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Journal of the Korean Society of Hazard Mitigation 2014;14(4):343-350.
Published online August 31, 2014.
불투과성 퇴적지형에 의한 다열 수중구조물 성능 평가
이준환, 차준호, 조용식
Performance Evaluation of Multi-Arrayed Submerged Structures by Impermeable Depositional Topography
Jun-Whan Lee, Jun-Ho Cha, Yong-Sik Cho
Abstract
The deposition between the two adjacent submerged structures over a long time can decrease the roles of structures and also threaten the safety of the coastal communities. In this study, the reflection of the incident water waves caused by deposition among multi-arrayed submerged structures are investigated by using the eigenfunction expansion method. The proper number of the steps representing a slope and the evanescent modes for calculating the reflection coefficient was suggested, and the resulting reflection coefficients were compared with the previous results. Not only the performance change due to difference styles of deposition and the amount of deposition between multi-arrayed submerged structures, but also the characteristic changes in the Bragg reflection caused by the deposition were studied. We found that the depositional topography affects the performance of multi-arrayed submerged structures. Thus, when designing multi-arrayed submerged structures, we have to consider the performance change by deposition.
Key Words: Eigenfunction expansion method; Reflection coefficient; Deposition; Bragg reflection
요지
오랜 시간동안의 인접한 두 수중구조물 사이 퇴적 작용은 수중구조물의 성능을 감소시켜 해안 도시 안전에 위협을 가할 수 있다. 본 연구에서는 다열 수중구조물 사이 불투과성 퇴적지형에 의한 파랑의 반사율을 고유함수전개법을 이용하여 해석하였다. 경사를 표현하는데 필요한 구간의 수와 반사율 계산에 필요한 소멸파 성분의 수를 제안하였으며 기존 결과와 비교하였다. 다열 수중구조물 사이 퇴적양상, 퇴적 양에 따른 성능 변화와 퇴적에 따른 Bragg 반사 특성 변화를 살펴보았다. 퇴적지형이 다열 수중구조물 성능에 영향을 주는 것을 확인하였다. 그러므로 다열 수중구조물 설계 시, 퇴적에 의한 성능 변화를 고려해야하다.
핵심용어: 고유함수전개법; 반사율; 퇴적; Bragg 반사
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