APPLICATION OF A NEW SAND TRANSPORT FORMULA WITHIN THE CROSS-SHORE MORPHODYNAMIC MODEL UNIBEST-TC

Jebbe van der Werf, Harm Nomden, Jan Ribberink, Dirk-Jan Walstra, Wouter Kranenburg

Abstract


In this paper, we have implemented and tested the new SANTOSS sand transport formula with the cross-shore morphodynamic model UNIBEST-TC using data from the LIP and Grasso wave flume experiments. It is shown that the total net sand transport is a delicate balance between wave- and current-related transport in the wave boundary layer (which can be on- or offshore-directed) and offshore-directed current-related suspended load above it. The change from onshore to offshore net transport for the two Grasso cases was reproduced by the SANTOSS model and seems to be due to the increasing importance of phase-lags between intra-wave velocities and sand concentrations. More generally, measured net sand transport rates are reasonably well reproduced by the SANTOSS formula outside the surf zone if orbital velocities and ripple heights are predicted correctly and phase-lags between velocities and suspended sand concentrations are accounted for.

Keywords


morphodynamic modeling; sand transport; sand transport formulas; wave flume experiments; waves

References


Abreu, T., Silva, P.A., Sancho, F., and A. Temperville, 2010. Analytical approximate wave form for asymmetric waves. Coastal Engineering, 57(7), 656-667.http://dx.doi.org/10.1016/j.coastaleng.2010.02.005

Grasso, F., Michallet, H., and E. Barthélemy, 2011. Sediment transport associated with morphological beach changes forced by irregular asymmetric, skewed waves. Journal of Geophysical Research, Vol. 116, C03020.http://dx.doi.org/10.1029/2010JC006550

Michallet, H, Cienfuegos, R., Barthélemy, E, and F. Grasso, 2011. Kinematics of waves propagating and breaking on a barred beach. European Journal of Mechanics - B/Fluids, 30(6), 624-634http://dx.doi.org/10.1016/j.euromechflu.2010.12.004

Nomden, H.G., 2011. SANTOSS sand transport model: Implementing and testing within the morphological model UNIBEST-TC. M.Sc. thesis, University of Twente, The Netherlands.

O'Donoghue, T., Doucette, J.S., Van der Werf, J. J. and J.S. Ribberink, 2006. The dimensions of sand ripples in full-scale oscillatory flows. Coastal Engineering, 53(12), 997-1012.http://dx.doi.org/10.1016/j.coastaleng.2006.06.008

Ribberink, J. S., Van der Werf, J. J., O'Donoghue, T., and W.N.M. Hassan, 2008. Sand motion induced by oscillatory flow: Sheet flow and vortex ripples. Journal of Turbulence, 9(20), 1-32.

Roelvink, J.A., and A.J.H.M. Reniers, 1995. LIP 11D Delta Flume experiments, A data set for profile model validation. Report H2130, Delft Hydraulics, The Netherlands.

Ruessink, B.G., Ramaekers, G. and L.C. van Rijn, 2012. On the parameterization of the free-stream non-linear wave orbital motion in nearshore morphodynamic models. Coastal Engineering, 65, 56-63http://dx.doi.org/10.1016/j.coastaleng.2012.03.006

Ruessink, B.G., Kuriyama, Y., Reniers, A.J.H.M. Roelvink, J.A., and D.J.R. Walstra, 2007. Modeling cross-shore sandbar behaviour on the timescale of weeks. Journal of Geophysical Research, 112, F03010.http://dx.doi.org/10.1029/2006JF000730

Sleath, J.F.A., 1987. Turbulent oscillatory flow over rough beds. Journal of Fluid Mechanics, 182, 369-409.http://dx.doi.org/10.1017/S0022112087002374

Van der A, D., Ribberink, J., Van der Werf, J., and T. O'Donoghue, 2010. New practical model for sand transport induced by non-breaking waves and currents. Proceedings of 30th International Conference on Coastal Engineering, Shanghai, China.

Van der Werf, J.J., 2006. Sand transport over rippled beds in oscillatory flow. Ph.D thesis, University of Twente, The Netherlands.

Van Rijn, L.C., 2007a. Unified View of Sediment Transport by Currents and Waves, I: Initiation of Motion, Bed Roughness, and Bed-Load Transport. Journal of Hydraulic Engineering, 133(6): 649-667.http://dx.doi.org/10.1061/(ASCE)0733-9429(2007)133:6(649)

Van Rijn, L.C., 2007b. Unified View of Sediment Transport by Currents and Waves, II: Suspended Transport. Journal of Hydraulic Engineering, 133(6): 668-689.http://dx.doi.org/10.1061/(ASCE)0733-9429(2007)133:6(668)

Van Rijn, L.C., Tonnon, P.K. and D.J.R. Walstra, 2011. Numerical modelling of erosion and accretion of plane sloping beaches at different scales. Coastal Engineering, 58, 637-655.http://dx.doi.org/10.1016/j.coastaleng.2011.01.009


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