Abstract

This work deals with an analysis of simultaneous wind and wave records collected at Natural Ocean Engineering Laboratory (NOEL) of Reggio Calabria, Italy. NOEL is a field laboratory located in the Messina’s Strait which is characterized by particular wind conditions that generate sea states representing small scale models of typical ocean storms. Wind data are collected by an anemometer located on a nearshore platform at 5 meters height above mean water level recorded with a frequency of 4Hz. Sea surface elevation is recorded by ultrasonic probes at intermediate water condition with a frequency of 10Hz. Wind data are provided in terms of wind speed fluctuations, while wave data in terms of sea surface elevation. Over time intervals compatible with the stationarity assumption, both wind speed fluctuations and sea surface elevation are represented by a gaussian process characterized by a given frequency spectrum. However, real data exhibit significant deviations from gaussian distribution. This work is focused on the analysis on whether wind and wave records are gaussian or not, elucidating analogies and differences between wind and wave processes. Results show that both wind and waves are asymmetric and non-linear. Waves are right skewed, having crests greater than troughs, while wind speeds fluctuations may be both right and left skewed, revealing that peak amplitudes can be larger than lulls and vice-versa. Deviation from gaussianity for wind speed can be larger than for waves.

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