Boussinesq 모델을 이용한 제주 차귀도 해역의 다방향 불규칙파 시뮬레이션

Abstract

Based on Boussinesq wave model, the wave distribution at Chagui-Do sea area in Jeju was simulated by applying the directional irregular waves at an incident boundary. The time and spatial variations of monthly mean wave height and period were investigated, which aims to provide basic information on optimal sites for wave power generation. The grid size and time interval of Boussinesq wave model were validated by examining wave distributions around a surface piercing wall fixed at sea bottom with a constant slope. Except the summer season, the significant wave height is dominated by wind waves and appears to be relatively high at the north sea of Chagui-Do which is open to the ocean, while it is remarkably reduced at the rear sea of Chagui-Do because of its blocking effect on incident waves. In the summer, the significant wave height is higher at the south sea and it is dominated by the swell waves which is contributed by the strong south-west wind. The magnitude of significant wave height is the largest in the winter and the lowest in the spring. Annual average of the significant wave height is distinctively high at the west sea close to the Chagui-Do coast due to a steep variation of water depth and corresponding wave focusing effect. The seasonal and spatial distribution of wave period around Chagui-Do sea reveals very similar characteristics to the significant wave height. It is suggested that the west sea close to Chagui-Do coast is the most promising site for wave power generation.