Turbulent Flow and Sand Transport over a Cobble Bed in a Laboratory Flume
Publication: Journal of Hydraulic Engineering
Volume 140, Issue 4
Abstract
Improving the prediction of sand transport downstream of dams requires characterization of the interaction between turbulent flow and near-surface interstitial sands. The advanced age and impending decommissioning of many dams have brought increased attention to the fate of sediments stored in reservoirs. Sands can be reintroduced to coarse substrates that have available pore space resulting from periods of sediment-starved flow. The roughness and porosity of the coarse substrate are both affected by sand elevation relative to the coarse substrate; therefore, the turbulence characteristics and sediment transport over and through these beds are significantly altered after sediment is reintroduced. Past work by the writers on flow over sand-filled gravel beds revealed that the fine-sediment level controls the volume of material available for transport and the area of sediment exposed to the flow. The present work expands on the gravel-bed experiments by conducting similar measurements of turbulent flow and sand transport over a bed of cobbles with a median diameter of approximately 150 mm. This change in scale expands the generality of the previous experiments and broadens the range of sand transport and turbulence measurements. It was found that the same relationship between bed shear stress and sand elevation was valid for both gravel and cobble systems. Reductions in bed shear stress, relative to the clear-water case, were observed as the sand elevation was increased, although the highest sand elevation did not yield the lowest shear stress. Quadrant analysis showed that, for stronger turbulent events, there was an increase of sweeps and a decrease in bursts as the sand level was raised. This effect was observed for a region with a height of approximately 1.4 times the thickness of the roughness layer.
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Acknowledgments
This work would not have been possible without the diligent and capable efforts of Glenn Gray. The quality of the data presented here is largely a reflection of Glenn Gray’s attention to detail and his strict adherence to good experimental procedure over months and years of data collection. Will Simpson helped in the arduous task of placing the cobbles in the flume.
References
Aberle, J., Koll, K., and Dittrich, A. (2008). “Form induced stresses over rough gravel-beds.” Acta Geophys., 56(3), 584–600.
Aberle, J., and Smart, G. M. (2003). “The influence of roughness structure on flow resistance on steep slopes.” J. Hydraul. Res., 41(3), 259–269.
Allen, J. R. L. (1985). Principles of physical sedimentology, Chapman and Hall, New York.
Bathurst, J. C. (1985). “Flow resistance estimation in mountain rivers.” J. Hydraul. Eng., 625–643.
Blois, G., Sambrook Smith, G., Best, J., Hardy, R., and Lead, J. (2012). “Quantifying the dynamics of flow within a permeable bed using time-resolved endoscopic particle imaging velocimetry (epiv).” Exp. Fluids, 53(1), 51–76.
Canovaro, F., Paris, E., and Solari, L. (2007). “Effects of macro-scale bed roughness geometry on flow resistance.” Water Resour. Res., 43(10).
Carson, M. A. (1987). “Measures of flow intensity as predictors of bed load.” J. Hydraul. Eng., 1402–1421.
Chamani, M., and Rajaratnam, N. (1999). “Characteristics of skimming flow over stepped spillways.” J. Hydraul. Eng., 361–368.
Chiew, Y., and Parker, G. (1994). “Incipient motion on non-horizontal slopes.” J. Hydraul. Res., 32(5), 649–660.
Cooper, J. R., and Tait, S. J. (2008). “The spatial organization of time-averaged streamwise velocity and its correlation with the surface topography of water-worked gravel beds.” Acta Geophys., 56(3), 614–642.
Curran, J., and Tan, L. (2013). “The effect of bed sand content on the turbulent flows associated with clusters on an armored gravel bed surface.” J. Hydraul. Eng.,.
Finlay, J. C., Power, M. E., and Cabana, G. (1999). “Effects of water velocity on algal carbon isotope ratios: Implications for river food web studies.” Limnol. Oceanogr., 44(5), 1198–1203.
Grams, P. E., and Wilcock, P. R. (2007). “Equilibrium entrainment of fine sediment from a coarse immobile bed.” Water Resour. Res., 43(10), W10420.
Kleinhans, M. G. (2002). “Sorting out sand and gravel: Sediment transport and deposition in sand-gravel bed rivers.” Ph.D. thesis, Netherlands Geographical Studies, NGS 293, The Netherlands. 317.
Kuhnle, R. A., Wren, D. G., and Langendoen, E. L. (2013). “Sand transport over an immobile gravel substrate.” J. Hydraul. Eng., 167–176.
Lawrence, D. S. (2000). “Hydraulic resistance in overland flow during partial and marginal surface inundation: Experimental observations and modeling.” Water Resour. Res., 36(8), 2381–2393.
Lu, S. S., and Willmarth, W. W. (1973). “Measurements of the structure of the Reynolds stress in a turbulent boundary layer.” J. Fluid Mech., 60(3), 481–511.
Manes, C., Pkrajac, D., Nikora, V. I., Ridolfi, L., and Poggi, D. (2011). “Turbulent friction in flows over permeable walls.” Geophys. Res. Lett., 38(3).
Manes, C., Pokrajac, D., and McEwan, I. (2007). “Double-averaged open-channel flows with small relative submergence.” J. Hydraul. Eng., 896–904.
