Abstract
A conventional linear analysis(LA) and circular analysis(CA) are conducted for hindcasts-based and measurements-based one or two hourly wave direction data samples over 12 years at 43 onshore and off-shore stations around Japan. The main findings are as follows: 1) Both LA 1 auxiliarily using the CA-based mean value and LA 2 directly using the mean approximate CA-based statistics such as not only mean value but also standard deviation, skewness and kurtosis for either hindcasts or measurements, in cases where closer agreement is obtained for lower order statistics. 2) The above-mentioned results also hold for the statistics on hindcast-measurement difference-based error. 3) The error for mean value of wave direction is less than ±10 degrees at each of almost all stations, which suggests a higher accuracy of the hindcasts.
