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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">hydrophysics</journal-id><journal-title-group><journal-title xml:lang="ru">Фундаментальная и прикладная гидрофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Fundamental and Applied Hydrophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-6673</issn><issn pub-type="epub">2782-5221</issn><publisher><publisher-name>St. Petersburg Research Center of the Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.59887/2073-6673.2025.18(1)-3</article-id><article-id custom-type="elpub" pub-id-type="custom">hydrophysics-1414</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФУНДАМЕНТАЛЬНЫЕ ВОПРОСЫ ГИДРОФИЗИКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>FUNDAMENTAL ISSUES OF HYDROPHYSICS</subject></subj-group></article-categories><title-group><article-title>Модовая трансформация волн на поверхности жидкости, покрытой упругой пленкой конечной толщины</article-title><trans-title-group xml:lang="en"><trans-title>Mode transformation of waves on the surface of a liquid covered by an elastic film of finite thickness</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8870-2047</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сергиевская</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sergievskaya</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергиевская Ирина Андреевна, заведующий лабораторией, кандидат физико-математических наук</p><p>Scopus AuthorID: 6602742495, WoS ResearcherID: L-6146-2017 </p><p>903950, Нижний Новгород, ул. Ульянова, д. 46 </p><p>903950, Нижний Новгород, ул. Нестерова, д. 5 </p></bio><bio xml:lang="en"><p>Scopus AuthorID: 6602742495, WoS ResearcherID: L-6146-2017 </p><p>46 Ulyanova Str., Nizhny Novgorod 903950 </p><p>5 Nesterova Str. Nizhny Novgorod 903950 </p></bio><email xlink:type="simple">i.sergia@ipfran.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0869-4954</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ермаков</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ermakov</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ермаков Станислав Александрович, заведующий отделом, старший научный сотрудник, доктор физико-математических наук</p><p>Scopus AuthorID: 7006796194, WoS ResearcherID: L-6157-2017</p><p>903950, Нижний Новгород, ул. Ульянова, д. 46 </p><p>903950, Нижний Новгород, ул. Нестерова, д. 5 </p></bio><bio xml:lang="en"><p>Scopus AuthorID: 7006796194, WoS ResearcherID: L-6157-2017</p><p>46 Ulyanova Str., Nizhny Novgorod 903950 </p><p>5 Nesterova Str. Nizhny Novgorod 903950 </p></bio><email xlink:type="simple">stas.ermakov@ipfran.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0674-4831</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лазарева</surname><given-names>Т. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Lazareva</surname><given-names>T. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лазарева Татьяна Николаевна, ведущий программист</p><p>Scopus AuthorID: 54884797800, WoS ResearcherID: AAJ-4607-2021</p><p>903950, Нижний Новгород, ул. Ульянова, д. 46 </p></bio><bio xml:lang="en"><p>Scopus AuthorID: 54884797800, WoS ResearcherID: AAJ-4607-2021</p><p>46 Ulyanova Str., Nizhny Novgorod 903950 </p></bio><email xlink:type="simple">lazareva@ipfran.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт прикладной физики им. А. В. Гапонова-Грехова РАН ; Волжский государственный университет водного транспорта<country>Россия</country></aff><aff xml:lang="en">A. V. Gaponov-Grekhov Institute of Applied Physics RAS ; Volga State University of Water Transport<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Институт прикладной физики им. А. В. Гапонова-Грехова РАН<country>Россия</country></aff><aff xml:lang="en">A. V. Gaponov-Grekhov Institute of Applied Physics RAS<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>28</day><month>04</month><year>2025</year></pub-date><volume>18</volume><issue>1</issue><fpage>31</fpage><lpage>40</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сергиевская И.А., Ермаков С.А., Лазарева Т.Н., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Сергиевская И.А., Ермаков С.А., Лазарева Т.Н.</copyright-holder><copyright-holder xml:lang="en">Sergievskaya I.A., Ermakov S.A., Lazareva T.N.