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Joint environmental description for three locations on the Norwegian Continental Shell and for the West of Shetlands

A joint environmental description including possibility of environmental parameters approaching from different directions has been developed by DNV for three locations at the Norwegian Continental Shell and for the West of Shetland. The probabilistic models developed are tailor made for load and load effect analysis of floating structures, their mooring arrangement and riser systems. Both instrumental data and hindcast data have been considered.

The following parameters are included in the joint model: wind speed, main wind direction, significant wave height (sea and swell), spectral peak period (sea or swell), main wave direction (wind sea and swell), current speed and current direction. Two approaches for including wind-sea and swell are suggested. In the first approach the distribution of total significant wave height and spectral peak period is combined with the two-peak Torsethaugen wave spectrum, which includes a procedure for splitting wave energy between wind-sea and swell. The alternative joint model approximates wind-sea and swell by separate distributions. The latter approach requires a wave spectrum including contribution from wind-sea and swell as, e.g. the Jonswap-Glenn spectrum.

Long-term distributions of significant wave height established using 18-year and 26-year annual, storm and global wave field data have been compared. As expected the study shows that differences between extremes predicted by the three distributions decrease with increasing number of years considered. Statistical and model uncertainties related to the annual, storm and global model have been specified.

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