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Discussion papers
https://doi.org/10.5194/os-2018-111
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2018-111
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 12 Nov 2018

Research article | 12 Nov 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Fish oil in a wave tank: a look at the air-water response

Alvise Benetazzo1, Luigi Cavaleri1, Hongyu Ma2, Shumin Jiang2, Filippo Bergamasco3, Wenzheng Jiang2, Sheng Chen2, and Fangli Qiao2 Alvise Benetazzo et al.
  • 1Istituto di Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche (CNR), Venice, Italy
  • 2First Institute of Oceanography (FIO), State Oceanic Administration (SOA), Qingdao, P. R. China
  • 3DAIS – Università Ca'Foscari, Venice, Italy

Abstract. Surfactant layers with viscoelastic properties floating on the water surface damp short gravity-capillary waves. Inspired by the known virtue of fish oil to still angry seas, a laboratory study has been made on wind wave generation and on the interaction between wind-waves, paddle-waves and airflow in a tank containing a thin fish oil film uniformly spread on the water surface. According to the Marangoni resonance-type damping mechanism, for oily surfaces the energy dissipation process is quite selective in wavenumbers, but its effects are not, since it spreads (although to a lesser extent) towards longer and shorter waves via nonlinear interactions and modification of the airflow profile. With a thin layer of oil on the surface, it is rather peculiar that in the wind-only condition (no paddle waves) the wave field does not grow from the rest condition. This equilibrium was altered by paddle (longer) waves, the generation and evolution of short waves (in clean water and with oil) being modified by their interaction with the orbital velocity of the longer waves and their effect on the airflow. Paddle waves did grow under the action of wind, how much being similar in clean and oily water conditions, a fact we ascribe to the similar distortion of the wind profile in the two cases. We have also found that wind-supported stress on the oily water surface was able to generate a surface current, whose magnitude turns out to be comparable to the one in clean water. Our results expand previous investigations on the same topic. We stress the benefit of experiments with surfactants to explore in detail the physics at, and the exchanges across, the wavy and no-wavy air-water interface.

Alvise Benetazzo et al.
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Wave field in a wind tank: effect of a thin surface layer of fish oil. A. Benetazzo, L. Cavaleri, H. Ma, S. Jiang, F. Bergamasco, W. Jiang, S. Chen, and F. Qiao https://doi.org/10.5281/zenodo.1434262

Wave field in a wind and paddle tank: effect of a thin surface layer of fish oi A. Benetazzo, L. Cavaleri, H. Ma, S. Jiang, F. Bergamasco, W. Jiang, S. Chen, and F. Qiao https://doi.org/10.5281/zenodo.1434272

Alvise Benetazzo et al.
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Short summary
Inspired by the known virtue of fish oil to still angry seas, a study has been made on the interaction between wind-waves, paddle-waves and airflow in a tank containing a thin fish oil film. It is rather peculiar that in the wind-only condition the wave field does not grow from the rest condition. This equilibrium was altered by paddle waves. We stress the benefit of experiments with surfactants to explore in detail the physics at, and the exchanges across, the wavy air-water interface.
Inspired by the known virtue of fish oil to still angry seas, a study has been made on the...
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