Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Effects of Tsunami Waveform on Energy Dissipation of Aquatic Vegetation

쓰나미 파형이 수중식생의 에너지소산에 미치는 영향

  • Lee, Woo-Dong (Institute of Marine Industry, Gyeongsang National University) ;
  • Park, Jong-Ryul (Earthquake Hazard Research Division, National Disaster Management Research Institute) ;
  • Jeon, Ho-Seong (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Hur, Dong-Soo (Department of Ocean Civil Engineering, Gyeongsang National University)
  • 이우동 (국립경상대학교 해양산업연구소) ;
  • 박종률 (국립재난안전연구원 지진대책연구실) ;
  • 전호성 (한국건설기술연구원 수자원 하천연구소) ;
  • 허동수 (국립경상대학교 해양토목공학과)
  • Received : 2017.01.25
  • Accepted : 2017.04.20
  • Published : 2017.04.30
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Abstract

The present study numerically investigated the influence of the waveform distribution on the tsunami-vegetation interaction using a non-reflected wave generation system for various tsunami waveforms in a two-dimensional numerical wave tank. First, it was possible to determine the wave attenuation mechanism due to the tsunami-vegetation interaction from the spatial waveform, flow field, vorticity field, and wave height distribution. The combination of fluid resistance in the vegetation and a large gap and creates a vortex according to the flow velocity difference in and out of the vegetation zone. Thus, the energy of a tsunami was increasingly reduced, resulting in a gradual reduction in wave height. Compared to existing approximation theories, the double volumetric ratio of the waveform increased the reflection coefficient of the tsunami-vegetation interaction by 34%, while decreasing the transfer coefficient and energy attenuation coefficient by 25% and 13%, respectively. Therefore, the hydraulic characteristics of a tsunami is highly likely to be underestimated if the solitary wave of the approximation theory is applied for the tsunami.

Keywords

References

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