Abstract
In this paper, the results for sediment transport simulation around bridge abutments in a channel bend are presented. Computational Fluid Dynamics code FANS3D is used to conduct the study, which solves three-dimensional Reynolds- Averaged Navier-Stokes equations with the finite analytic scheme. The two-layer turbulence model, which combines the one- and two-equation eddy-viscosity models, is utilized to resolve turbulence near smooth solid surfaces. The wall- function approach is adopted to take into account the roughness effects in case of sediment beds. For velocity-pressure coupling, PISO/SIMPLER algorithms are used. Chimera technique is utilized to embed non-matching blocks in the computational domain. The numerical model coupled with the sediment transport module was validated with experimental studies. For the present case, the transport of suspended sediment in a 90°-channel bend with abutments located in the middle was simulated. Sediment plume in a swirl was observed downstream of the abutments.References
Briaud, J.L., Chen, H.C., Chang, K.A., Oh, S.J., Chen, X. (2009). Abutment scour in cohesive materials. NCHRP Report 24-15(2), Transportation Research Board, National Research Council, Washington, D.C., USA.
Cebeci, T., and Bradshaw, P. (1977). Momentum transfer in boundary layers. Hemisphere, Washington, D.C., USA
Chen, C.J., Bernatz, R., Carlson K.D., and Lin, W. (2000). Finite analytic method in flows and heat transfer. CRC Press, New York, NY, USA.
Chen, C.J., and Chen, H.C. (1984). Finite analytic numerical method for unsteady two-dimensional Navier-Stokes equations. Journal of Computational Physics, 53.
Chen, H.C. (2002). Numerical simulation of scour around complex piers in cohesive soil. First International Conference on Scour of Foundation, College Station, Texas, USA.
Chen, H.C., and Patel, V.C. (1988). Near-wall turbulence models for complex flows including separation. AIAA Journal, 26(6).
Chen, H.C., Patel, V.C., and Ju, S. (1990). Solutions of Reynolds-Averaged Navier-Stokes equations for three-dimensional incompressible flows. Journal of Computational Physics, 88.
Delft Hydraulics Laboratory. (1980). Computation of siltation in dredged trenches: Mathematical model. Report R 1267 V, Delft, The Netherlands.
Hjelmfelt, A.T., and Lenau, C.W. (1970) Non-equilibrium transport of suspended sediment. Journal of the Hydraulic Division, HY 7.
Khosronejad, A., Rennie, C.D., Salehi Neyshabouri, S.A.A., and Townsend, R.D. (2007). 3D numerical modeling of flow and sediment transport in laboratory channel bends. Journal of Hydraulic Engineering, 133(10).
Kraus, N.C., and Larson, M. (2002). Analytical model of navigation channel infilling by cross-channel transport. Proceeding of the 28th International Conference on Coastal Engineering. ASCE, Virginia, USA.
Miller, M. "Costly dredging needs loom over Wellfleet Harbor.† Provincetown Banner 6 Mar. 2013: Web <http://www.wickedlocal.com/wellfleet/news/x1433792079/Costly-dredging-needs-loom- over-Wellfleet-Harbor#axzz2QV5odiZa>
Prendergast, L.J., and Gavin, K. (2014). A review of bridge scour monitoring techniques. Journal of Rock Mechanics and Geotechnical Engineering, 6(2).
Rijn, L. C., van. (1981). The development of concentration profiles in a steady, uniform flow without initial sediment load. Report M1531, Part II, Delft Hydraulic Laboratory, Delft, The Netherlands.
Rijn, L. C., van. (1986). Mathematical modeling of suspended sediment in nonuniform flows. Journal of Hydraulic Engineering, 112(6).
Sánchez-Badorrey, E., Losada, M. A., and Rodero, J. (2008). Sediment transport patterns in front of reflective structures under wind wave-dominated conditions. Coastal Engineering, 55.
Wang, Z. B., and Ribberink, J. S. (1986). The validity of a depth-integrated model for suspended sediment transport, Journal of Hydraulic Research, 24(1).
Wu, W, Rodi, W., and Wenka, T. (2000). 3D numerical modeling of flow and sediment transport in open channels. Journal of Hydraulic Engineering, 126(1).