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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(3); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(3): 180-198. doi: https://doi.org/10.9765/KSCOE.2019.31.3.180
3차원저천단구조물(LCS) 주변에서 파동장의 변동특성
이준형1, 배주현1, 안성욱1, 이광호2, 김도삼3
1한국해양대학교 대학원 토목환경공학과
2가톨릭관동대학교 에너지자원플랜트공학과
3한국해양대학교 건설공학과
Variation Characteristics of Wave Field around Three-Dimensional Low-Crested Structure
Jun Hyeong Lee1, Ju Hyun Bae1, Sung Wook An1, Kwang Ho Lee2, Do Sam Kim3
1Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University
2Dept. of Energy and Plant Eng., Catholic Kwandong University
3Dept. of Civil Eng., Korea Maritime and Ocean Univ., 727 Taejong-ro, Yeongdo-ku, Busan 49112, Korea
Corresponding author: Do Sam Kim ,Tel: +82-51-410-4463, Fax: +82-51-403-0656, Email: kimds@kmou.ac.kr
Received: June 5, 2019;  Accepted: June 26, 2019.
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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.
Keywords: olaFlow, low-crested structure, submerged breakwater, three-dimensional numerical analysis, gap, water level, flow, vorticity, turbulent kinetic energy
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