| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 94 === In this study, Erlang, Gamma, Rayleigh, and Longuet-Higgins distribution were chosen to examine the best distribution of wave period among these four distributions for the field data in the whole year 2004 at the Hua-lien waters using four criteria that are the root mean square error, determinant coefficient, the double-peaked distribution and the isolated peaked distribution. Meanwhile five to seven groups are the most suitable number of histogram of wave period of each data.
The predicted significant period and average period are theoretically derived using the first and second moment of the spectrum of the Erlang distribution. For every data set Erlang distribution is the best approach to the wave period distributions when the significant wave height is over 1.5m. Otherwhile the significant wave height is smaller than 1.5m, Longuet-Higgins distribution is the best wave period distributions. However, the significant wave periods of one-month, quarter-month, and one year are also examined to best fit the Normal distribution.
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