Application of Weibull model for redefined significant wave height distributions

Abstract

It is well accepted that the parent distribution for individual ocean wave heights follows the Weibull model. However this model does not simulate significant wave height which is the average of the highest one-third of some 'n' (n-varies) wave heights in a wave record. It is now proposed to redefine significal]t wave height as average of the highest one-third of a constant number (n-constant, say, n = 100) of consecutive individual wave heights. The Weibull model is suggested for simulating redefined significant wave height distribution by the method of characteristic function. An empirical support of 100.00% is established by x2-test at 0.05 level of significance for 3 sets of data at 0900, 1200 and 1500hrs at Valiathura, Kerala coast. Parametric relations have been derived for the redefined significant wave height parameters such as mean, maximum one-third average, extreme wave heights, return periods of an extreme wave height and the probability of realising an extreme wave height in a time less than the designated return period.

Wind-wave characteristics and extremes along the Emilia-Romagna coast

“…In this study, the statistical characteristics of H s were analysed using the methodology of fitting a probability distribution function (PDF) to the wave time series at the control points of the ER coastal belt. Many studies have indicated that the probability distribution used to model longterm distributions of wave heights is well represented by the two-parameter Weibull distribution (Muraleedharan et al, 1993(Muraleedharan et al, , 1998(Muraleedharan et al, , 1999. The PDF of a random variable x with the Weibull distribution (Weibull, 1951) is defined for positive values, x > 0, as…”

Wind-Wave Characteristics and extremes along the Emilia-Romagna coast

“…In this study, the statistical characteristics of H s were analysed using the methodology of fitting a probability distribution function (PDF) to the wave time series at the control points of the ER coastal belt. Many studies have indicated that the probability distribution used to model longterm distributions of wave heights is well represented by the two-parameter Weibull distribution (Muraleedharan et al, 1993(Muraleedharan et al, , 1998(Muraleedharan et al, , 1999. The PDF of a random variable x with the Weibull distribution (Weibull, 1951) is defined for positive values, x > 0, as…”