SAMPLING BIAS IN THE ESTIMATION OF SIGNIFICANT WAVE HEIGHT EXTREME VALUES

Fabio Dentale, Ferdinando Reale, Felice D'Alessandro, Leonardo Damiani, Angela Di Leo, Eugenio Pugliese Carratelli, Giuseppe Roberto Tomasicchio

Abstract


It has been shown before, and it is intuitively evident, that in a Significant Wave Height (SWH) time series, the longer the sampling interval, the lower is the number of events which are above a given threshold value. As a consequence, the use of data with a low time resolution (such as a 3 h sampling, for instance) causes a considerable undervaluation of the extreme SWH values for a given return time RT. In this paper an example of such a bias is provided, and a method is suggested to estimate it on a regional basis. Results may help to improve the use of historical wave meters data which were often collected with a low time resolution, and may also provide a tool to improve the application of Numerical Meteo-Wave models to the evaluation of extremes.

Keywords


extreme waves; sampling bias; wave measurement

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DOI: https://doi.org/10.9753/icce.v35.waves.33