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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">vmait</journal-id><journal-title-group><journal-title xml:lang="ru">Computational Mathematics and Information Technologies</journal-title><trans-title-group xml:lang="en"><trans-title>Computational Mathematics and Information Technologies</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2587-8999</issn><publisher><publisher-name>Донской государственный технический университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.23947/2587-8999-2023-7-2-73-80</article-id><article-id custom-type="elpub" pub-id-type="custom">vmait-103</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>Mathematical Modelling (Математическое моделирование)</subject></subj-group></article-categories><title-group><article-title>Существование и единственность решения начально-краевой задачи транспорта многокомпонентных наносов прибрежных морских систем</article-title><trans-title-group xml:lang="en"><trans-title>Existence and Uniqueness of the Initial-Boundary Value Problem Solution of Multicomponent Sediments Transport in Coastal Marine Systems</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7744-015X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сидорякина</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidoryakina</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сидорякина Валентина Владимировна, доцент кафедры математики, кандидат физико-математических наук</p><p>347936, г. Таганрог, ул. Инициативная, 48</p><p>AuthorID: 124086</p><p>ScopusID: 57194681211</p></bio><bio xml:lang="en"><p>Valentina V Sidoryakina, Associate Professor of the Mathematics Department, PhD (Physical and Mathematical Sciences)</p><p>48, Initiative St., Taganrog, 347936</p><p>AuthorID: 124086</p><p>ScopusID: 57194681211</p></bio><email xlink:type="simple">cvv9@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Таганрогский институт им. А. П. Чехова (филиал) РГЭУ (РИНХ)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Taganrog Institute named after A. P. Chekhov (branch) of RSUE</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>13</day><month>07</month><year>2023</year></pub-date><volume>7</volume><issue>2</issue><fpage>73</fpage><lpage>80</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сидорякина В.В., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Сидорякина В.В.</copyright-holder><copyright-holder xml:lang="en">Sidoryakina V.V.</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://www.cmit-journal.ru/jour/article/view/103">https://www.cmit-journal.ru/jour/article/view/103</self-uri><abstract><sec><title>Введение</title><p>Введение. Настоящая работа посвящена исследованию нестационарной двумерной модели транспорта наносов в прибрежных морских системах. Модель учитывает сложный многокомпонентный состав наносов; действие силы тяжести и тангенциального напряжения, вызванного воздействием волн; турбулентный обмен; динамически изменяемый рельеф дна и другие факторы. Целью работы являлось проведение аналитического исследования условий существования и единственности начально-краевой задачи, соответствующей указанной модели.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. В работе на временной равномерной сетке выполнена линеаризация начально-краевой задачи, при которой нелинейные коэффициенты квазилинейного параболического уравнения берутся с «запаздыванием» на один шаг сетки. Тем самым строится цепочка задач, связанных по начальным условиям и финальным решениям. Привлекая методы математического и функционального анализа, а также методы решения дифференциальных уравнений, проводится исследование существования и единственности задач, входящих в данную цепочку, а потому и в целом исходной задачи.</p></sec><sec><title>Результаты исследования</title><p>Результаты исследования. На основе анализа существующих результатов математического моделирования гидродинамических процессов ранее была исследована нелинейная пространственно-двумерная модель транспорта наносов в случае донных отложений, состоящих из частиц, имеющих одинаковые характерные размеры и плотность (однокомпонентный состав). В настоящей работе предыдущие результаты исследования распространены на случай наносов многокомпонентного состава, а именно определены условия существования и единственности решения начально-краевой задачи, соответствующей рассматриваемой модели.</p></sec><sec><title>Обсуждение и заключения</title><p>Обсуждение и заключения. Модель транспорта многокомпонентных наносов может быть полезна для прогноза распространения загрязняющих веществ, а также при исследовании динамики изменения рельефа дна как при антропогенном воздействии, так и в силу естественно протекающих природных процессов в морских системах.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. This work is devoted to the study of a non-stationary two-dimensional model of sediment transport in coastal marine systems. The model takes into account the complex multi-fractional composition of sediments, the gravity effect and tangential stress caused by the impact of waves, turbulent exchange, dynamically changing bottom topography, and other factors. The aim of the work was to carry out an analytical study of the conditions for the initialboundary value problem existence and uniqueness corresponding to the specified model.</p></sec><sec><title>Materials and Methods</title><p>Materials and Methods. Linearization of the initial-boundary value problem is performed on a temporary uniform grid. The nonlinear coefficients of a quasilinear parabolic equation are taken with a “delay” by one grid step. Thus, a chain of correlated by initial conditions is the final solutions of problems is built. The study of the existence and uniqueness of the problems included in this chain, and therefore the original problem as a whole, is carried out involving the methods of mathematical and functional analysis, as well as methods for solving differential equations.</p></sec><sec><title>Results</title><p>Results. Earlier, the authors investigated the existence and uniqueness of the initial-boundary value problem of the transport of sediments of a single-component composition. In the present work, the result obtained is extended to the case of multi-fractional sediments.</p><p>Discussion and Conclusions. The non-linear spatial two-dimensional model of sediment transport was previously investigated by the team of authors in the case of bottom sediments consisting of particles having the same characteristic dimensions and density (single-component composition) based on the analysis of the existing results of mathematical modeling of hydrodynamic processes. In this paper, the previous results of the study are extended to the case of sediments of a multicomponent composition, namely, the conditions for the existence and uniqueness of the solution of the initial-boundary value problem corresponding to the considered model are determined.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>транспорт многокомпонентных наносов</kwd><kwd>прибрежная морская система</kwd><kwd>начально-краевая задача</kwd><kwd>существование решения</kwd><kwd>единственность решения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>multicomponent sediments’ transport</kwd><kwd>coastal marine system</kwd><kwd>initial-boundary value problem</kwd><kwd>solution existence</kwd><kwd>solution uniqueness</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда No. 23-21-00509, https://rscf.ru/project/23-21-00509</funding-statement><funding-statement xml:lang="en">The study was supported by the Russian Science Foundation grant no. 23-21-00509. https://rscf.ru/project/23-21-00509</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">Леонтьев И.О. 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