On the Statistical Characteristics of the New Year Wave Kim, Do Young;
In this paper time series wave data, which were measured at the Draupner platform in the North Sea on 1995, are used to investigate statistical characteristics of nonlinear wave. Various statistical properties based on time and frequency domain are examined. The Gram-Chalier distribution fits the probability of wave elevation better than the Gaussian distribution. The skewness of wave profile is 0.393 and the kurtosis is 4.037 when the freak wave is occurred. The nonlinearity of D1520 data is higher than two adjacent wave data. AI index of the New Year Wave is 2.11 and the wave height is 25.6m. The zero crossing wave period of the New Year Wave is 12.5s which is compared to the average zero up-crossing period 11.3s. The significant steepness of wave data is 0.077 when the freak wave was occurred. H1/3/ does not increases as the kurtosis increases and the values is close to 4. The New Year Wave belongs to highly nonlinear wave data packet but the AI index is within linear focusing range.
Ocean waves;Freak wave;New Year Wave;Wave heigh distribution;Abnormality Index(AI);
Forristall, G.Z., 1978. On the Statical Dstribution of Wave Heights in a Storm. J. Geophys. Res., 83, 2353-2358.
Haver S., 2003. Freak Wave Event at Draupner Jacket January 1 1995. Staoil, PTT-KU-MA.
Holliday, N.P., Yelland, M.Y., Pascal, R., 2006. Were Extreme Waves in the Rockall Trough the Largest Ever Recorded. Geophys. Res. Lett., 33, L05613.
Kalif, C., Pleinovsky, E., Slunyaev, A., 2009. Rogue Waves in the Ocean. Springer.
Kim, D.Y., 2007. On Individual Wave Height Distribution of Ocean Waves. Journal of Ocean Engineering and Technology, 21(2), 6-11.
Kim, D.Y., 2010. On the Characteristics of Freak Wave Occurrence. J. Korean Soc. for Marine Environmental Eng., 14 (2), 138-145.