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Publications
Lucas, C., Muraleedharan, G. and Guedes Soares, C. (2012), "Regional extreme frequency analysis in the North Atlantic ocean during the summer season", Sustainable Maritime Transportation and Exploitation of Sea Resources, Rizzuto & Guedes Soares (eds), Taylor & Francis Group, London, pp. 891-901
Accurate extreme wave height (quantile) estimations are vital for the design wave condition for marine structures. Since extreme events are rare, frequency of occurrences are difficult to estimate. Regional Frequency Analysis (RFA): an approach based on L-moments resolves this problem by pooling data from identical sites, sites with similar site statistics (L-moment ratios). RFA is applied for identification of sites that are grossly different from the group of sites, formation of regions (sites with similar site statistics), selection of appropriate regional frequency distribution and estimation of regional extreme quantiles of designated return periods. Incorrect data values, outliers, trends and shifts in the mean of a sample can all be reflected in the L-moments of the sample. The deep water daily maximum significant wave heights, HIPOCAS hindcast data of an offshore region in the North Atlantic Ocean in summer season (June to August) and spread over a period from 1958 to 1978 are subjected to Regional Frequency Analysis. 25 equally spaced (5°) sites (40°–60°N, -33°–-13°W) of dimensions 0.5°?×?0.5°?are considered. This study emphasizes the need of RFA for estimation of wave height statistics with required precision.
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