William Veale, Tomohiro Suzuki, Toon Verwaest, Koen Trouw, Tina Mertens


Wave overtopping tests were performed with a 1:25 physical scale model to determine the optimal geometry for design of new wave return walls at Wenduine, Belgium. Wave overtopping on the shallow foreshore at Wenduine was found to be dominated by low-frequency infragravity waves (f < 0.04 Hz at prototype scale). Mean wave overtopping discharge measured with the physical model compared well with the Van Gent (1999) empirical overtopping equations for shallow foreshores. Physical model tests confirmed that the stilling wave basin concept proposed by Geerearts, et al. (2006) and wave wall parapet concepts of van Doorslaer & De Rouck (2010) were effective at reducing the wave wall height required to meet the tolerable discharge overtopping standards.


wave overtopping; stilling wave basin; shallow foreshore; infragravity waves

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Alsina, J. and Cáceres, I., 2011. Sediment suspension events in the inner surf and swash zone. Measurements in large-scale and high energy wave conditions (Abstract). Coastal Engineering, Vol. 58, pp. 657-670

Afdeling Kust 2011. Coastal Safety Masterplan [Masterplan Kustveiligheid in Dutch] [Online]. Available:

Geeraerts, J.; De Rouck J. et al., 2006. Reduction of Wave Overtopping at Seadikes: Stilling Wave Basin (SWB). Proceedings of 30th International Conference on Coastal Engineering, ASCE, 4680-4691.

Goda, Y. 2000. Random Seas and Design of Maritime Structures. Advanced Series on Ocean Engineering. World Scientific.


Mansard, E. P. D., Funke, E. R. 1980. The measurement of incident and reflected spectra using a least squares method. Proceedings of 17th International Conference on Coastal Engineering, ASCE, 154–172.

Mertens, T., DeWolf P., Verwaest T., Trouw K., De Nocker L., Couderé K. 2008. An Integrated Master Plan for Flanders Future Coastal Safety, Proceedings of the 31st International Conference on Coastal Engineering 2008, ASCE, 4017 - 4028.

Pullen, T., Allsop, W., Bruce, T., Kortenhaus, A., Schuttrumpf, H & van der Meer, J. 2007. Wave overtopping of sea defences and related structures: Assessment Manual. [Online] Available:

Steetzel H.J. 1993. Cross shore transport during storm surges. PhD Thesis, Delft University of Technology.

Van der Biest, K.; Verwaest, T.; Reyns, J.; Mostaert, F. 2009. CLIMAR: Deelrapport 2 - Kwantificatie van de secundaire gevolgen van de klimaatsverandering in de Belgische kustvlakte [in Dutch]. Flanders Hydraulics Research Report No.814_01.

Van Doorslaer K., De Rouck J., (2010): Reduction of wave overtopping on a smooth dike by means of a parapet. Proceedings of 32nd International Conference on Coastal Engineering, ASCE, 1-15.

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.

Veale, W., Suzuki, T., Spiesschaert, T.,Verwaest, T. and Mostaert, F. 2011. SUSCOD Pilot 1: Wenduine Wave Overtopping Scale Model: Interim Results Report. Version 2_0. Flanders Hydraulics Research Report No.WL2011R75902a_1rev2_0. Verwaest, T., Van Poucke, Ph., Vanderkimpen, P., Van der Biest, K., Reyns, J., Peeters, P., Kellens

W., Vanneuville, W., Mostaert, F. 2008. Overstromingsrisico's aan de Vlaamse kus [In Dutch]t. Evaluatie van de zeeweing. Deel 1: Methodologie. Flanders Hydraulics Research Report, 718/2A.

Waverboukundig Laboratorium & Universiteit Gent & Soresma-Haecon 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, 2011.