TWO-DIMENSIONAL WAVE OVERTOPPING CALCULATION OVER A DIKE IN SHALLOW FORESHORE BY SWASH

Tomohiro Suzuki, Corrado Altomare, Toon Verwaest, Koen Trouw, Marcel Zijlema

Abstract


In this paper, a numerical wave-flow model SWASH, based on non-linear shallow water equation with non- hydrostatic pressure, is applied to the estimation of wave overtopping over a dike in shallow foreshores. First sensitivity analysis is conducted to see the influence of wave generation, grid size, time window and bottom friction by one-dimensional calculations. After that the SWASH model is validated by comparing results from field measurements in Petten dike in the Netherlands. Due to the stability of the computation, the desired calculation could not be achieved, but an alternative way to calculate wave overtopping including two-dimensional effects is proposed.

Keywords


SWASH model; wave overtopping; directional spreading; free long waves; shallow foreshores

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References


Barthel, V., Mansard, E. P. D., Sand, S. E. and Vis, F. C. (1983). Group bounded long waves in physical models. Ocean Engng, Vol. 10, No. 4, pp. 261-294.

EurOtop. (2007) Wave Overtopping of Sea Defences and Related Structures: Assessment Manual, Environment Agency UK/Expertise Netwerk Waterkeren NL/Kuratorium fur Forschung im Kusteningenieurswesen DE. 2007.

Guza, R. T., and Feddersen, F. (2012). Effect of wave frequency and directional spread on shoreline runup. Geophysical Research Letters, 39(11).

Mase, H., Tamada, T., Yasuda, T., Hedges, T., and Reis, M. (2013). ”Wave Runup and Overtopping at Seawalls Built on Land and in Very Shallow Water.” J. Waterway, Port, Coastal, Ocean Eng., 139(5), 346–357.

Ottesen Hansen, N. E., Sand, S. E., Lundgren, H., Sorensen, T., Gravesen, H. (1980). Correct reproduction of group-induced long waves. Proceedings of the 17th Coastal Engineering Conference, ASCE, Vol 1: 784-800.

Rijnsdorp, D., Smit, P. B. and Zijlema, M. (2014) Non-hydrostatic modelling of infragravity waves under laboratory conditions. Coast. Engng., 85, 30-42.

Smit, P., Janssen, T., Holthuijsen, L. and Smith, J. (2014) Non-hydrostatic modeling of surf zone wave dynamics. Coastal Engineering 83: 36-48.

Suzuki, T., Verwaest, T., Hassan, W., Veale, W., Reyns, J., Trouw, K., Troch, P. and Zijlema, M. (2011) The applicability of SWASH for modelling wave transformation and wave overtopping: A case study for the Flemish coast. Proceedings in ACOMEN 2011.

Suzuki, T.; Gruwez, V.; Bolle, A.; Verwaest, T. (2012). Wave penetration into a shallow marina - case study for Blankenberge in Belgium, Book of abstracts of the 4th International Conference on the Application of Physical Modelling to Port and Coastal Protection - Coastlab12. Ghent University, Ghent, Belgium, September 17-20, 2012. pp. 135-136

Van Gent, M. R. A. (1999). Physical model investigations on coastal structures with shallow foreshore: 2D model tests with single and doube-peaked wave energy spectra. WL | Delft Hydrauilcs.

Williams, E., Briganti, R., Pullen, T. (2014). The role of offshore boundary conditions in the uncertainty of numerical prediction of wave overtopping using non-linear shallow water equations, Coastal Engineering, 89: 30-44.

Zijlema, M., Stelling, G.S. and Smit P. (2011) SWASH: An operational public domain code for simulating wave fields and rapidly varied flows in coastal waters. Coastal Engineering, 58: 992-1012.




DOI: https://doi.org/10.9753/icce.v34.structures.3