OBLIQUE WAVE TRANSMISSION THROUGH ROUGH IMPERMEABLE RUBBLE MOUND SUBMERGED BREAWATERS

Valérie Vanlishout, Henk Jan Verhagen, Peter Troch

Abstract


There is a growing interest in the application of submerged rubble mound breakwaters as coastal defence structures. As their defensive ability highly depends on the amount of wave energy remaining at their lee side, the accurate prediction of the energy in the lee of such structures is of utmost importance. Past experiments have shown that the behaviour of rough permeable rubble mound structures under oblique wave attack was found to be significantly different from that of smooth impermeable low crested structures. This behavioural difference has led to the research objective of this present study which is to investigate oblique wave transmission by rough impermeable rubble mound submerged breakwaters using 3D physical model tests. This study intentionally uncouples two parameters, being the permeability of the core and the roughness of the breakwater. Analysing the data of this study shows that the permeability of the core has no visible influence on the structure's behaviour with respect to the influence of oblique wave attack. The fully permeable rough rubble mound breakwater behaves analogous to the fully impermeable rough rubble mound breakwater.

Keywords


oblique wave transmission; submerged rubble mound breakwaters; physical 3D model

References


d'Angremond, K., Van der Meer, J. W., & de Jong, R. J. 1996. Wave transmission at low crested structures. Proceedings 25th International Conference on Coastal Engineering.

DELOS. 2002. Wave basin transmission tests: Internal report. http://www.delos.unibo.it/Docs/Deliverables/D31.pdf. EU Fifth Framework Programme 1998-2002 (Contract EVK3-CT-2000-00041).

EurOtop. 2007. Wave overtopping of sea defences and related structures: Assessment manual. http://www.overtopping-manual.com.

Hashimoto, N. 1997. Analysis of the directional wave spectrum from field data. Advances in Coastal and Ocean Engineering. World Scientific Publishing Co. Pte. Ltd., Singapore.

Holthuijsen, L. H. 2007. Waves in Oceanic and Coastal Waters. Cambridge University Press, New York. http://dx.doi.org/10.1017/CBO9780511618536

Johnson, D. 2007. DIWASP: DIrectional WAve SPectra toolbox version 1.3. http://www.metocean.co.nz/ software. MetOcean Solutions Ltd., New Zealand.

Kramer, M., Zanuttigh, B., Van der Meer, J. W., Vidal, C., & Gironella, F. X. 2005. Laboratory experiments on low-crested breakwaters. Journal of Coastal Engineering 52.

Pawka, S. S. 1983. Island shadows in wave directional spectra. Journal of Geophysical Research. http://dx.doi.org/10.1029/JC088iC04p02579

Van der Meer, J. W., Wang, B., Wolters, A., Zanuttigh, B., & Kramer, M. 2003. Oblique wave transmission over low-crested structures. Proceedings Coastal Structures 2003.

Van der Meer, J. W., Briganti, R., Zanuttigh, B., & Wang, B. 2005. Wave transmission and reflection at low-crested structures: Design formulae, oblique wave attack and spectral change. Journal of Coastal Engineering 52.

Vanlishout, V. 2008. Oblique wave transmission through rough impermeable rubble mound submerged breakwaters. Ghent University. http://repository.tudelft.nl/view/ir/uuid:5c812c5d-b618-449c-b26f-06c25e008d7b/

Zanuttigh, B., & Lamberti, A. 2002. Wave basin hydrodynamic tests: Internal report. http://www.delos.unibo.it/Docs/Deliverables/D31.pdf. EU Fifth Framework Programme 1998-2002 (Contract EVK3-CT-2000-00041).


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