한국해양공학회지 (Journal of Ocean Engineering and Technology)

  • 제36권1호
  • /
  • Pages.11-20
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  • 2022
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  • 1225-0767(pISSN)
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  • 2287-6715(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
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Numerical Analyses on the Formation, Propagation, and Deformation of Landslide Tsunami Using LS-DYNA and NWT

  • Seo, Minjang (Graduate Student, Department of Ocean Civil Engineering, Gyeongsang National University) ;
  • Yeom, Gyeong-Seon (General Manager, Civil Zero Defect Team, Civil Business Division, DL E&C) ;
  • Lee, Changmin (Graduate Student, Department of Ocean Civil Engineering, Gyeongsang National University) ;
  • Lee, Woo-Dong (Department of Ocean Civil Engineering, Gyeongsang National University)
  • 투고 : 2021.11.25
  • 심사 : 2022.01.17
  • 발행 : 2022.02.28
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초록

Generally, tsunamis are generated by the rapid crustal movements of the ocean floor. Other factors of tsunami generation include landslides on coastal and ocean floor slopes, glacier collapses, and meteorite collisions. In this study, two numerical analyses were conducted to examine the formation, propagation, and deformation properties of landslide tsunamis. First, LS-DYNA was adopted to simulate the formation and propagation processes of tsunamis generated by dropping rigid bodies. The generated tsunamis had smaller wave heights and wider waveforms during their propagation, and their waveforms and flow velocities resembled those of theoretical solitary waves after a certain distance. Second, after the formation of the landslide tsunami, a tsunami based on the solitary wave approximation theory was generated in a numerical wave tank (NWT) with a computational domain that considered the stability/steady phase. The comparison of two numerical analysis results over a certain distance indicated that the waveform and flow velocity were approximately equal, and the maximum wave pressures acting on the upright wall also exhibited similar distributions. Therefore, an effective numerical model such as LS-DYNA was necessary to analyze the formation and initial deformations of the landslide tsunami, while an NWT with the wave generation method based on the solitary wave approximation theory was sufficient above a certain distance.

키워드

과제정보

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. NRF-2021R1A2C4002665).

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