Background
Site Specific MetOcean data was required at two Blocks in the UK sector of the North Sea.
Scope of Work
CA Metocean was appointed to provide the required MetOcean data, including directional independent extremes, ISO compliant Hmax, omni-directional associated extremes, IFORM contours, spectral analysis for the extreme conditions and fatigue data.
Key Features
- Several global and regional hindcasts were retrieved and compared against each other and available measurements (satellite and in-situ) to ensure consistency and select the most adequate to derive results.
- Both the maximum wave height and maximum wave crest elevation were calculated using methods that are compliant with ISO 19901-1, using software developed and verified by CA Metocean, which applies the Tromans & Vanderschuren (1995) method.
- Associated extremes were derived using in-house developed and verified software based on the method described on a paper by Winterstein et al (1993), referred to as the I-FORM method with an adaptation to firstly establish the correlation between the two variables to analyse.
- Raw 2D wave spectral data was obtained and used to determine the most appropriate theoretical spectrum to use at the interest location using the following approach:
- The wave spectrum partitioning was done using in-house developed and verified software based on a paper by Hanson and Phillips (2001)
- Once the partitioning was done, the recommended JONSWAP’s peak enhancement factors for the total sea state, wind sea and swell partitions were derived by fitting the actual data from the model output to the theoretical distribution
