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Turbulent characteristics of a shallow wall-bounded plane jet: experimental implications for river mouth hydrodynamics

  • JOEL C. ROWLAND (a1), MARK T. STACEY (a2) and WILLIAM E. DIETRICH (a3)

Abstract

Jets arising from rivers, streams and tidal flows entering still waters differ from most experimental studies of jets both in aspect ratio and in the presence of a solid bottom boundary and an upper free surface. Despite these differences, the applicability of experimental jet studies to these systems remains largely untested by either field or realistically scaled experimental studies. Here we present experimental results for a wall-bounded plane jet scaled to jets created by flow discharging into floodplain lakes. A characteristic feature of both our prototype and experimental jets is the presence of large-scale meandering turbulent structures that span the width of the jets. In our experimental jets, we observe self-similarity in the distribution of mean streamwise velocities by a distance of six channel widths downstream of the jet outlet. After a distance of nine channel widths the velocity decay and the spreading rates largely agree with prior experimental results for plane jets. The magnitudes and distributions of the cross-stream velocity and lateral shear stresses approach self-preserving conditions in the upper half of the flow, but decrease in magnitude, and deviate from self-preserving distributions with proximity to the bed. The presence of the meandering structure has little influence on the mean structure of the jet, but dominates the jet turbulence. A comparison of turbulence analysed at time scales both greater than and less than the period of the meandering structure indicates that these structures increase turbulence intensities by 3–5 times, and produce lateral shear stresses and momentum diffusivities that are one and two orders of magnitude greater, respectively, than turbulence generated by bed friction alone.

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Corresponding author

Present address: Earth and Environmental Sciences Division, Los Alamos National Lab, Los Alamos, NM 87545, USA. Email address for correspondence: jrowland@lanl.gov

