The L-moments method is applied for the POT storm wave data at eight stations around Japan, which have the record length of 27 to 38 years. The formulas of the L-moments of the Weibull distribution are newly derived for estimation of the shape, scale and location parameters from a sample. A new index called TUD (Twenty-Up Deviation) is developed for judgment of the degree of goodness of data fitting to a candidate distribution. Among eight stations, two stations show the best fitting to the Weibull distribution, four to the General Pareto (GPA) distribution, and two to the General Extreme-Value (GEV) distribution. At two stations fitted to the GPA distribution, the theoretical upper bounds of extreme wave heights are only 7% to 11% greater than the observed maximum wave height.
PROCEEDINGS OF COASTAL ENGINEERING, JSCE
PROCEEDINGS OF THE JAPANESE CONFERENCE ON COASTAL ENGINEERING