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Wave Interaction between Offshore Structure with Partial Reflecting Boundary and Waves in Various Coastal Topography

다양한 해안지형에서 부분반사율을 갖는 해상구조물과 파랑의 상호작용에 관한 연구

Jinhyeaok Jang1
,
Hojin Lee2*
,
Sungduk Kim3
장 진혁1
,
이 호진2*
,
김 성덕3
1PhD Candidate, School of Civil Engineering, Chungbuk National University
2Professor, School of Civil Engineering, Chungbuk National University
3Instructor, School of Civil Engineering, Chungbuk National University
*Corresponding Author
1 August 2025. pp. 21-27
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Abstract

This study has investigated the wave height distributions due to the interaction between waves and offshore structures with partial reflecting boundary in sea area with various coastal topography. Analytical solutions based on the Fresnel integral were applied along with numerical solutions of Boundary Element Method (BEM) based on the boundary integral equation, and the results were compared and analyzed. The form of the offshore structure was set as a insular breakwater, and the incident waves to the offshore structure were analyzed when they are in the normal direction and incident with an angle. The results of wave height distributions derived from the two methods were compared through the implementation of various calculation conditions and have been expressed through graphs and contours. In all cases, excellent correspondence has been made between the Fresnel integrals. When comparing the numerical solutions (BEM) to the analytical solutions, the two solutions correspond well with each other. Through the results of this study, a lot of data can be acquired in various coastal and marine field research, and accurate wave height distribution can be presented when calculating, and when installing offshore structures in sea areas with various coastal topography, information can be provided for designing the specifications of offshore structures, such as their direction and length.

Keywords
Wave height distribution
offshore structure
boundary element method (BEM)
Fresnel integral
partial reflecting boundary

본 연구는 다양한 해안 지형형태를 갖는 해역에서 부분 반사 경계를 갖는 해상 구조물과 파랑의 상호작용에 관한 파고 분포를 조사한 것이다. 경계 적분 방정식을 기반으로 한 경계 요소법의 수치해와 함께 프레넬 적분에 기반한 해석해를 적용하여 서로 비교·분석하였다. 해상 구조물의 형태는 일체형 도제식 방파제로 설정하였으며, 해상 구조물로 입사하는 파가 법선 방향일 때와 경사져서 입사할 때를 분석하였다. 두 가지 방법으로 도출된 파고 분포의 결과는 다양한 계산 조건의 구현을 통해 비교하였으며, 그래프와 등고선도를 통해 표현하였다. 모든 경우에서 프레넬 적분의 해석해와 경계요소법에 의한 수치해가 서로 잘 일치하는 것을 발견하였다. 본 연구의 결과를 통해 다양한 해안 및 해양의 현장 연구 분야에서 많은 데이터를 습득하여 계산할 때 정확한 파고분포를 제시할 수 있으며, 다양한 해안 지형을 갖는 해역에서 해상 구조물을 설치할 때, 그 방향과 길이 등 해상 구조물의 제원 설정에 정보를 제공할 수 있다.

키워드
파고분포
해상 구조물
경계 요소법
프레넬 적분
부분 반사 경계
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Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 26
  • No :8
  • Pages :21-27
  • Received Date : 2025-06-17
  • Revised Date : 2025-06-25
  • Accepted Date : 2025-07-09
  • DOI :https://doi.org/10.14481/jkges.2025.26.8.21
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