Abstract
The paper deals with the analysis of severe storms in the central Mediterranean Sea and in the US coasts of the Atlantic and Pacific Ocean. Firstly, we introduce a model for the representation of the sea storms by means of two parameters: the former is given by the maximum value of significant wave height in the actual storm and defines the storm intensity, the latter gives the storm duration. The analysis considers buoy data with different sampling Δt between two consecu- tive records, which varies in the range 0.5 - 6 hours. The sensitivity analysis of the modelled sea storm with the varia- tion of Δt shows as the structure of storms is strongly modified with large values of Δt of order of 3 - 6 hours: both the intensity and the duration may change significantly. The results are of interest to investigate the extreme events in the storms obtained with WAve Model, starting from meteorological data, where the value of Δt of 6 hours is widely applied. The conclusion is that structure of severe storms should be represented with continuous data, with Δt = 0.5 hours; a good representation is also obtained with Δt = 1 hour. The errors with increasing values of Δt are investigated.
Highlights
We introduce a model for the representation of the sea storms by means of two parameters: the former is given by the maximum value of significant wave height in the actual storm and defines the storm intensity, the latter gives the storm duration
A sea storm is a sequence of sea states, in which the significant wave height exceeds a fixed threshold, whose value depends on the considered location [1,2,3]
The paper has shown the comparison among some severe storms, recorded by buoys of NOAA-NBDC network in the Atlantic and Pacific Oceans and by RON Italian network, in the Central Mediterranean Sea
Summary
A sea storm is a sequence of sea states, in which the significant wave height exceeds a fixed threshold, whose value depends on the considered location [1,2,3]. Statistical properties of waves in a sea storm were investigated by Borgman [8,9], who determined the cumulative distribution function of the maximum wave height in a sea storm through an integral form This result is very important for long-term analysis of extreme waves, based on the concept of extremes during a sea storm. The Equivalent Triangular Storm model [4], as well as the Equivalent Power Storm model [10], represents a storm by means of two parameter: the former giving the intensity of the storm, the latter the duration of the storm Both models enable to determine, with an analytical approach, the long-term statistics of severe storms [4,5,6,7, 10]. Some comments are given on the effect of the results on long-term modeling by applying the equivalent storm approaches [4,5,6,7,10,11]
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