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- W2078650404 abstract "파향이 약간 다르게 진행하는 두 규칙파는 비선형적 상호작용에 기인하여 파봉선이 벌집구조와 유사한 모습을 갖는 현상이 발생하고, 벌집구조 모양의 파봉선 사이에 일정하게 파랑에너지가 매우 낮게 유지되는 노드선 영역이 생성된다. 이러한 파봉선 벌집구조 모양이 해변에 형성되면, 해안선 직각방향으로 생성되는 노드선 영역을 통하여 이안류가 발달하게 된다. 본 연구에서는 해변가에 형성되는 벌집구조 파봉선 현상이 해운대에서 발생하는 이안류의 주요한 메카니즘임을 확인하기 위하여, Boussinesq 파랑모형을 이용하여 일방향 규칙파에 의한 해운대 연안흐름의 수치해석을 수행하고 이를 분석하였다. 그 결과, 해운대 앞바다의 해저천퇴에 따른 파랑굴절로 파향이 서로 약간 다른 파랑들이 해안에 전파되고, 이에 따라 벌집구조가 형성되어 노드영역을 따라 이안류가 매우 잘 발달함을 확인할 수 있었다. 또한, 일정한 파고와 주기를 갖는 다양한 폭의 스펙트럼에 따른 불규칙파 수치모의를 수행하므로, 폭이 넓은 스펙트럼 파랑조건보다 규칙파에 가까운 폭이 좁은 스펙트럼의 파랑조건에서 이안류가 더 잘 발달하는 것을 확인하였다. Two regular progressive wave trains, the directions of which are slightly different from each other, develop a honeycomb pattern of wave crests due to their nonlinear interaction. In the honeycomb pattern of wave crest, the nodal line area, which has very low wave energy, is formed. When the honeycomb pattern is developed near the beach area, rip current evolves through the nodal line area formed in the cross shore direction. In this study, to confirm that the formation of honeycomb pattern of waves near the beach area is a dominant mechanism of rip current occurred at Haeundae beach, we performed a numerical simulation of nearshore circulation at Haeundae beach under an unidirectional and monochromatic wave condition by using a nonlinear Boussinesq equation model. As a result, wave refraction due to topographical characteristics (i.e., submerged shoal) of Haeundae gave rise to several wave trains propagating with slightly different directions toward the beach, and consequently rip currents well developed through the nodal line area of honeycomb patterns of wave crest. In addition, we found that a narrow-banded spectral wave condition (i.e., a swell spectrum) increases more likelihood of rip current than a broad-banded spectral wave condtion based on the simulations employing various wave spectra with an equivalent wave height and period." @default.
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- W2078650404 date "2012-09-15" @default.
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- W2078650404 title "Numerical Study on a Dominant Mechanism of Rip Current at Haeundae Beach: Honeycomb Pattern of Waves" @default.
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