Observations of rogue seas in the Southern Ocean
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866916093837180928 |
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| author | Toffoli, Alessandro Alberello, Alberto Clarke, Hans Nelli, Filippo Benetazzo, Alvise Bergamasco, Filippo Ntamba, Butteur Ntamba Vichi, Marcello Onorato, Miguel |
| author_facet | Toffoli, Alessandro Alberello, Alberto Clarke, Hans Nelli, Filippo Benetazzo, Alvise Bergamasco, Filippo Ntamba, Butteur Ntamba Vichi, Marcello Onorato, Miguel |
| contents | We report direct observations of surface waves from a stereo camera system along with concurrent measurements of wind speed during an expedition across the Southern Ocean in the austral winter aboard South African icebreaker S.A.~Agulhas~II. Records include water surface elevation across a range of wave conditions, spanning from early stages of wave growth to full development. We give experimental evidence of rogue seas, i.e., sea states characterizided by heavy tails of the probability density function well beyond the expectation based on bound mode theory. These conditions emerge during wave growth, where strong wind forcing and high nonlinearity drive wave dynamics. Quasi-resonance wave-wave interactions, which are known to sustain the generation of large amplitude rogue waves, capture this behaviour. Wave statistics return to normality as the wind forcing ceases and waves switch to a full developed condition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_01841 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observations of rogue seas in the Southern Ocean Toffoli, Alessandro Alberello, Alberto Clarke, Hans Nelli, Filippo Benetazzo, Alvise Bergamasco, Filippo Ntamba, Butteur Ntamba Vichi, Marcello Onorato, Miguel Atmospheric and Oceanic Physics We report direct observations of surface waves from a stereo camera system along with concurrent measurements of wind speed during an expedition across the Southern Ocean in the austral winter aboard South African icebreaker S.A.~Agulhas~II. Records include water surface elevation across a range of wave conditions, spanning from early stages of wave growth to full development. We give experimental evidence of rogue seas, i.e., sea states characterizided by heavy tails of the probability density function well beyond the expectation based on bound mode theory. These conditions emerge during wave growth, where strong wind forcing and high nonlinearity drive wave dynamics. Quasi-resonance wave-wave interactions, which are known to sustain the generation of large amplitude rogue waves, capture this behaviour. Wave statistics return to normality as the wind forcing ceases and waves switch to a full developed condition. |
| title | Observations of rogue seas in the Southern Ocean |
| topic | Atmospheric and Oceanic Physics |
| url | https://arxiv.org/abs/2310.01841 |