定点における波高統計値について

概要

論文の詳細を見る
It is said that the statistics of wave heights follow their log-normal distribution. The main part of the distribution, however, fits in very good manner, the linearity is destroyed in the high wave height region. The reason of this distortion can be thought as follows ; the observation method, number of data or sampling, and meteorological condition and/or wave nature itself. Mostly the wave statistics are obtained from the ship's visual observations in the area settled in an ocean, and the number of observations is not enough. So the consecutive 6 hourly records of Station T (29°N, 135°E) for 10 years (1967-1976) are plotted, and are found that the data fit to log-normal distribution very well. Then the number of data was reduced to 1/2 through 1/16 at random, and found that the linearlity became shaky in the high wave height region. One reason of this distortion from the log-normal can be concluded by the result of data sampling. In these cases, extending the straight line of 10 through 95% ranges to the higher range may be reasonable. Annual extreme values are also investigated, and shown that the mean annual extreme value is nearly equal to the wave height corresponding to the percentage of (N-1)/N of all wave data.
公益社団法人日本航海学会の論文
1980-01-15