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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">mgssuvest</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник МГСУ</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik MGSU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-0935</issn><issn pub-type="epub">2304-6600</issn><publisher><publisher-name>Moscow State University of Civil Engineering (National Research University) (MGSU)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22227/1997-0935.2023.8.1262-1271</article-id><article-id custom-type="elpub" pub-id-type="custom">mgssuvest-19</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>Гидравлика. Геотехника. Гидротехническое строительство</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Hydraulics. Geotechnique. Hydrotechnical construction</subject></subj-group></article-categories><title-group><article-title>Параметры водного потока на оси симметрии и крайней линии тока</article-title><trans-title-group xml:lang="en"><trans-title>Water Flow Parameters on the Symmetry Axis and Extreme Line of Current</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4288-8709</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бурцева</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Burtseva</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Александровна Бурцева — кандидат технических наук, доцент кафедры общеинженерных дисциплин</p><p>346428, г. Новочеркасск, ул. Просвещения, д. 132</p><p>РИНЦ ID: 161751, Scopus: 6507800801, ResearcherID: ABG-9531-2020</p></bio><bio xml:lang="en"><p>Olga A. Burtseva — Candidate of Technical Sciences, Assistant Professor, Associate Professor of the Department of General Engineering Disciplines</p><p>132 Prosveshcheniya st., Novocherkassk, 346428</p><p>ID RSCI: 161751, Scopus: 6507800801, ResearcherID: ABG-9531-2020 </p></bio><email xlink:type="simple">kuzinaolga@yandex.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/0000-0003-2901-7116</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Александрова</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Alexandrova</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мария Сергеевна Александрова — аспирант кафедры общеинженерных дисциплин</p><p>346428, г. Новочеркасск, ул. Просвещения, д. 132</p></bio><bio xml:lang="en"><p>Maria S. Alexandrova — postgraduate student of the Department General Engineering Disciplines</p><p>132 Prosveshcheniya st., Novocherkassk, 346428</p></bio><email xlink:type="simple">sergand1957@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Южно-Российский государственный политехнический университет (НПИ) имени М.И. Платова (ЮРГПУ (НПИ) имени М.И. Платова)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Platov South-Russian State Polytechnic University (NPI)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>29</day><month>08</month><year>2023</year></pub-date><volume>18</volume><issue>8</issue><fpage>1262</fpage><lpage>1271</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бурцева О.А., Александрова М.С., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Бурцева О.А., Александрова М.С.</copyright-holder><copyright-holder xml:lang="en">Burtseva O.A., Alexandrova M.S.</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.vestnikmgsu.ru/jour/article/view/19">https://www.vestnikmgsu.ru/jour/article/view/19</self-uri><abstract><sec><title>Введение</title><p>Введение. Проведен анализ математических моделей двумерных плановых потоков. Такие потоки характеризуются местными осредненными скоростями по глубине и местными глубинами в каждой точке потока. Формирование математической модели водного потока основано на его разделении на несколько участков. На этапе выхода потока из трубы имеется участок, где сохраняются постоянными параметры потока (скорость, глубина, ширина) — инерционный фронт. Определена цель статьи и ее актуальность.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Введением безразмерных комплексов и на основе π-теоремы выведена формула длины инерционного фронта водного потока при его растекании из прямоугольной трубы в широкое отводящее русло. Использована аналогия из газовой динамики, а именно переход в плоскость годографа скорости потока. С использованием годографа скорости получены законы распределения глубин и скоростей потока вдоль его продольной оси симметрии и вдоль крайней линии тока. Сформулированы основные задачи расчета параметров потока.</p></sec><sec><title>Результаты</title><p>Результаты. Описаны числовые расчеты сформулированных основных задач определения параметров потока. Приводится сравнение с экспериментальными данными и подтверждается адекватность уточненной математической модели двумерного планового потока.</p></sec><sec><title>Выводы</title><p>Выводы. Полученная формула длины инерционного фронта позволяет добиться желаемой погрешности расчета параметров водного потока. При расширениях потока до ٥ относительная погрешность ординат и скоростей потока не превышает 7–10 %. Расчетные формулы и реализованные программы позволят проектировщикам ГТС быстрее и точнее определить границы, скорость и глубину безнапорного потока над водопропускной трубой.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. An analysis of mathematical models of two-dimensional planned flows was carried out. Such flows are characterized by local depth-averaged velocities and local depths at each point of the flow. The mathematical model formation of the water flow is based on its division into several sections. There is a section where the flow parameters (velocity, depth, width) are kept constant at the stage of flow exit from the pipe — the inertial front. The purpose of the article and its relevance are defined.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. By introducing dimensionless complexes on the basis of π-theorem, the formula for the length of inertial front of the water flow at its spreading from a rectangular pipe into a wide diverting channel is derived. An analogy from gas dynamics is used, namely, the transition to the plane of the velocity hodograph. Using the velocity hodograph, the distribution of depths and velocities of the flow along its longitudinal axis of symmetry and along the extreme line of current was obtained. The main computation tasks for the flow parameters have been formulated.</p></sec><sec><title>Results</title><p>Results. Numerical calculations of the formulated main tasks for determining flow parameters are described. Comparison with experimental data is given and the adequacy of the refined mathematical model of a two-dimensional planned flow is confirmed.</p></sec><sec><title>Conclusions</title><p>Conclusions. The resulting formula for the length of the inertial front makes it possible to achieve the desired error in calculating the parameters of the water flow. With flow expansions up to 5, the relative error of the ordinates and flow velocities does not exceed 7–10 %. Calculation formulas and implemented programs will allow HTS designers to quickly and accurately determine the boundaries, speed and depth of free flow on the culvert.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>математическая модель</kwd><kwd>гидродинамический анализ</kwd><kwd>двумерный поток воды</kwd><kwd>гидравлика открытого канала</kwd><kwd>аналитическое решение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>mathematical model</kwd><kwd>hydrodynamics analysis</kwd><kwd>two-dimensional water flow</kwd><kwd>open-channel hydraulics</kwd><kwd>analytical solution</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают благодарность д.т.н., профессору Южно-Российского государственного политехнического университета (НПИ) имени М.И. Платова Виктору Николаевичу Коханенко за ряд замечаний, которые в дальнейшем были устранены. Авторы будут признательны рецензентам за замечания и советы, которые помогут улучшить статью, тем самым повысить ее уровень.</funding-statement><funding-statement xml:lang="en">The authors are grateful to Doctor of Technical Sciences, Professor of the South Russian State Polytechnic University (NPI) named after M.I. Platov Viktor Nikolaevich Kokhanenko for a number of remarks, which were subsequently eliminated. The authors will be grateful to the reviewers for comments and advice that will help improve the paper, thereby raising its level.</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">Шеренков И.А. Экспериментальные исследования растекания бурного потока за выходными оголовками водопропускных сооружений // Труды объединенного семинара по гидротехническому и водохозяйственному строительству. Харьков, 1958. Вып. 1. 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