Доклады Академии наукДоклады Академии наук0869-5652The Russian Academy of Sciences1446210.31857/S0869-56524864475-479Research ArticleExcitation of seiches in ice at port water area of the sea of OkhotskDolgikhG. I.<p>Academician of the Russian Academy of Sciences</p>d.kovalev@imgg.ruKovalevD. P.d.kovalev@imgg.ruKovalevP. D.d.kovalev@imgg.ruPacific Oceanological Institute, Far Eastern Branch of the Russian Academy of SciencesInstitute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences1006201948644754792706201927062019Copyright © 2019, Russian academy of sciences2019<p>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.</p>seiches in icefast icechaosсейши подо льдомприпайный ледхаос[Guza R.T., Thornton E.B. // J. of Geophysical Res. 1980. V. 85. № C3. P. 1524-1530. DOI:10.1029/JC085iC03p01524][Mei C.C., Ünlüata U. // Waves on Beaches and Resulting Sediment Transport. N.Y. Academic.1972. Р. 181-202.][Манилюк Ю.В., Черкесов Л.В. // Мор. гидрофиз. журн. 2016. № 2. С. 16-26.][Rabinovich A.B. // Handbook of Coastal and Ocean Engineering. World scientific publishing company.Singapur. 2009. P. 193-236.DOI:10.1142/ 9789812819307_0009][Sorensen R.M., Thompson E.F. // Coastal Engineering Manual. Part II. Wash. (D.C.); N.Y.: U.S. Army Corps. Engineers, 2002. Ch. 7. P. 1-92.][Долгих Г.И., Будрин С.С., Долгих С.Г., Плотников А.А., Чупин В.А., Швец В.А., Яковенко С.В. // 2016. № 8. С. 57-63.][Долгих Г.И., Долгих С.Г., Смирнов С.В., Чупин В.А., Швец В.А., Яковенко С.В. // ДАН. 2011. Т. 441. № 1. С. 98-102.][Зырянов В. Н. //Водные ресурсы. 2011.Т. 38. № 3. С. 259-271.][Squire V.A., Dugan J.P., Wadhams P., Rottier P.J., Liu A.K. // Annual Rev. Fluid Mech. 1995. V. 27, P. 115-168. DOI: 10.1146/annurev.fl.27.010195.000555][Thompson J.M.T., Stewart H.B. Nonlinear dynamics and chaos. N.Y.: Wiley, 1986. 376 p.][Kovacic I., Brennan M.J. eds. The Duffing Equation: Nonlinear Oscillators and their Behaviour, Wiley, 2011, 392 p. ISBN 978-0-470-71549-9][Ковалев П.Д., Иволгин В.И. // Свидетельство регистрации программы для ЭВМ, Роспатент. № 2018665955от 11.12.2018]