Science China Technological Sciences

, Volume 61, Issue 5, pp 711–723 | Cite as

Experimental study of mean overtopping discharge at perforated caissons for non-impulsive waves

  • Xiao Liu
  • Yong Liu
  • HuaJun Li
  • XinYu Wang
  • Yang Zhao


In this study, hydraulic model tests are carried out to investigate the mean overtopping discharge at perforated caisson breakwaters for non-impulsive waves. Based on the experimental data, the mean overtopping discharges of perforated and non-perforated caissons are compared. It is found that when the relative crest freeboard is smaller than 1.6, the mean overtopping discharge of a breakwater can be reduced by at least half by using perforated caissons with 35% porosity instead of non-perforated caissons. The effects of the relative crest freeboard, the caisson porosity and perforation shape, the relative wave chamber width and the relative water depth on the mean overtopping discharge at perforated caissons are clarified. Then, predictive formulas for the mean overtopping discharge at perforated caissons are developed. The predictive formulas based on the experimental data are valid in a wide range of the relative crest freeboard and involve the effects of the caisson porosity and the relative water depth. The predictive formulas developed in this study are of significance for the hydraulic design of perforated caissons.


perforated caissons experimental tests mean overtopping discharge predictive formula 


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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiao Liu
    • 1
  • Yong Liu
    • 1
  • HuaJun Li
    • 1
  • XinYu Wang
    • 1
  • Yang Zhao
    • 1
  1. 1.Shandong Provincial Key Laboratory of Ocean EngineeringOcean University of ChinaQingdaoChina

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