Reduction of non-breaking wave loads on caisson type breakwaters using a modified perforated configuration

Kırca V. Ş. Ö., Kabdasli M. S.

OCEAN ENGINEERING, vol.36, pp.1316-1331, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 36
  • Publication Date: 2009
  • Doi Number: 10.1016/j.oceaneng.2009.09.003
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1316-1331
  • Keywords: Vertical faced breakwater, Perforated caisson, Wave load reduction, Physical modelling, WALL BREAKWATER, INFINITE NUMBER, OBLIQUE WAVES, FORCES, REFLECTION
  • Istanbul Technical University Affiliated: No


In this study a new type of partially perforated caisson breakwater is introduced with two shallow chambers split horizontally by an impermeable plate at the mean sea level. A plexiglass laboratory model of the structure was manufactured with different frontface perforation ratios and adjustable chamber breadths, then tested under 2D non-breaking regular and irregular waves. The horizontal wave force and wave moment are evaluated as dimensionless parameters from measured pressure-time series. A control group of tests was also conducted with plain vertical face under identical waves, also the wave loads on a vertical face for the same wave properties were computed using Goda (1985) formulation. Results show that the dimensionless wave forces and dimensionless wave moments can be reduced by a ratio up to 35%-40% under regular and irregular waves and structure performance increases with decreasing wave length. The obtained results are also compared with reference to a fully perforated (Jarlan) caisson using the method given by Tabet-Aoul and Lambert (2003) and a general harmony was seen both for the magnitudes and variation of wave loads with dimensionless chamber breadth (B/L). (C) 2009 Elsevier Ltd. All rights reserved.