Reconstructing sea-states in the Southern Ocean using ship motion data

Filippo Nelli, Armand van Zuydam, Karl Pferdekamper, Alberto Alberello, Marzieh Derkani, Anriëtte Bekker, Alessandro Toffoli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Sea state conditions can be estimated from the motion of a moving ship by converting its response to incident waves through the response amplitude operator. The method is applied herein to ship motion data from the icebreaker R/V Akademik Tryoshnikov and recorded during the Antarctic Circumnavigation Expedition across the Southern Ocean during the Austral summer 2016-17. The response amplitude operator of the vessel was estimated using two boundary element method models, namely NEMOH and HydroSTAR. An inter-comparison of model performance is discussed. The accuracy of the reconstructed sea states is assessed against concurrent measurements of the wave energy spectrum, which were acquired during the expedition with the marine radar WaMoS-II. Results show good agreement between reconstructed sea states (wave spectrum as well as integrated parameters) and direct observations. Model performances are consistent. Nevertheless, NEMOH produces slightly more accurate wave parameters when quantitatively compared against HydroSTAR.

Original languageEnglish
Title of host publicationOcean Engineering
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791885161
Publication statusPublished - 11 Oct 2021
Externally publishedYes
Event2021 40th International Conference on Ocean, Offshore and Arctic Engineering - Virtual, Online
Duration: 21 Jun 202130 Jun 2021

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE


Conference2021 40th International Conference on Ocean, Offshore and Arctic Engineering
Abbreviated titleOMAE 2021
CityVirtual, Online

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