Excitation of seiches in ice at port water area of the sea of Okhotsk

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Abstract

Long term observations of sea waves with one second discreteness in the port harbor of Sea of Okhotsk (Sakhalin island) at a depth of about two meters under the ice were carried out using autonomous wave recorders in 2009-2017. Spectral analysis of the data showed the presence of several significant peaks on the periods from 2 to 15 seconds in the spectra for the moments of strong swell at sea. These peaks are caused by wave processes that are generated due to the nonlinear transformation of the swell coming in ice. The numerical simulation of the reaction of the dynamic system - the water area described by the Duffing equation, depending on the parameters included in the equation and determined from experimental observations, is carried out. It is shown, including using the Poincare mapping that the amplitude of external forcing has the greatest influence on the transition of the system to chaos.

About the authors

G. I. Dolgikh

Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences

Email: d.kovalev@imgg.ru

Academician of the Russian Academy of Sciences

Russian Federation, 43, Baltiyskaya Street, Vladivostok, 690041

D. P. Kovalev

Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences

Author for correspondence.
Email: d.kovalev@imgg.ru
Russian Federation, 1B, Nauka street, Yuzhno-Sakhalinsk, 693022

P. D. Kovalev

Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences

Email: d.kovalev@imgg.ru
Russian Federation, 1B, Nauka street, Yuzhno-Sakhalinsk, 693022

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