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Wave Statistics and Spectra via a Variational Wave Acquisition Stereo System

[+] Author Affiliations
Guillermo Gallego, Anthony Yezzi

Georgia Institute of Technology, Atlanta, GA

Alvise Benetazzo

PROTECNO S.r.l., Padua, Italy

Francesco Fedele

Georgia Institute of Technology, Savannah, GA

Paper No. OMAE2008-57160, pp. 801-808; 8 pages
doi:10.1115/OMAE2008-57160
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 4: Ocean Engineering; Offshore Renewable Energy
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4821-0 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

We propose a novel variational Wave Acquisition Stereo System (WASS) that exploits new stereo reconstruction techniques for accurate estimates of the spatio-temporal dynamics of ocean waves. WASS has a significant advantage as a low-cost system in both installation and maintenance. A stereo camera view provides three-dimensional data (both in space and time) whose statistical content is richer than that of a time series retrieved from wave gauges, ultrasonic instruments or buoys, the latter being expensive to install and maintain. Indeed, wave spectra can be easily estimated from the multi-dimensional images obtained with WASS. The estimated spectra present an inertial range that decays as k−2.5 , k being the wave number, in agreement with wave turbulence theory (Zakharov 1999, Socquet-Juglard et al. 2005). Further, the empirical probability density functions derived from the reconstructed surface data compare very well with theoretical models (Tayfun & Fedele 2007, Fedele 2008). The variational WASS is a promising technology with broader impacts in offshore engineering since it will enrich the understanding of the statistics of waves for an improved design of offshore structures.

Copyright © 2008 by ASME

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