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://hydrophysics.spbrc.ru/jour/article/view/1414">https://hydrophysics.spbrc.ru/jour/article/view/1414</self-uri><abstract><p>Исследование подавления поверхностных волн пленками нефтепродуктов и биогенными пленками в областях катастрофического цветения фитопланктона является актуальной задачей в приложении к проблеме дистанционной диагностики загрязнений на морской поверхности. Особенностью таких пленок по сравнению с хорошо изученным случаем квазимономолекулярных пленок поверхностно-активных веществ является значительная (порядка и более 1 мкм) толщина пленки, последнюю в этом случае описывают как слой вязкой жидкости. В работе в рамках линейной теории исследовано затухание волн на поверхности воды, покрытой слоем другой вязкой жидкости конечной толщины с упругой границей между ними. Численно проанализированы особенности двух разных типов волновых мод, которые в пределе бесконечно тонкой пленки характеризуются как поперечные (гравитационно-капиллярные волны, ГКВ) и продольные (волны Марангони, ВМ). Проанализирована эволюция этих мод с ростом толщины верхнего слоя вплоть до толщин, много больших толщины вязкого подслоя, в пленке. Показано, что в некотором интервале упругостей границы раздела, определяемым длиной волны и вязкостью жидкостей, при толщине верхнего слоя порядка толщины вязкого подслоя в пленке, происходит взаимная трансформация мод. Именно волна, которая была ГКВ для бесконечно тонкой пленки, при толщинах пленки, превышающих толщину вязкого подслоя, переходит в ВМ, и наоборот. Этот эффект возникает из-за того, что ГКВ и ВМ не являются ни чисто гравитационно-капиллярными, ни чисто дилатационными. Лабораторные эксперименты показали хорошее согласие с результатами численного анализа и подтвердили существование эффекта модовой трансформации.</p></abstract><trans-abstract xml:lang="en"><p>The study of surface wave suppression due to oil product films and biogenic films in areas of catastrophic phytoplankton blooms is an important task in application to the problem of remote diagnostics of pollution on the sea surface. The peculiarity of such films in comparison with the well-studied case of quasi-monomolecular films of surfactants is a significant (on the order of or more than 1 micron) film thickness, the latter in this case is described as a layer of viscous liquid. This paper investigates wave damping on a water surface covered by a layer of another viscous fluid of finite thickness with an elastic boundary between them within the framework of linear theory. The features of two different types of wave modes, which for infinitely thin film are characterized as transverse (gravitational-capillary waves, GCW) and longitudinal (Marangoni waves, MW), are numerically analyzed. The evolution of these modes with increasing thickness of the top layer up to thicknesses much larger than the thickness of the viscous sublayer in the film is analyzed. It is shown that in some interval of interface elasticity, determined by the wavelength and viscosity of the top layer, a mutual transformation of the modes occurs at the thickness of the layer of the order of viscous sublayer thickness in the film. Namely, a wave that was GCW for an infinitely thin film, at film thicknesses greater than the thickness of the viscous sublayer, transitions to a MW, and vice versa. This effect arises because the GCW and MW are neither purely gravity-capillary nor purely dilatational. Laboratory experiments showed good agreement with the numerical results and confirmed the existence of the mode transformation effect.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гравитационно-капиллярные волны</kwd><kwd>волны Марангони</kwd><kwd>двухслойная жидкость</kwd><kwd>упругая пленка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>gravity-capillary waves</kwd><kwd>Marangoni waves</kwd><kwd>two-layer fluid</kwd><kwd>elastic film</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа в части численного моделирования ГКВ и ВМ, а также анализ и обсуждения результатов моделирования выполнено при финансовой поддержке РНФ (грант № 23-17-00167), лабораторные эксперименты проведены в рамках госзадания ИПФ РАН FFUF-2024-0033.</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The research in the part of the numerical model and numerical results, as well as discussion was carried out under the financial support of the Russian Science Foundation (Grant № 23-17-00167), laboratory experiments were performed within the framework of the State Assignment of IPF RAS FFUF-2024-0033.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Alpers W, Huehnerfuss H. 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