Research Papers

On the Occurrence of Abnormal Waves in an Offshore Tank

[+] Author and Article Information
E. M. Antão, C. Guedes Soares

Centre for Marine Technology and Engineering, Technical University of Lisbon, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal


J. Offshore Mech. Arct. Eng 130(2), 021008 (Jun 09, 2008) (8 pages) doi:10.1115/1.2913348 History: Received November 01, 2006; Revised April 17, 2007; Published June 09, 2008

A set of wave data generated in an offshore tank is studied. The set of the largest waves in those sea states is studied with respect to steepness, asymmetry, and nonlinearity. It was possible to find some waves that were classified as abnormal or freak according to presently accepted criteria. Their statistics connected to steepness and nonlinearity was determined. Comparison of the nonlinearity as well as statistics of the largest waves in the offshore tank and at sea was performed so as to identify any limitation in reproduction of the properties of large waves in model basins.

Copyright © 2008 by American Society of Mechanical Engineers
Topics: Waves , Seas
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Figure 1

The DHI 3D offshore wave basin

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Figure 2

Example of time series recorded in the DHI basin

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Figure 3

Basic definitions for asymmetric waves

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Figure 4

Comparison between different coefficients of steepness calculated for largest waves in the series: (a) steepness upcrossing sU and steepness downcrossing sD; (b) front steepness sf and back steepness sb

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Figure 5

Results for coefficients of horizontal and vertical asymmetry

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Figure 6

Relation between skewness and kurtosis in sea states with large waves

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Figure 7

Relation of a large wave crest and wave steepness calculated from: (a) downcrossing and (b) up-crossing definitions

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Figure 8

Skewness against individual freak wave steepness for tank generated waves

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Figure 9

Skewness against sea state steepness for second-order simulations of sea states, theory and tank generated waves

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Figure 10

Relation between skewness and excess kurtosis in the tank generated sea states with freak waves

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Figure 11

Comparison between vertical asymmetry of tank data and second-order theory and simulations




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