Case Studies of Extreme Wave Analysis: A Comparative Analysis

by Gerbrant van Vledder, Delft Hydraulics, Emmeloord, Netherlands,
Yoshimi Goda, Delft Hydraulics, Emmeloord, Netherlands,
Peter Hawkes, Delft Hydraulics, Emmeloord, Netherlands,
Etienne Mansard, Delft Hydraulics, Emmeloord, Netherlands,
Maria Jesus Martin, Delft Hydraulics, Emmeloord, Netherlands,
Martin Mathiesen, Delft Hydraulics, Emmeloord, Netherlands,
Eric Peltier, Delft Hydraulics, Emmeloord, Netherlands,
Edward Thompson, Delft Hydraulics, Emmeloord, Netherlands,



Document Type: Proceeding Paper

Part of: Ocean Wave Measurement and Analysis

Abstract: Several methods of extremal wave analysis have been applied to two sets of deep water extreme wave data. One set consisted of three-hourly sea-state records collected during a nine year period with a wave buoy at Haltenbanken off the Norwegian coast. The other set comprised a 20-year period of storm peak wave heights, obtained via a numerical hindcast of historical storms. For both data sets, 100-year return wave heights with corresponding 90% confidence intervals were computed with a variety of extremal analysis techniques, including the Initial Distribution Method, the Annual Maxima Method, and the Peak over Threshold Method. FT-I, Weibull and other probability distributions were fitted to the data by the Method of Moments, Least Squares Method, and the Maximum Likelihood Method. The results of the study show that for both data sets the estimated 100-years return wave heights differ less than 10% of one another. It was also found that the effect of choices in the data selection, e.g., the choice of the threshold, has a significant effect on the estimated wave heights.

Subject Headings: Least squares method | Water waves | Data analysis | Storms | Moment distribution | Case studies | Comparative studies

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