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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 custom-type="elpub" pub-id-type="custom">hydrophysics-860</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>Трансформация поверхностных и внутренних волн над донным уступом. Обзор</article-title><trans-title-group xml:lang="en"><trans-title>Transformation of Surface and Internal Waves Over the Bottom Step. Review</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Куркин</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurkin</surname><given-names>A. A.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сёмин</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Semin</surname><given-names>S. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Степанянц</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Stepanyants</surname><given-names>Y. A.</given-names></name></name-alternatives><email xlink:type="simple">Yury.Stepanyants@usq.edu.au</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Нижегородский государственный технический университет им. Р. Е. Алексеева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Nizhny Novgorod State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Нижегородский государственный технический университет им. Р. Е. Алексеева; Университет Южного Квинсленда</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Nizhny Novgorod State Technical University; University of Southern Queensland</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>19</day><month>11</month><year>2022</year></pub-date><volume>8</volume><issue>3</issue><fpage>3</fpage><lpage>19</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Куркин А.А., Сёмин С.В., Степанянц Ю.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Куркин А.А., Сёмин С.В., Степанянц Ю.А.</copyright-holder><copyright-holder xml:lang="en">Kurkin A.A., Semin S.V., Stepanyants Y.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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/860">https://hydrophysics.spbrc.ru/jour/article/view/860</self-uri><abstract><p>Представлен краткий обзор работ по трансформации поверхностных и внутренних гравитационных волн над донным уступом. Обсуждается обобщение известных формул Лэмба для расчета коэффициентов трансформации, полученных в длинноволновом приближении, на случай волн произвольной длины в жидкости конечной глубины. Дано описание строго подхода к расчету коэффициентов трансформации в линейном приближении как для поверхностных, так и для внутренних волн в двухслойной жидкости и отмечены трудности, связанные с использованиием этого подхода. Рассмотрены различные приближенные подходы и их соответствие строгой теории, а также экспериментальным и численным данным. В рамках строгого подхода приведены расчеты не только коэффициентов трансформации бегущих волн, но также и коэффициентов возбуждения прижатых к уступу волн. Найдено, что длина несущей волны узкополосного пакета после прохождения над уступом изменяется пропорционально фазовой скорости, а длина огибающей изменяется пропорционально групповой скорости. Представлено сравнение теоретических результатов с численными данными и лабораторными экспериментами.</p></abstract><trans-abstract xml:lang="en"><p>A brief overview of works on transformation of surface and internal gravity waves over a bottom step is presented. The generalization of Lamb formulae for the transformation coefficients derived in the longwave approximation is discussed for waves of arbitrary length in the fluid of a finite length. The rigorous approach to calculate the transformation coefficients in the linear approximation is described both for the surface and internal waves in two-layer fluid. The problems associated with the application of the rigorous approach are noticed. The various approximate approaches are considered, as well as their compliance with the rigorous theory and numerical and experimental results. Within the framework of the rigorous approach the transformation coefficients of travelling waves and the excitation coefficients of evanescent modes are calculated. It is shown that wavelength of a quasi-monochromatic wavetrain changes after transformation on a bottom step proportionally to the phase speed, whereas the length of the envelope changes proportionally to the group speed. A comparison of theoretical results with numerical data and laboratory experiments is presented. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>волны на воде</kwd><kwd>внутренние волны</kwd><kwd>трансформация волн</kwd><kwd>коэффициент прохождения</kwd><kwd>коэффициент отражения</kwd><kwd>волновой пакет</kwd><kwd>трансформация волн на шельфе</kwd></kwd-group><kwd-group xml:lang="en"><kwd>water waves</kwd><kwd>internal waves</kwd><kwd>wave transformation</kwd><kwd>transmission coefficient</kwd><kwd>reflection coefficient</kwd><kwd>wave packet</kwd><kwd>waves transformation on the shelf</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Представленные результаты получены в рамках выполнения государственного задания в сфере научной деятельности (Задание № 2014/133 («организация проведения научных исследований») и Задание № 5.30.2014/K)</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">Ламб Г. 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