McDonald, R., Nelson, J., Paragamian, V., and Barton, G. (2010). “Modeling the effect of flow and sediment transport on white sturgeon spawning habitat in the Kootenai River, Idaho.” J. Hydraul. Eng., 1077–1092.
Meyer-Peter, E., and Müller, R. (1948). “Formulas for bedload transport.” Proc., 2nd Meeting of the Int. Association of Hydraulic Structures Research, International Association of Hydraulic Engineering and Research, Netherlands, Delft, 39–64.
Middleton, G. V., and Southard, J. B. (1984). Mechanics of sediment movement, Society of Economic Paleontologists and Mineralogists, Tulsa, OK.
Mignot, E., Barthelemy, E., and Hurther, D. (2009). “Double-averaging analysis and local flow characterization of near-bed turbulence in gravel-bed channel flows.” J. Fluid Mech., 618(1), 279–303.
Miller, M. C., McCave, I. N., and Komar, P. D. (1977). “Threshold of sediment motion under unidirectional currents.” Sedimentology, 24(4), 507–527.
Morris, H. M. (1955). “Flow in rough conditions.” Trans. Am. Soc. Civ. Eng., 120(1), 373–398.
Nikora, V., et al. (2007b). “Double-averaging concept for rough-bed open-channel and overland flows: Applications.” J. Hydraul. Eng., 884–895.
Nikora, V., McEwan, I., McLean, S., Coleman, S., Pokrajec, D., and Walters, R. (2007a). “Double-averaging concept for rough-bed open-channel and overland flows: Theoretical background.” J. Hydraul. Eng., 873–883.
Parker, G., and Peterson, A. W. (1980). “Bar resistance of gravel-bed streams.” J. Hydraul. Div., 106(10), 1559–1575.
Reidenbach, M. A., Limm, M., Hondzo, M., and Stacey, M. T. (2010). “Effects of bed roughness on boundary layer mixing and mass flux across the sediment-water interface.” Water Resour. Res., 46(7).
Rickenmann, D., and Recking, A. (2011). “Evaluation of flow resistance in gravel-bed rivers through a large field data set.” Water Resour. Res., 47(7).
Ryan, R. J., Packman, A. I., and Kilham, S. (2007). “Relating phosphorus uptake to changes in transient storage and streambed sediment characteristics in headwater tributaries of Valley Creek, an urbanizing watershed.” J. Hydrol., 336(3–4), 444–457.
Schlichting, H. (1968). Boundary-layer theory, McGraw-Hill, New York.
Stoesser, T. (2010). “Physically realistic roughness closure scheme to simulate turbulent channel flow over rough beds within the framework of les.” J. Hydraul. Eng., 812–819.
Tan, L., and Curran, J. (2012). “Comparison of turbulent flows over clusters of varying density.” J. Hydraul. Eng., 1031–1044.
Topping, D. J., Wright, S. A., Griffiths, R. E., Melis, T. S., Rubin, D. M., and Sabol, T. A. (2010). “High-resolution measurements of suspended-sediment concentration and grain size in the Colorado River in Grand Canyon using a multi-frequency acoustic system.” 2nd Joint Federal Interagency Conf., Federal Interagency Sedimentation Committee, Vicksburg, MS.
Tuijnder, A., Ribberink, J., and Hulscher, S. (2009). “An experimental study into the geometry of supply-limited dunes.” Sedimentology, 56(6), 1713–1727.
Tuijnder, A. P. (2010). “Sand in short supply, modeling of bedforms, roughness, and sediment transport in rivers under supply-limited conditions.” Ph.D. thesis, Univ. of Twente, Twente, The Netherlands, 148.
Tuijnder, A. P., and Ribberink, J. S. (2012). “Experimental observation and modelling of roughness variation due to supply-limited sediment transport in uni-directional flow.” J. Hydraul. Res., 50(5), 506–520.
Vanoni, V. A. (1975). Sedimentation engineering ASCE manual 54, ASCE, New York.
Vanoni, V. A., and Brooks, N. H. (1957). “Laboratory studies of the roughness and suspended load of alluvial streams.”, California Institute of Technology, Pasadena, CA.
Wilcock, P. R., and Kenworthy, S. T. (2002). “A two-fraction model for the transport of sand/gravel mixtures.” Water Resour. Res., 38(10), 12-1–12-12.
Wohl, E. E., and Cenderelli, D. A. (2000). “Sediment deposition and transport patterns following a reservoir sediment release.” Water Resour. Res., 36(1), 319–333.
Wren, D. G., Kuhnle, R. A., and Wilson, C. G. (2007). “Measurements of the relationship between turbulence and sediment in suspension over mobile sand dunes in a laboratory flume.” J. Geophys. Res.:Earth Surface, 112(F3).
Wren, D. G., Langendoen, E. J., and Kuhnle, R. A. (2011). “Effects of sand addition on turbulent flow over an immobile gravel bed.” J. Geophys. Res.:Earth Surface, 116(F1).
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Published In
Journal of Hydraulic Engineering
Volume 140 • Issue 4 • April 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 1, 2013
Accepted: Oct 30, 2013
Published online: Nov 4, 2013
Published in print: Apr 1, 2014
Discussion open until: Jun 10, 2014
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