Experimental Study of Free-Surface Aeration and Turbulent Processes Down an Embankment Dam Stepped Spillway

Gonzalez, C. A. (2003). Experimental Study of Free-Surface Aeration and Turbulent Processes Down an Embankment Dam Stepped Spillway. In: Ganoulis, J. and Prinos, P., XXX IAHR congress, Thessaloniki, Greece, (). 24-29 August, 2003.

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Author Gonzalez, C. A.
Title of paper Experimental Study of Free-Surface Aeration and Turbulent Processes Down an Embankment Dam Stepped Spillway
Conference name XXX IAHR congress
Conference location Thessaloniki, Greece
Conference dates 24-29 August, 2003
Publication Year 2003
Sub-type Fully published paper
Editor Ganoulis, J.
Prinos, P.
Abstract/Summary Research on stepped chute hydraulics has become an important tool for operational safety and design optimisation of these structures. Detailed experimental data is scarce and limited to very steep slopes (slope>50 deg). This work details an experimental investigation of the physical flow characteristics of stepped chute flows conducted in a large-size laboratory model with a moderate slope typical of embankment dam slopes (h=0.1m, slope=16 deg) operating with transition and skimming flow regimes. New original data include air concentration, airwater flow velocity and air-water flow turbulence intensity. The results suggest that air-water flow characteristics are not totally understood although there are some well-known features(eg. cavity recirculation) that influence significantly its behaviour in both skimming and transition flow conditions.
Subjects 290802 Water and Sanitary Engineering
290800 Civil Engineering
Keyword stepped spillway
air entrainment
air-water flow properties
turbulence intensity
turbulent mixing layers
cavity re-circulation
References 1. Chanson, H. (1997b). Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Academic Press, London, UK, 401 pages. 2. Chanson, H. (1998). Review of studies on Stepped Channel flows. Workshop on Flow Characteristics around hydraulic structures and River Environment. University Research Center, Nihon University, Japan. 3. Chanson, H., Yasuda Y., and Ohtsu I. (2000). Flow resistance in Skimming Flow: A Critical Review. Intl. Workshop on Hydraulics of stepped spillways, H.E Minor & W.H. Hager Balkema Publishers, Zurich, Switzerland. 4. Chanson, H. (2002). The Hydraulics of Stepped Chutes and Spillways. Balkema Publishers, Rotterdam, The Netherlands. 5. Chanson, H., and Toombes, L. (2002). Experimental Investigations of Air Entrainment in Transition and skimming flows down a stepped chute Can. Jl. Civ. Eng, Vol.29, pp. 145-156 pages. 6. Chanson, H., and Toombes, L. (2002). Air-Water Flows down Stepped chutes: Turbulence and Flow Structure Observations. Intl Jl of Multiphase Flow, Vol. 27, No.11, pp. 1737-1761. 7. Crowe, C., Sommerfeld, M., and TSUJI, Y. (1998). Multiphase Flows with Droplets and Particles. CRC Press, Boca Raton, USA, 471 pages. 8. Cummings, P.D. (1996). Aeration due to breaking waves. Ph.D Thesis, The University of Queensland, Brisbane, Australia. 9. Matos, J., Yasuda, Y., and Chanson, H. (2001). Interaction between free-surface aeration and cavity re-circulation in skimming flows down stepped chutes. Proc. XXIX IAHR Congress, Beijing, China, Theme D, pp. 611-617. 10. Ohtsu, I., and Yasuda, Y. (1997). Characteristics of Flow Conditions on Stepped Channels. Proc. XXVII IAHR Congress, San Francisco, USA, Theme D, pp. 583-588. 11. Rajaratnam, N. (1976). Turbulent jet flows. Elsevier, Amsterdam, The Netherlands. 12. Schlichting, H. (1979). Boundary Layer Theory. McGraw-Hill, New York, USA, 7th edition. 13. Toombes, L. (2002). Experimental Study of Air-water flow properties on low-gradient stepped cascades. Ph.D. Thesis, The University of Queensland, Brisbane, Australia. 14. Wygnansky, I. and Fiedler, H. (1970). The Two-dimensional Mixing Region. Jl. Of Fluid Mchanics, Vol.41, pp. 327-361.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: School of Civil Engineering Publications
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Created: Fri, 05 Aug 2005, 10:00:00 EST by Carlos A. Gonzalez on behalf of Research Management Office