Hydrodynamic performance of floating breakwaters in long wave regime: an experimental study

Chunyan Ji, Yong Cheng, Jie Cui, Zhiming Yuan, Oleg Gaidai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Hydrodynamic behavior test of long water waves with a floating breakwater is an important mission in some near-reef sea areas. Especially, the performance of the floating breakwater becomes more complicated when its natural periods stay within the range of wave frequencies. In this study, a series of experiments were conducted under long regular wave actions to investigate the hydrodynamic behavior of four slack-moored floating breakwater models, including single box, single porous box, double cylindrical pontoon, double cylindrical pontoon with mesh cage and suspending balls. The experimental results revealed that the wave transmission and wave energy dissipation for four models had multiple turning points near the natural periods of floating structures in long wave regime, while which was not evident for the reflection coefficient. The resonant responses were also observed in the motions and mooring tensions of the four models, which further explained the turning point phenomenon that appeared in transmission and dissipation coefficients. The overall results demonstrated that the porous plates and mesh cage with balls were effective for mitigating the turning point phenomenon due to additional water mass and damping effects, and also held the potential for reducing the motions and mooring forces.
LanguageEnglish
Pages154-166
Number of pages13
JournalOcean Engineering
Volume152
Early online date23 Feb 2018
DOIs
Publication statusPublished - 15 Mar 2018

Fingerprint

Floating breakwaters
Hydrodynamics
Pontoons
Mooring
Porous plates
Reefs
Wave transmission
Water waves
Energy dissipation
Damping
Water
Experiments

Keywords

  • floating breakwater
  • model experiments
  • long waves
  • mesh cage with balls
  • porous plates

Cite this

Ji, Chunyan ; Cheng, Yong ; Cui, Jie ; Yuan, Zhiming ; Gaidai, Oleg. / Hydrodynamic performance of floating breakwaters in long wave regime : an experimental study. In: Ocean Engineering. 2018 ; Vol. 152. pp. 154-166.
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abstract = "Hydrodynamic behavior test of long water waves with a floating breakwater is an important mission in some near-reef sea areas. Especially, the performance of the floating breakwater becomes more complicated when its natural periods stay within the range of wave frequencies. In this study, a series of experiments were conducted under long regular wave actions to investigate the hydrodynamic behavior of four slack-moored floating breakwater models, including single box, single porous box, double cylindrical pontoon, double cylindrical pontoon with mesh cage and suspending balls. The experimental results revealed that the wave transmission and wave energy dissipation for four models had multiple turning points near the natural periods of floating structures in long wave regime, while which was not evident for the reflection coefficient. The resonant responses were also observed in the motions and mooring tensions of the four models, which further explained the turning point phenomenon that appeared in transmission and dissipation coefficients. The overall results demonstrated that the porous plates and mesh cage with balls were effective for mitigating the turning point phenomenon due to additional water mass and damping effects, and also held the potential for reducing the motions and mooring forces.",
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Hydrodynamic performance of floating breakwaters in long wave regime : an experimental study. / Ji, Chunyan; Cheng, Yong; Cui, Jie; Yuan, Zhiming; Gaidai, Oleg.

In: Ocean Engineering, Vol. 152, 15.03.2018, p. 154-166.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hydrodynamic performance of floating breakwaters in long wave regime

T2 - Ocean Engineering

AU - Ji, Chunyan

AU - Cheng, Yong

AU - Cui, Jie

AU - Yuan, Zhiming

AU - Gaidai, Oleg

PY - 2018/3/15

Y1 - 2018/3/15

N2 - Hydrodynamic behavior test of long water waves with a floating breakwater is an important mission in some near-reef sea areas. Especially, the performance of the floating breakwater becomes more complicated when its natural periods stay within the range of wave frequencies. In this study, a series of experiments were conducted under long regular wave actions to investigate the hydrodynamic behavior of four slack-moored floating breakwater models, including single box, single porous box, double cylindrical pontoon, double cylindrical pontoon with mesh cage and suspending balls. The experimental results revealed that the wave transmission and wave energy dissipation for four models had multiple turning points near the natural periods of floating structures in long wave regime, while which was not evident for the reflection coefficient. The resonant responses were also observed in the motions and mooring tensions of the four models, which further explained the turning point phenomenon that appeared in transmission and dissipation coefficients. The overall results demonstrated that the porous plates and mesh cage with balls were effective for mitigating the turning point phenomenon due to additional water mass and damping effects, and also held the potential for reducing the motions and mooring forces.

AB - Hydrodynamic behavior test of long water waves with a floating breakwater is an important mission in some near-reef sea areas. Especially, the performance of the floating breakwater becomes more complicated when its natural periods stay within the range of wave frequencies. In this study, a series of experiments were conducted under long regular wave actions to investigate the hydrodynamic behavior of four slack-moored floating breakwater models, including single box, single porous box, double cylindrical pontoon, double cylindrical pontoon with mesh cage and suspending balls. The experimental results revealed that the wave transmission and wave energy dissipation for four models had multiple turning points near the natural periods of floating structures in long wave regime, while which was not evident for the reflection coefficient. The resonant responses were also observed in the motions and mooring tensions of the four models, which further explained the turning point phenomenon that appeared in transmission and dissipation coefficients. The overall results demonstrated that the porous plates and mesh cage with balls were effective for mitigating the turning point phenomenon due to additional water mass and damping effects, and also held the potential for reducing the motions and mooring forces.

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