Spectral shapes and parameters from three different wave sensors

Abstract The quality of wave measurements is primary importance for the validation forecasting models, satellite calibration and validation, physics, offshore operations design climate monitoring. Validation global forecasts revealed significant regional differences, which were linked to different buoy systems used by countries. To fully understand differences between measurement systems, it necessary go beyond investigations integral parameters height, period direction, into frequency spectra four directional Fourier that are estimate distribution. We here analyse data measured from three sensors (non-directional Datawell Waverider buoy, WaveRadar Rex, Optech laser) operating at Ekofisk oil production platform located in central North Sea over a several months, with height ranging 1 10 m. In general, all provide similar properties spectra, although there some could impact operations, forecast verification For example, radar underestimates energy bands higher than 8 s 3–5%, swell (12.5–16 s) 5–13%, while laser has 1–2% more most energetic bands. Lee effects structures also estimated. Lower tail an effect on periods (they higher); steepness seen be reduced 10% wind seas. Goda peakedness unidirectional Benjamin-Feir index examined sensors.