Abstract
To achieve a complete knowledge about the effect of particle concentration on sediment and turbulent diffusion coefficients in open-channel turbulent flow is a long-standing problem for the community of researchers. The effect of particle concentration is investigated on the sediment and turbulent diffusion coefficients through the inverse of turbulent Schmidt number or β which is defined by the ratio of sediment diffusion coefficient to turbulent diffusion coefficient. It is observed that with increasing particle concentration, the sediment diffusion coefficient decreases more in comparison with the turbulent diffusion coefficient for both dilute and non-dilute sediment-laden flows. The physical characteristics of β observed are expressed mathematically in terms of normalized settling velocity, reference level and reference concentration. The applicability of the mathematical formulae is confirmed by the agreement analysis between experimental data and particle concentration profile computed from the Rouse equations modified through the newly proposed expression of β. Apart from the better agreement between dilute particle concentration data and the developed Rouse equation, the striking observation is that the modified Rouse equation shows reasonable computational accuracy for non-dilute particle concentration data also. Minimum error is obtained from the present model when it is compared with the models proposed by the previous researchers.
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References
Ahrens JP (2000) A fall-velocity equation. J Waterw Port Coast Ocean Eng 126(2):99–102
Bagherimiyab F, Lemmin U (2012) Fine sediment dynamics in unsteady open-channel flow studied with acoustic and optical systems. Continent Shelf Res 46:2–15
Cao Z (1999) Equilibrium near-bed concentration of suspended sediment. J Hydraul Eng 125(12):1270–1278
Cellino M, Graf WH (1999) Sediment-laden flow in open-channels under noncapacity and capacity conditions. J Hydraul Eng 125(5):455–462
Cellino M, Graf WH (2000) Experiments on suspension flow in open channels with bed forms. J Hydraul Res 38(4):289–298
Cheng NS (1997) Simplified settling velocity formula for sediment particle. J Hydraul Eng 123(2):149–152
Cheng NS (2003) A diffusive model for evaluating thickness of bedload layer. Adv Water Resour 26(8):875–882
Cheng NS, Emadzadeh A (2014) Average velocity of solitary coarse grain in flows over smooth and rough beds. J Hydraul Eng 140(6):04014015
Cheng C, Song ZY, Wang YG, Zhang JS (2013) Parameterized expressions for an improved rouse equation. Int J Sedim Res 28(4):523–534
Chien N (1956) The present status of research on sediment transport. Trans Am Soc Civil Eng 121(1):833–868
Coleman NL (1986) Effects of suspended sediment on the open-channel velocity distribution. Water Resour Res 22(10):1377–1384
Einstein HA, Chien N (1955) Effects of heavy sediment concentration near the bed on velocity and sediment distribution. Missoury River Division, Corps of Engineers, US Army
Fu X, Wang G, Shao X (2005) Vertical dispersion of fine and coarse sediments in turbulent open-channel flows. J Hydraul Eng 131(10):877–888
Garcia M, Parker G (1991) Entrainment of bed sediment into suspension. J Hydraul Eng 117(4):414–435
Ghani AA, Azamathulla HM (2014) Development of gep-based functional relationship for sediment transport in tropical rivers. Neural Comput Appl 24(2):271–276
Ghoshal K, Pal D (2014) An analytical model for bedload layer thickness. Acta Mech 225(3):701–714
Graf WH, Cellino M (2002) Suspension flows in open channels; experimental study. J Hydraul Res 40(4):435–447
Guo J (2002) Logarithmic matching and its applications in computational hydraulics and sediment transport. J Hydraul Res 40(5):555–565
Hu C, Guo Q (2011) Near-bed sediment concentration distribution and basic probability of sediment movement. J Hydraul Eng 137(10):1269–1275
Jha SK, Bombardelli FA (2009) Two-phase modeling of turbulence in dilute sediment-laden, open-channel flows. Environ Fluid Mech 9(2):237–266
Kerssens PM, van Rijn LC, Prins A (1979) Model for suspended sediment transport. J Hydraul Div 105(5):461–476
Kironto BA, Yulistiyanto B (2009) The validity of Rouse equation for predicting suspended sediment concentration profiles in transverse direction of uniform open channel flow. In: International conference on sustainable development water waste water treatment, Yogyakarta, Indonesia pp 1–13
Kundu S, Ghoshal K (2013) An explicit model for concentration distribution using biquadratic-log-wake law in an open channel flow. J Appl Fluid Mech 6(3):339–350
Lyn DA (1988) A similarity approach to turbulent sediment-laden flows in open channels. J Fluid Mech 193(1):1–26
Majumdar H, Carstens MR (1967) Diffusion of particles by turbulence: effect of particle size. Report WRC-0967, Water Resources Center, Georgia Institute Technology
Mazumder BS, Ghoshal K, Dalal DC (2005) Influence of bed roughness on sediment suspension: experimental and theoretical studies. J Hydraul Res 43(3):245–257
Pal D, Ghoshal K (2014a) Effect of bed roughness on grain-size distribution in an open channel flow. J Hydro-Environ Res 8(4):441–451
Pal D, Ghoshal K (2014b) Mathematical model on grain-size distribution in suspension over sand-gravel bed. J Hydrol 511:640–647
Pu JH, Hussain K, Shao Sd, Yf Huang (2014) Shallow sediment transport flow computation using time-varying sediment adaptation length. Int J Sediment Res 29(2):171–183
Rouse H (1937) Modern conceptions of the mechanics of fluid turbulence. Trans Am Soc Civil Eng 102(1):463–505
Sun ZL, Sun ZF, Donahue J (2003) Equilibrium bed-concentration of nonuniform sediment. J Zhejiang Univ Sci A 4(2):186–194
Tsujimoto T (2010) Diffusion coefficient of suspended sediment and kinematic eddy viscosity of flow containing suspended load. In: Dittrich, Koll, Aberle, Geisenhainer (eds) River Flow, pp 801–806, ISBN 978-3-939230-00-7
van Rijn LC (1984) Sediment transport, part ii: suspended load transport. J Hydraul Eng 110(11):1613–1641
Wren DG, Bennett SJ, Barkdoll BD, Kuhnle RA (2005) Distributions of velocity, turbulence, and suspended sediment over low-relief antidunes. J Hydraul Res 43(1):3–11
Wu P, Jin YC (2010) Parameters used in modeling sediment-laden flow in open channels. In: Christodoulou GC, Stamou AI (eds) Environmental hydraulics. CRC Press, London, pp 265–270
Zheng J, Li RJ, Qing F, Lu SS (2013) Vertical profiles of fluid velocity and suspended sediment concentration in nearshore. Int J Sedim Res 28(3):406–412
Zhiyao S, Tingting W, Fumin X, Ruijie L (2008) A simple formula for predicting settling velocity of sediment particles. Water Sci Eng 1(1):37–43
Zhong D, Wang G, Sun Q (2011) Transport equation for suspended sediment based on two-fluid model of solid/liquid two-phase flows. J Hydraul Eng 137(5):530–542
Zyserman JA, Fredsøe J (1994) Data analysis of bed concentration of suspended sediment. J Hydraul Eng 120(9):1021–1042
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Pal, D., Ghoshal, K. Effect of particle concentration on sediment and turbulent diffusion coefficients in open-channel turbulent flow. Environ Earth Sci 75, 1245 (2016). https://doi.org/10.1007/s12665-016-6045-z
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DOI: https://doi.org/10.1007/s12665-016-6045-z