Abstract
A series of field observation of ship waves consist of wave observation and visual one has been carried out in Ishigaki port. The wave observation is continuous observation for 3 days by using five wave gages. The visual observation is also conducted to obtain information ships navigating in the port. By analyzing the observation data, it is confirmed that (1) ship waves amplify the waves in Ishigaki port, (2) wave height, period, and direction of ship waves are quantitatively obtained, and (3) wave reflection coefficients against ship waves for vertical wall and breakwater with wave dissipating blocks take smaller value than those against general waves.
The observation result also indicates that ship waves generated in the port is a possible factor to make the calmness worse even if the port is adequately protected from ocean waves.
