Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Variation Characteristics of Irregular Wave Fields around 3-Dimensional Low-Crested-Breakwater

3차원 저마루구조물(LCS) 주변에서 불규칙파동장의 변동특성

  • Lee, Kwang-Ho (Dept. of Civil Eng., Catholic Kwandong University) ;
  • Lee, Jun Hyeong (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Jung, Uk Jin (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Kim, Do-Sam (Dept. of Civil Eng., Korea Maritime and Ocean University)
  • 이광호 (가톨릭관동대학교 토목공학과) ;
  • 이준형 (한국해양대학교 대학원 토목환경공학과) ;
  • 정욱진 (한국해양대학교 대학원 토목환경공학과) ;
  • 김도삼 (한국해양대학교 건설공학과)
  • Received : 2020.03.23
  • Accepted : 2020.04.23
  • Published : 2020.04.29
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Abstract

On the many coasts of South Korea, including the eastern side, it has been recently increasing the coastal disaster such as the severe coastal erosion and road damage swept away by the wave. As one of the alternatives to prevent the coastal disaster, it has been widely studied the coastal disaster reduction method by the Low-Crested Structure (LCS) in the many countries including several European countries. In this study, the olaFLow model is used to simulate the permeable LCS and wave field of the LCS through the three-dimensional irregular waves numerical analysis on the basis of the previous research. From the numerical analysis, it is evaluated the Hrms, nearshore current and time-averaged turbulent kinetic energy. In addition, the pattern of nearshore current and spatial distribution of time-averaged turbulent kinetic energy are compared with the case of submerged breakwater under the irregular wave fields. As one of significant results, it is confirmed that the pattern of nearshore current is different with the case of submerged breakwater.

최근 동해안을 비롯한 많은 해안에서 심각한 해안침식과 인접한 해안도로 유실 등과 같은 연안재해가 발생되고 있는 것은 널리 알려진 사실이다. 이에 대한 대안으로 유럽을 비롯한 해외에서는 저마루구조물(LCS, Low-Crested Structure)에 의한 연안재해 저감법이 활발하게 연구되고 있다. 본 연구에서는 선행연구를 바탕으로 투과성의 LCS 및 그의 주변 파동장에 olaFlow 모델을 적용하여 불규칙파동장 하의 3차원 수치해석을 수행한다. 이로부터 Hrms, 해빈류 및 평균난류운동에너지를 수치적으로 검토하며, 해빈류의 패턴과 평균난류운동에너지의 공간분포에 관해서는 불규칙파동장 하 잠제의 경우와 비교하였다. 이로부터 해빈류의 양상이 잠제의 경우와는 상반되게 나타나는 등의 중요한 결과를 얻을 수 있었다.

Keywords

References

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