Flow Patterns in a Four-Branch Junction with Supercritical Flow
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VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 134, Issue 6
Abstract
This paper describes the flow structures that occur in a 90° junction of four open channels with supercritical flow in two orthogonal inlet channels. An experimental facility was constructed to permit the measurement of flow rates, water depths, and the positions of hydraulic jumps in the channels. The various flow patterns which appear depend on the characteristics of the incoming flows and can be classified into three main types, depending on the location and shape of the hydraulic jumps that develop. These jumps can either be normal to the flow and located in the upstream channels, or can be oblique and confined within the junction. The explanation for the existence of various flow patterns is derived from previous studies of the rapid deflection of supercritical flow. A detailed description of each flow regime is provided, with information on the surface elevations, the behavior of the hydraulic jumps, the deflections of the incoming flows, and the formation and characteristics of recirculation zones.
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Acknowledgments
The experimental installation was designed and constructed by P. Dutheil, and we gratefully acknowledge his contribution to the project. The research was funded by the French CNRS (SPI-ACI jeune chercheur “Hydraulics in urban areas,” 2002), the program ECCO-PNRH 2003 (Project No. UNSPECIFIED31), and by the French Environment Ministry under the Rio2 Program “Assessment of the surface flows for an extreme flood in urbanized areas.” The writers are grateful to students D. Garreau and P. Pointereau for their help with the measurements.
References
Behlke, C. E., and Pritchett, H. D. (1966). “The design of supercritical flow channel junctions.” Highway Research Record. 123, Transportation Research Board, Washington, D.C., 17–35.
Biron, P. M., Ramamurthy, A. S., and Han, S. (2004). “Three-dimensional numerical modeling of mixing at river confluences.” J. Hydraul. Eng., 130(3), 243–253.
Bowers, C. E. (1950). “Hydraulic model studies for Whiting Field Naval Air Station, Part V: Studies of open-channel junctions.” Technical Papers, Series B, St Anthony Falls Laboratory, Univ. of Minnesota, Minneapolis, Minn.
Greated, C. A. (1968). “Supercritical flow through a junction.” Houille Blanche, 23(8), 693–695.
Hager, W. H. (1989). “Supercritical flow in channel junction.” J. Hydraul. Eng., 115(5), 595–616.
Hager, W. H., and Yasuda, Y. (1997). “Unconfined expansion of supercritical water flow.” J. Eng. Mech., 123(5), 451–457.
Haider, S., Paquier, A., Morel, R., and Champagne, J.-Y. (2003). “Urban flood modelling using computational fluid dynamics.” Proc. Inst. Civ. Eng., 156(2), 129–135.
Inoue, K., Kawaike, K., and Hayashi, H. (2000). “Numerical simulation models on inundation flow in urban area.” JSCE (Jpn. Soc. Civ. Eng.), 18(1), 119–126.
Ippen, A. T. (1951). “Mechanics of supercritical flow: 1st paper of high-velocity flow in open channels: A symposium.” Trans. ASCE, 116, 268–295.
Ishigaki, T., Nakagawa, H., and Baba, Y. (2004). “Hydraulic model test and calculation of flood in urban area with underground space.” Environmental hydraulics and sustainable water management, Lee, J. H. W. and Lam, K. M., eds., Vol. 2, Balkema, Rotterdam, The Netherlands, 1411–1416.
Kenworthy, S. T., and Rhodes, B. L. (1995). “Hydrologic control of spatial patterns of suspended sediment concentration at a stream confluence.” J. Hydrol., 168, 251–263.
Mignot, E., Paquier, A., and Haider, S. (2006). “Modeling floods in a dense urban area using 2D shallow water equations.” J. Hydrol., 327(1–2), 186–199.
Nania, L. S., Gomez, M., and Dolz, J. (2004). “Experimental study of the dividing flow in steep street crossings.” J. Hydraul. Res., 42(4), 406–412.
Neary, V. S., Sotiropoulos, F., and Odgaard, A. J. (1999). “Three-dimensional numerical model of lateral-intake inflows.” J. Hydraul. Eng., 125(2), 126–140.
Ranga Raju, K. G., Asawa, G. L., and Mishra, H. K. (2000). “Flow-establishment length in rectangular channels and ducts.” J. Hydraul. Eng., 126(7), 533–539.
Rhodes, B. L., and Sukhodolov, A. N. (2001). “Field investigation of three dimensional flow structure at stream confluences: 1. Thermal mixing and time-averaged velocities.” Water Resour. Res., 37(9), 2393–2410.
Rice, C. E. (1985). “Open channel junctions with supercritical flow.” ARS-14, United States Department of Agriculture, Agricultural Research Service, Washington, D.C.
Rivière, N., and Perkins, R. J. (2004). “Supercritical flow in channel intersections.” Proc., RiverFlow 2004, 2nd Int. Conf. on Fluvial Hydraulics, M. Grecco, A. Carravetta, and R. Della Morte, eds., IAHR, Napoli, Italy, 1073–1077.
Schwalt, M., and Hager, W. H. (1995). “Experiments to supercritical junction flow.” Exp. Fluids, 18, 429–437.
Smith, J. A., Miller, A. J., Baeck, M. L., Nelson, P. A., Fisher, G. T., and Meierdiercks, K. L. (2005). “Extraordinary flood response of a small urban watershed to short-duration convective rainfall.” J Hydrometeorol., 6(5), 599–617.
Weber, L. J., Schumate, E. D., and Mawer, N. (2001). “Experiments on flow at a 90° open-channel junction.” J. Hydrol. Eng., 127(5), 340–350.
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© 2008 ASCE.
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Received: Jun 21, 2005
Accepted: Sep 13, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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