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 Wave Field around Three-Dimensional Low-Crested Structure

3차원저천단구조물(LCS) 주변에서 파동장의 변동특성

  • Lee, Jun Hyeong (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Bae, Ju Hyun (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • An, Sung Wook (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Lee, Kwang Ho (Dept. of Energy and Plant Eng., Catholic Kwandong University) ;
  • Kim, Do Sam (Dept. of Civil Eng., Korea Maritime and Ocean Univ.)
  • 이준형 (한국해양대학교 대학원 토목환경공학과) ;
  • 배주현 (한국해양대학교 대학원 토목환경공학과) ;
  • 안성욱 (한국해양대학교 대학원 토목환경공학과) ;
  • 이광호 (가톨릭관동대학교 에너지자원플랜트공학과) ;
  • 김도삼 (한국해양대학교 건설공학과)
  • Received : 2019.06.05
  • Accepted : 2019.06.26
  • Published : 2019.06.30
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Abstract

In recent years, countries like Europe and Japan have been involved in many researches on the Low-Crested Structure (LCS) which is the method to protect beach erosion and it is regarded as an alternative to the submerged breakwaters, and compiled its results and released the design manual. In the past, studies on LCS have focused on two-dimensional wave transmission and calculating required weight of armor units, and these were mainly examined and discussed based on experiments. In this study, three-dimensional numerical analysis is performed on permeable LCS. The open-source CFD code olaFlow based on the Navier-Stokes momentum equations is applied to the numerical analysis, which is a strongly nonlinear analysis method that enables breaking and turbulence analysis. As a result, the distribution characteristics of the LCS such as water level, water flow, and turbulent kinetic energy were examined and discussed, then they were carefully compared and examined in the case of submerged breakwaters. The study results indicate that there is a difference between the flow patterns of longshore current near the shoreline, the spatial distribution of longshore and on-offshore directions of mean turbulent kinetic energy in case of submerged breakwaters and LCS. It is predicted that the difference in these results leads to the difference in sand movement.

최근, 유럽이나 일본 등은 해빈유실방지대책공법의 하나이며, 잠제의 대안으로 여겨지는 저천단구조물(LCS)에 관한 많은 연구를 수행하였고, 그의 결과들을 집약하여 설계매뉴얼까지 편찬하였다. 지금까지 LCS에 관한 연구는 2차원적인 파랑전달율과 피복재의 안정중량산정에 치우쳐 있으며, 이들은 주로 실험에 기초하여 검토 논의되었다. 본 연구에서는 투과성의 LCS를 대상으로 3차원수치해석을 수행한다. 수치해석에 Navier-Stokes 운동방정식에 기반한 오픈소스 CFD Code인 olaFlow를 적용하였으며, 이는 쇄파와 난류해석까지도 가능한 강비선형해석법이다. 이로부터 수위, 흐름 및 난류운동에너지 등의 분포특성을 검토 논의하였으며, 동시에 잠제의 경우와도 비교 검토하였다. 이로부터 해안선 근방에서 연안류의 흐름패턴과 평균난류운동에너지의 연안방향 및 종단방향의 공간분포에 관해 잠제와 LCS의 경우에 각각 차이가 발생하는 것을 알 수 있었다. 이러한 결과의 차이는 모래이동에서의 차이로 이어질 것으로 판단된다.

Keywords

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