航走出会い波浪の特性

概要

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The shipborne-type wave height meter-using microwave Doppler radar is capable to measure the ocean waves while she is steaming. Instruments of this type are already installed on more than 100 ships. The encountering wave period measured by the instrument onboard depends on the ship's speed and the course. But it has seemed that ship's speed and course do not affect the wave height. However, there are some recent reports that the wave heights measured at the almost same time in various ship's course are different from each other. So, we investigated the characteristics of waves measured by a ship under way using the numerical simulation technique. In the result, it became clear that the frequency distribution of the wave heights is affected according to the encountering period of component waves. The significant wave height is defined as the mean of the highest one-third of the waves. So, It is not strange that the significant wave height of following waves is smaller than that of the head waves. On the other hand, the value of estimated significant wave height, which is derived from the wave spectrum, is not generally affected by ship's speed and course.
社団法人日本航海学会の論文
2001-03-25