The peak over threshold (POT) method and the generalized Pareto distribution (GPD) model are studied based on 22-year hindcasted wave data. The initial data are divided into many groups with the fixed time interval to ensure the independence of the maximal value within every group. To realize this function, 3-day and 5-day are selected as the fixed time intervals, which are used to obtain the sample to extrapolate extreme significant wave heights with return periods of 100-year, 200-year and 500-year at 4 locations in the Yellow Sea (YS).
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