Koen Jacobus Martha Trouw, Nicolas Zimmermann, Mieke Mathys, Rosalia Delgado, Dano Roelvink


A comparison between two very different numerical models is presented: Delft3D and XBeach. Delft3D (Deltares) calculates non-steady flow and transport phenomena that result from tidal and meteorological forcing. The wave propagation is calculated in the frequency domain. XBeach (Unesco-IHE, Delft University and Deltares) consists of formulations for short wave envelope propagation (time-dependent wave action balance), non-stationary shallow water equations, sediment transport and bed update. The model is able to resolve the time dependent long waves, which are important in the surf zone. A number of simplified cases are defined beforehand taking into account actual features and conditions existing in chosen problem areas. The examination of these simplified cases allows for the identification of driving processes and the assessment of the sensitivity to certain relevant parameters, with the advantage of working in scenarios of limited complexity and without excessive computational load.


morphological modeling; XBeach; Delft3D; beach dynamics

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Booij, N., R.C. Ris and L.H. Holthuijsen. 1999. A third-generation wave model for coastal regions, Part I, Model description and validation, J. Geophys. Res. C4, 104, 7649-7666.

Brière, C. and Walstra, D.J. (2006). Modelling of bar dynamics. WL Delft Hydraulics report, project Z4099.00, prepared for Rijskwaterstaat – RIKZ, The Netherlands.

Deltares 2010a. Delft3D-FLOW. Simulation of multi-dimensional hydrodynamic flow and transport phenomena, including sediments – User Manual. Version 3.04, rev. 11114. Deltares, Delft, The Netherlands.

Deltares 2010b. Delft3D-WAVE. Simulation of short-crested waves with SWAN – User Manual. Version 3.04, rev. 11114. Deltares, Delft, The Netherlands.

De Vriend, H.J., Zyserman, J., Nicholson, J, Roelvink, J.A., Pechon, P., and Southgate, H.N. (1993). Medium-term 2DH coastal area modelling. Coastal Engineering, 21, pp. 193-224.

Grasmeijer, B. 2002. Process-based cross-shore modelling of barred beaches. PhD thesis, pp.251, University of Utrecht, The Netherlands.

Holthuijsen, L., Booij, N. and Herbers, T. 1989. A prediction model for stationary, short-crested waves in shallow water with ambient currents, Coastal Eng., 13, pp. 23{54.

Lesser, G.R. (2009). An approach to medium-term coastal morphological modeling. PhD dissertation, Unesco-IHE Institute for Water Education and Delft University of Technology, The Netherlands.

Reniers, A.J.H.M., E.B. Thornton, T. Stanton and J.A. Roelvink. 2004. Vertical flow structure during Sandy Duck: Observations and Modeling. Coastal Engineering, Volume 51, Issue 3, May 2004, Pages 237-260

Ris, R.C. 1997. Spectral Modelling of Wind Waves in Coastal Areas (Ph.D. Dissertation Delft University of Technology), Communications on Hydraulic and Geotechnical Engineering, Report No. 97-4, Delft.

Roelvink, J.A. 1993. Dissipation in random wave groups incident on a beach. Coastal Eng., 19 pp. 127-150. 277-287.

Roelvink J.A. (2006). Coastal morphodynamic evolution techniques. Coastal Engineering, vol. 53, pp

Roelvink, D., Reniers, A., van Dongeren, A., van Thiel de Vries, J., Lescinsky, J. and McCall, R. (2009). Modelling storm impacts on beaches, dunes and barrier islands. Coastal Engineering, vol. 56, pp. 1133-1152.

Ruessink, B.G., Kuriyama, Y., Reniers, A.J.H.M., Roelvink, J.A., and Walstra, D.J.R. 2007. Modeling cross-shore sandbar behavior on the timescale of weeks. J. Geophys. Res., 112, F03010.

Soulsby, R.L. 1997. Dynamics of marine sands : a manual for practical applications. Thomas Telford Publications, 249 p.


Van Rijn, L.C. 1993. Principles of Sediment Transport in Rivers, Estuaries and Coastal Seas. Aqua Publications, Amsterdam, The Netherlands.


Unesco-IHE, Deltares, TU Delft. 2009. XBeach model description and manual. Report Z4175

Walstra, D.J.R., Reniers, A.J.H.M., Ranasinghe, R., Roelvink, J.A., and Ruessink, B.G. 2012. On bar growth and decay during interannual net offshore migration, Coastal Engineering Volume 60,

Zimmermann, N.; Mathys, M.; Trouw, K.; Delgado, R.; Verwaest, T.; Mostaert, F. 2012. Scientific support regarding hydrodynamics and sand transport in the coastal zone: Simplified Blankenberge case: comparison of Delft3D and XBeach model results. Version 2_0. WL Rapporten, 744_30. Flanders Hydraulics Research & IMDC: Antwerp, Belgium.