다열 불투과성 수중방파제를 통과하는 다방향 불규칙파랑의 해석
Analysis of Multi-directional Random Waves Propagating over Multi Arrayed Impermeable Submerged Breakwater
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참고문헌
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초록
본 연구에서는 고유함수전개법을 사용하여 다열 불투과성 수중방파제를 통과하는 다방향 불규칙파랑의 통과와 반사를 계산하였다. 입사하는 다방향 불규칙파랑은 Bretschneider-Mitsuyasu 주파수 스펙트럼과 Mitsuyasu 타입의 방향스펙트럼을 사용하여 재현하였다. 첨두주파수의 Bragg 반사 조건에서 강한 반사가 발행하였다. 수중방파제가 3열이고, 상대높이가 0.6일 때 입사하는 다방향 불규칙파 에너지의 25% 이상이 외해로 반사되었다. 그리고, 최대분산계수 smax가 증가할 경우, 다방향 불규칙파랑의 반사율도 증가하였다.
Abstract
In this study, transmission and reflection of multi-directional random waves propagating over impermeable submerged breakwaters are calculated by using eigenfunction expansion method. A series of muti-derectional random waves is generated by using the Bretschneider-Mitsuyasu frequency and Mitsuyasu type directional spectrum. Strong reflection is occurred at the Bragg reflection condition of the peak frequency. If the row of breakwaters is fixed at 3 and the relative height of breakwater is fixed at 0.6, more than 25% of incident wave energy is reflected to offshore. It is also found that the reflection of directionally spreading random waves increases as the maximum spreading parameter smax increases.
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