967). “The effect of entrained air on the scouring capacity of water.” Proc., 12th IAHR Congress, Fort Collins, Colo., 3(C26), 1–9.
Juon, R., and Hager, W. H.(2000). “Flip bucket without and with deflectors.” J. Hydraul. Eng., 126(11), 837–845.
Martins, R. (1973). “Contribution to the knowledge on the scour action of free jets on rocky riverbeds.” Proc.,11th Int. Commission on Large Dams, (ICOLD) Congress, Madrid, Spain, Q41(R44), 799–814.
Martins, R. B. F.(1975). “Scouring of rocky riverbeds by free-jet spillways.” Water Power Dam Constr., 27(4), 152–153.
Mason, P. J. (1984a). “Erosion of plunge pools downstream of dams due to the action of free-trajectory jets.” Proc., Inst. Civ. Eng., Part 1, 76, 523–537.
Mason, P. J.(1984b). “Discussion of ‘Erosion of plunge pools downstream of dams due to the action of free-trajectory jets.’ ” Proc. Inst. Civ. Eng., Part 1, 78, 991–999.
Mason, P. J.(1989a). “Effects of air entrainment on plunge pool scour.” J. Hydraul. Eng., 115(3), 385–399.
Mason, P. J.(1989b). “Discussion of ‘Effects of air entrainment on plunge ool scour.’ ” J. Hydraul. Eng., 117(2) 256–265.
Mason, P. J., and Arumugam, K.(1985a). “Free jet scour below dams and flip buckets.” J. Hydraul. Eng., 111(2), 220–235.
Mason, P. J., and Arumugam, K. (1985b). “Discussion of ‘Free jst scour below dams and filp buckets.’ ” J. Hydraul. Eng., 113(9), 1192–1205.
Rajaratnam, N.(1982a). “Erosion by submerged circular jets.” J. Hydraul. Div., Am. Soc. Civ. Eng., 108(2), 262–267.
Rajaratnam, N.(1982b). “Discussion of ‘Erosion by submerged circular jets.’ ” J. Hydraul. Div., Am. Soc. Civ. Eng., 109(2), 324.
Rajaratnam, N. (1982c). “Erosion by unsubmerged plane water jets.” Proc., Conf. Applying Research to Hydraulic Practice, ASCE, New York, 280–288.
Vischer, D. L., and Hager, W. H. (1998). Dam hydraulics, Wiley, Chichester, England.
Whittaker, J. G., and Schleiss, A. (1984). “Scour related to energy dissipaters for high head structures.” Mitteilung, 73. Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie VAW, ETH: Zurich.
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Published In
Journal of Hydraulic Engineering
Volume 129 • Issue 5 • May 2003
Pages: 358 - 365
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 20, 2002
Accepted: Nov 19, 2002
Published online: Apr 15, 2003
Published in print: May 2003
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