J Shanghai Jiaotong Univ Sci ›› 2022, Vol. 27 ›› Issue (3): 316-325.doi: 10.1007/s12204-022-2444-3

• Naval Architecture and Ocean Engineering • Previous Articles     Next Articles

Hydrodynamic Performance of Air-Filled Wave Attenuator for Wave Control: Experimental Study

PEREIRA Eric Joseph1 (佩雷拉·埃里克·约瑟夫), TEH Hee-Min1,2∗ (郑希铭), MA Zhe3 (马 哲)   

  1. (1. Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia; 2. Centre of Urban Resource Sustainability, Institute of Self-Sustainable Building, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia; 3. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China)
  • Received:2021-05-13 Online:2022-05-28 Published:2022-06-23

Abstract: Numerous types of floating breakwaters have been proposed, tested and commercialized in the past decades. The majority of these breakwaters are made of solid bodies; hence, they are relatively bulky and are not readily to be rapidly installed at the targeted sites when immediate wave protection of the coastal and offshore facilities is needed. Furthermore, the application of these hard floating structures at the recreational beaches is rather unlikely due to potential deadly marine traffic collision. To overcome these problems, a flexible air-filled wave attenuator (AFWA) has been developed in the present study. This floating breakwater is made of flexible waterproof membrane materials. The main body consists of a rectangular air-filled prism and is ballasted by sandbags located around the floating module. The objective of this study is to evaluate the wave transmission, wave reflection, energy dissipation, motion responses and mooring forces of the AFWA under the random wave actions using physical modelling. The test model located in a 20 m long wave flume was subjected to a range of wave heights and periods. The wave profiles in the vicinity of the test model were measured using wave probes for determination of wave transmission, reflection and energy loss coefficients. The motion responses in terms of heave, surge and pitch, and wave forces acting on the mooring lines were measured using a motion tracking system and load cells, respectively. The experimental results reveal that the AFWA is effective in attenuating up to 95% in the incoming wave height and has low-wave-reflection properties, which is commendable for floating breakwaters.

Key words: floating breakwater, air-filled wave attenuator (AFWA), hydrodynamic performance, wave attenua tion, motion responses, mooring forces

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