ABSTRACT
The knowledge of the frequency of extreme wave heights, i.e., the extreme quantiles, is highly essential for the design of civil engineering structures and for the operation and safety of shipping. Estimation of these frequencies is difficult because extreme quantiles are rare. This problem is resolved by the regional frequency analysis (RFA), joining data from several sites of identical wave characteristics for estimating the event frequencies at any one site. L-moments are utilized in the estimation process of regional frequency analysis (Hosking and Wallis, 1997). From the different methods of regional frequency analysis that exist, the regional probability weighted moments (PWM ) algorithm is considered to be more efficient (Cunnane, 1988).TheL-moments are statistical quantities derived from probability weighted moments and they increase the accuracy and use of the analyses based on these PWMs.
