抄録
The study discusses the influence on long-term predictions of the ship response by using Global Wave Statistics data with special emphasis given to its scatter diagram rounded by one thousandth (1/1000). In order to compare with other wave data, such as Walden's data rounded by 0.01/1000, GWS standard scatter diagrams of significant wave height and zero-crossing wave period are suggested to correct to a round number of 0.01/1000 by fitted with a model of the conditional log-normal distribution for zero-crossing wave period in the North Atlantic. The statistical characteristics both corrected and not corrected wave data are calculated. A numerical example of the effect by using corrected and not corrected one for ship acceleration in the vertical direction is given. Based on the present comparison, it is shown that the influence on long-term predictions of the ship response by using original GWS data (rounded by 1/1000) may be not neglected, and further investigations are required before any final conclusion can be drawn.
