WAVE DIFFRACTION AND TRANSMISSION BY A SUBMERGED BREAKWATER

  • Pasquale G. Fabio Filianoti
  • Luana Gurnari

Abstract

The wave field around a rectangular submerged breakwater is investigated by means of an experiment in numerical wave flume. The results were compared with those obtained making use of the Boundary Element Method. The numerical experiment is carried out to determine the share of the incident wave energy that are reflected, dissipated over the roof of the breakwater, and transmitted in the lee. The wave field before the breakwater (i.e. the quasi standing field) obtained with the CFD simulations is quite similar to that obtained with the BEM. Some relevant differences between the two models arise in the lee of the breakwater, because the wave motion is strongly affected by the dissipation occuring over the breakwater roof by friction and wave breaking. They cannot be foreseen with BEM, being the motion ideal. Their analysis show that the dissipation is more than halves the transmission of energy, despite the relevant submergence of the considerated breakwater.

References

Ahrens JP (1987). Characteristics of reef breakwaters. Tech. Rep. CERC-87-17, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

Arena, F. & Filianoti, P. (2007) A small-scale field experiment on a submerged breakwater for absorbing wave energy, ASCE Journal of Waterway, Port, Coastal, and Ocean Engineering, Volume 133, Issue 2, pp. 161-167, doi:10.1061/(ASCE)0733-950X (2007)133:2(161);

Boccotti P. (2003), On a new wave energy absorbe. Ocean Engineering, 30, 1191-2000, 2003.

Boccotti P. (2007), Caisson breakwaters embodying an OWC with a small opening - Part I: Theory. Ocean Engineering, 34 (5-6), 806-819.

Boccotti P. (2007), P. Filianoti, V. Fiamma, F. Arena, Caisson breakwaters embodying an OWC with a small opening Engineering, 34 (5-6), 820-841.

Briganti R., JW Van der Meer, M. Buccino, M. Calabrese (2003), Wave transmission behind low crested structures. ASCE Proc. Coastal Structures, Portland, 580-592

Chakrabarti, S. K. 1994. Hydrodynamics of Offshore Structures, Southampton: Computational Mechanics Publications.

D'Angremond K, J. Van Der Meer, R. De Jong, (1996). Wave transmission at low-crested structures. Proceedings 25th Coastal Engineering Conference, ASCE, 2418-2427.

Filianoti P. (2015), R. Piscopo, Sea wave energy transmission behind submerged absorber caissons. Ocean Engineering, 93, 107-117.

G. Ponti et al.,The role of medium size facilities in the HPC ecosystem: the case of the new CRESCO4 cluster integrated in the ENEAGRID infrastructure, Proceedings of the 2014 International Conference on High Performance Computing and Simulation, HPCS 2014, art. no. 6903807, 1030-1033;

Healy, J.J., (1952). Wave damping effect of beaches. Proc. Int. Hydraulics Convention, 213-220

Seabrook S., KR Hall (1998), Wave transmission at submerged rubble mound breakwaters. Coastal Engineering, 2000-2013.

Wehausen, and Laitone Surface waves Handbuch der Physik (Ed.), S. Flugge, IX, Springer-Verlag, Berlin (1960), pp. 446-778

Published
2018-12-30
How to Cite
Filianoti, P. G. F., & Gurnari, L. (2018). WAVE DIFFRACTION AND TRANSMISSION BY A SUBMERGED BREAKWATER. Coastal Engineering Proceedings, 1(36), papers.27. https://doi.org/10.9753/icce.v36.papers.27