비선형 진폭⋅주기 확률분포를 활용한 유한수심 해역에서의 불규칙파랑 Monte Carlo Simulation

• 영문명: Monte Carlo Simulation of Random Waves at Finite Depth Based on the Joint Distribution of Wave Amplitude and its Associated Period in Nonlinear Random Waves of Finite Bandwidth
• 발행기관: 한국연안방재학회
• 저자명: 조용준(Yong Jun Cho)
• 간행물 정보: 『한국연안방재학회지』제9권 제1호, 61~73쪽, 전체 13쪽
• 주제분류: 사회과학 > 사회과학일반
• 파일형태: PDF
• 발행일자: 2022.01.31

영문 초록

This study aims to develop a new methodology to generate random waves from a joint distribution of wave amplitude and its associated period. In doing so, the wave spectrum was derived from the joint distribution of wave amplitude and associated period and compared with the Wallops spectrum, which has been most frequently referred to in the literature. Numerical simulation shows that the nonlinearity of random waves makes a significant difference in the wave spectrum. These differences are summarized by a somewhat excessive peak period of the semi-empirical wave spectrum and underestimating wave energy over the high-frequency band. These behavioral characteristics of wave spectrum derived from the joint distribution of wave amplitude and its associated period are conceived to be due to the intrinsic property of the nonlinear random waves. The rationale of this reasoning can be found in the fact that non-negligible amount of wave energy shifts to the relatively short and long period band due to the resonant wave-wave interaction as nonlinearity is getting more pronounced as widely known in the coastal engineering community after studies of Hasselmann(1967) and Phillips(1980) on the developments of wind waves. Among the differences mentioned above, an excessively high peak period can be fully predicted by recalling that the wave period is getting shortened due to the phase difference between the free mode waves among the higher-order harmonic components appearing in random waves due to resonant wave-wave interaction and the resulting destructive interaction.

목차

1. 서론

2. Longuet-Higgins(1963)의 비선형 파랑모형

3. 현재 가용한 파마루⋅주기 결합분포

4. 거친 해양환경에서의 불규칙 파랑을 대상으로 한 파마루⋅주기 결합분포

5. 파랑 스펙트럼

6. 수치 모의

7. 결론

키워드

Nonlinear random Waves: Wallops spectrum Monte Carlo Simulation Wave height and period distribution Sub-harmonic wave-wave interaction