RECENT DEVELOPMENTS IN THE DERIVATION OF LONG PERIOD WAVE CRITERIA

This paper describes the measurement and analysis of long period waves to support the design of coastal facilities. The suitability of sub-surface pressure sensors for the measurement of long period waves is discussed. The analysis involves the calculation of significant wave heights in a number of discrete wave period bands from 15 seconds to just over 5 minutes. Wave height are calculated from the variance in band pass filtered time series, and from high resolution spectra. Spectral analysis techniques that are used as standard for the analysis of short period waves are not appropriate for this application. The criteria produced from the analysis are suitable for vessel response simulations, marine facility and coastal infrastructure design.