References

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Abramovich, G. N. 1963 Theory of Turbulent Jets. MIT Press.
Agrawal, A. & Prasad, A. K. 2003 Integral solution for the mean flow profiles of turbulent jets, plumes, and wakes. J. Fluids Engng 125 (5), 813822.
Albertson, M. L., Dai, Y. B., Jensen, R. A. & Rouse, H. 1950 Diffusion of submerged jets. Trans. Am. Soc. Civil Engineers 115, 639664.
Bates, C. C. 1953 Rational theory of delta formation. AAPG Bull. 37 (9), 21192162.
Biron, P., Roy, A. G. & Best, J. L. 1995 A scheme for resampling, filtering, and subsampling unevenly spaced laser-doppler anemometer data. Math. Geol. 27 (6), 731748.
Borichansky, L. S. & Mikhailov, V. N. 1966 Interaction of river and sea water in the absence of tides. In Scientific Problems of the Humid Tropical Zone Deltas and their Implications, pp. 175180. UNESCO.
Bradbury, L. J. S. 1965 The structure of a self-preserving turbulent plane jet. J. Fluid Mech. 23 (1), 3164.
Chen, D. Y. & Jirka, G. H. 1997 Absolute and convective instabilities of plane turbulent wakes in a shallow water layer. J. Fluid Mech. 338, 157172.
Dracos, T., Giger, M. & Jirka, G. H. 1992 Plane turbulent jets in a bounded fluid layer. J. Fluid Mech. 241, 587614.
Edmonds, D. A. & Slingerland, R. L. 2007 Mechanics of middle-ground bar formation: implications for the morphodynamics of delta distributary networks. J. Geophys. Res.-Earth Surf. 112.
Fischer, H. B. 1973 Longitudinal dispersion and turbulent mixing in open-channel flow. Annu. Rev. Fluid Mech. 5, 5978.
Foss, J. F. & Jones, J. B. 1968 Secondary flow effects in a bounded rectangular jet. J. Basic Engng 90 (2), 241248.
Giger, M., Dracos, T. & Jirka, G. H. 1991 Entrainment and mixing in plane turbulent jets in shallow-water. J. Hydraulic Res. 29 (5), 615642.
Holdeman, J. D. & Foss, J. F. 1975 Initiation, development, and decay of secondary flow in a bounded jet. J. Fluids Engng–Trans. Asme 97 (3), 342352.
Izumi, N., Tanaka, H. & Date, M. 1999 Inceptive topography of fluvial-dominated river mouth bars. In River Sedimentation (ed. Lee, & Wang, ). Balkema.
Jirka, G. H. 1994 Shallow jets. In Recent Research Advances in the Fluid Mechanics of Turbulent Jets and Plumes (ed. Davies, P. A. & Neves, M. J. Valente), pp. 155175. Kluwer Academic Publishers.
Jirka, G. H. 2001 Large scale flow structures and mixing processes in shallow flows. J. Hydraulic Res. 39 (6), 567573.
Joshi, P. B. 1982 Hydromechanics of tidal jets. J. the Waterway Port Coastal Ocean Div.–ASCE 108 (3), 239253.
Kostaschuk, R. A. 1985 River mouth processes in a fjord-delta, British Columbia, Canada. Marine Geol. 69 (1–2), 123.
Lane, S. N., Biron, P. M., Bradbrook, K. F., Butler, J. B., Chandler, J. H., Crowell, M. D., McLelland, S. J., Richards, K. S. & Roy, A. G. 1998 Three-dimensional measurement of river channel flow processes using acoustic doppler velocimetry. Earth Surf. Processes Landforms 23 (13), 12471267.
Old, C. P. & Vennell, R. 2001 Acoustic doppler current profiler measurements of the velocity field of an ebb tidal jet. J. Geophys. Res.–Oceans 106 (C4), 70377049.
Ozsoy, E. 1977 Flow and mass transport in the vicinity of tidal inlets. Tech. Rep. TR-036. University of Florida, Coastal and Oceanographic Engineering Laboratory.
Ozsoy, E. & Unluata, U. 1982 Ebb-tidal flow characteristics near inlets. Estuarine Coastal Shelf Sci. 14 (3), 251263.
van Prooijen, B. C. & Uijttewaal, W. S. J. 2002 A linear approach for the evolution of coherent structures in shallow mixing layers. Phys. Fluids 14 (12), 41054114.
Reichardt, H. 1942 Gesetzmäßigkeiten der freien turbulenz. VDI—Forschungsheft 414.
Rowland, J. C. 2007 Tie channels. PhD thesis, University of California, Berkeley.
Rowland, J. C. & Dietrich, W. E. 2006 The evolution of a tie channel. In River, Coastal and Estuarine Morphodynamics: RCEM 2005 (ed. Parker, G. & Garcia, M. H.), pp. 725736. Taylor & Francis.
Rowland, J. C., Dietrich, W. E., Day, G. & Parker, G. In press. The formation and maintenance of single-thread tie channels entering floodplain lakes: observations from three diverse river systems. J. Geophys. Res.-Earth Surf.
Rowland, J. C., Lepper, K., Dietrich, W. E., Wilson, C. J. & Sheldon, R. 2005 Tie channel sedimentation rates, oxbow formation age and channel migration rate from optically stimulated luminescence (OSL) analysis of floodplain deposits. Earth Surf. Processes Landforms 30 (9), 11611179.
Schlichting, H. 1968 Boundary-Layer Theory, 6th ed. McGraw-Hill Book Company.
Seo, I. W. & Kwon, S. J. 2005 Experimental investigation of three-dimensional nonbuoyant rectangular jets. J. Engng Mech. 131 (7), 733746.
Socolofsky, S. A. & Jirka, G. H. 2004 Large-scale flow structures and stability in shallow flows. J. Environmental Engng Sci. 3 (5), 451462.
Syvitski, J. P., Skene, K. I., Nicholson, M. K. & Morehead, M. D. 1998 Plume1.1: deposition of sediment from a fluvial plume. Comput. Geosci. 24 (2), 159171.
Tennekes, H. & Lumley, J. L. 1972 A First Course in Turbulence. The MIT Press
Tollmien, W. 1926 Berechnung turbulenter ausbreitungsvorgange. Zeitschrift fur Angewandte Mathematik und Mechanik 6, 468478.
Townsend, A. A. 1976 The Structure of Turbulent Shear Flow, 2nd edn. Cambridge University Press.
Wang, F. C. 1984 The dynamics of a river-bay-delta system. J. Geophys. Res.-Oceans 89 (NC5), 80548060.
Wright, L. D. 1977 Sediment transport and deposition at river mouths – synthesis. Geol. Soc. Am. Bull. 88 (6), 857868.
Wright, L. D. & Coleman, J. M. 1974 Mississippi river mouth processes – effluent dynamics and morphologic development. J. Geol. 82 (6), 751778.
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Rowland et al. supplementary movie
Movie 1. Overhead video of experimental jet showing large-scale meandering turbulent structures. Blue gridded squares are 20 cm by 20 cm. Flow is from left to right with yellow/green dye for visualization. Flow depth is 5 cm and flow velocity at outlet is 53 cm/s.

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Turbulent characteristics of a shallow wall-bounded plane jet: experimental implications for river mouth hydrodynamics

  • JOEL C. ROWLAND (a1), MARK T. STACEY (a2) and WILLIAM E. DIETRICH (a3)

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