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Publications
Lucas, C., Muraleedharan, G. and Guedes Soares, C. (2017) , “Regional Frequency Analysis of Extreme Waves in a Coastal Area”, Coastal Engineering, Vol. 126, pp. 81-95
The wave data from several locations in a given coastal region is analysed to identify the areas with comparable wave height statistics and to estimate regional extreme significant wave heights of designated return periods. The significant wave height data from 35 sites (35o-45oN, -6.5o- -11.0oW) in a coastal grid (0.25o x 0.25o) off Portugal in the North Atlantic Ocean was extracted from 44 years HIPOCAS hindcast wave database is subjected to Regional Frequency Analysis. Regional frequency analysis based on L-moments is performed to identify the discordant sites (discordant site statistics are grossly different from the group of sites), to form homogeneous regions by cluster analyses (using both site characteristics and site statistics) and to compose regions with similar site statistics. Consequently appropriate regional frequency distributions are selected to estimate regional extreme significant wave height quantiles of assigned return periods. The Regional Frequency Analysis algorithm recognises in certain cases, neighbouring sites as members of diverse regions, revealing that geographical proximity of sites are not ascertaining factors to form homogeneous regions. At-site analyses are also performed along with Regional Frequency Analysis to emphasise reliability on the regional extreme quantiles as true representatives of its at-site extreme quantiles.
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