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2018 Vol.51, Issue 8 Preview Page

Research Article

Effects of tsunami waveform on overtopping and inundation on a vertical seawall

직립호안에서 지진해일 파형이 월파와 침수에 미치는 영향

Woodong Leea
,
Jungouk Kima
,
Jongryul Parkb
,
Dongsoo Hura*
이 우동a
,
김 정욱a
,
박 종률b
,
허 동수a*
aDepartment of Ocean Civil Engineering, Gyeongsang National University
bEarthquake Hazard Research Division, National Disaster Management Research Institute
a경상대학교 해양토목공학과
b국립재난안전연구원 지진대책연구실
* Corresponding Author
31 August 2018. pp. 643-654
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Abstract

In order to generate the stable tsunami in a numerical wave tank, a two-dimensional numerical model, LES-WASS-2D has been introduced the non-reflected wave generation system for various tsunami waveforms. And then, comparing to existing experimental results it is revealed that computed results of the LES-WASS-2D are in good agreement with the experimental results on spatial and temporal tsunami waveforms in the vicinity of a seawall. It is shown that the applied model in this study is applicable to the numerical simulations on tsunami overtopping and inundation. Using the numerical results, the characteristics of overtopping and inundation on a seawall are also discussed with volume ratio of tsunami and relative tsunami height. The wider the tsunami waveform, tsunami overtopping quantity and inundation distances are linearly increased. Therefore, the hydraulic characteristics is highly likely to be underestimated against the real tsunami if the solitary wave of approximation theory is applied for the overtopping/inundation simulations due to a tsunami.

Keywords
Tsunami
Solitary wave
Overtopping
Inundation
Numerical wave tank

수치파동수조에서 안정적인 지진해일을 조파하기 위하여 2차원 수치모델(LES-WASS-2D)에 다양한 파형의 지진해일을 고려할 수 있는 무반사 조파시스템을 도입하였다. 기존 실험에서 측정한 호안주변의 지진해일의 시 ․ 공간 파형들과 비교하여 수치계산결과가 높은 정확도를 나타내었다. 이로써 본 연구에서 적용한 수치모델이 지진해일 월파모의에 있어서 적합하다는 것을 보여주었다. 지진해일 월파모의결과로부터 지진해일 체적비와 파고와 수심비에 따른 월퍄량, 침수거리를 고찰하였다. 지진해일의 파형이 넓을수록 월파량이 선형적으로 증가하였으며, 침수거리 또한 증가하였다. 그러므로 고립파 근사이론을 지진해일의 월파 및 침수모의에 적용할 경우, 실제 지진해일보다 수리특성이 과소평가 될 우려가 크다.

키워드
지진해일
고립파
고립파
월파
침수
수치파동수조
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 51
  • No :8
  • Pages :643-654
  • Received Date : 2018-04-10
  • Revised Date : 2018-05-08
  • Accepted Date : 2018-05-08
  • DOI :https://doi.org/10.3741/JKWRA.2018.51.8.643
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