Abstract
The L-moments of the Weibull distribution are derived and incorporated in the regional frequency analysis of peaksover-threshold significant wave heights at eleven stations along the eastern coast of Japan Sea. The effective duration of wave measurements varies from 18.0 to 37.2 years with the mean rate of 10.4 to 15.1 events per year. The eleven stations are divided into three regions to assure homogeneity of the data. Both the Weibull and Generalized Pareto (GPA) distributions fit well to the observed data. The 100-year wave height varied from 8.2 to 11.2 m by the Weibull and 7.6 to 10.3 m by the GPA. The GPA distribution is not recommended for determination of design waves for these stations because it has an inherent upper limit and a tendency of under-prediction.
 
 
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Highlights
Extreme wave analysis is the first step in coastal structure design by providing the basis of selecting design wave heights
There are many methods for distribution fitting to the data set such as the method of moments, probability-weighted moment method, least squares method, maximum likelihood method, L-moments method, etc., among which the L-moments method is the newest one proposed by Hosking (1990)
Derivation of the L-moments of Weibull distribution is made and the regional frequency analysis of extreme waves at the Japan Sea coast with large data sets is described in the present paper
Summary
Extreme wave analysis is the first step in coastal structure design by providing the basis of selecting design wave heights. Derivation of the L-moments of Weibull distribution is made and the regional frequency analysis of extreme waves at the Japan Sea coast with large data sets is described in the present paper.
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