STATISTIC ANALYSIS OF WAVE PARAMETERS FOR THE CHINA SEA

A statistical analysis of annual wave extremes acquired at 19 observation stations in the China Sea was carried out. Five types of distribution curves were adopted: Pearson III (P-III), Log-Extreme Values I (LE), Log- Normal (LN), Weibull (W) and Exponential GAMMA (E GAMMA) to check the adaptability to the long-term distribution of annual extremes of waves in the China Sea area. The NFIT method and PWM method were used to estimate the distribution parameters, and thereby to derive the design wave parameters with different return periods at 19 observation stations. The test results showed that by combining E GAMMA distribution and NFIT parameter estimation and optimum seeking by computer, the design wave parameters can be estimated accurately, quickly and efficiently and the randomness of estimated results can be avoided.