WAVES OVERTOPPING A WIDE-CRESTED DIKE

Toon Verwaest, Philippe Vanpoucke, Marc Willems, Tom De Mulder

Abstract


If a coastal dike has a crest width of more than say a few meters, then wave overtopping will be significantly reduced due to the crest width, because kinetic energy can be dissipated on the crest and water on the crest can flow back towards the seaside. In coastal towns built on dune belts often a wide-crested coastal dike was constructed as both coastal protection and sea promenade. However, quantifying the effect of such a wide crest on wave overtopping is not straightforward because no empirical overtopping formulas are given in literature for this kind of configuration. Therefore physical scale model research was carried out. Also a simplified theoretical model concept was used based on an energy balance formulation of a single overtopping wave. Combining the scale model measurements with the theoretical model, a semi-empirical formula was developed and calibrated.

Keywords


overtopping; dike; wide-crested

References


EurOtop manual. 2007. Wave Overtopping of Sea Defences and Related Structures: Assessment Manual, www.overtopping-manual.com

Gioia, G., and F.A. Bombardelli. 2002. Scaling and similarity in rough channel flows, Physical review letters, volume 88, number 1.

Schüttrumpf, H. 2001. Wellenüberlaufströmung bei Seedeichen -Experimentelle und theoretische Untersuchungen-, Technischen Universität Braunschweig, PhD thesis.

van Gent, M. 1999. Physical model investigations on coastal structures with shallow foreshores; 2D model tests with single and double-peaked wave energy spectra, WL Delft Hydraulics.


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