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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">serp</journal-id><journal-title-group><journal-title xml:lang="ru">Эрозия почв и русловые процессы</journal-title><trans-title-group xml:lang="en"><trans-title>Soil erosion and river channel processes</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">3034-4638</issn><issn pub-type="epub">3033-9588</issn><publisher><publisher-name>Издательство "Наука</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.71367/3034-4638-2026-2-2-53-65</article-id><article-id custom-type="elpub" pub-id-type="custom">serp-73</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>Статьи</subject></subj-group></article-categories><title-group><article-title>АППРОКСИМАЦИЯ ПРОДОЛЬНОГО ПРОФИЛЯ ДОННЫХ ГРЯД ВЕТВЯМИ СИНУСОИДЫ</article-title><trans-title-group xml:lang="en"><trans-title>APPROXIMATION OF THE LONGITUDINAL PROFILE OF RIVER DUNES USING SINE WAVE BRANCHES</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>Замышляев</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Zamyshlyaev</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Замышляев Виталий Иванович, кандидат технических наук, старший научный сотрудник отдела русловых процессов</p><p>199004, Санкт-Петербург, 2-я линия В.О., д. 23</p><p>+7 921 967-1369</p></bio><bio xml:lang="en"><p>Zamyshlyaev Vitaly Ivanovich,  Candidate of technical sciences (PhD), Senior Researcher at the Department of Channel Processes</p><p>199004, Russian Federation, St. Petersburg, Vasilyevsky Island, 2nd line, 23</p><p>+7 921 967-1369</p></bio><email xlink:type="simple">viza51@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ «Государственный гидрологический институт»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>State Hydrological Institute</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>30</day><month>07</month><year>2026</year></pub-date><volume>0</volume><issue>2</issue><fpage>53</fpage><lpage>65</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Замышляев В.И., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Замышляев В.И.</copyright-holder><copyright-holder xml:lang="en">Zamyshlyaev V.I.</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://journal.sediment.ru/jour/article/view/73">https://journal.sediment.ru/jour/article/view/73</self-uri><abstract><p>Предложена математическая модель продольного профиля речных донных гряд, основанная на аппроксимации напорного склона и тылового откоса гряды двумя ветвями синусоиды с одинаковой амплитудой, но различными периодами и фазовыми сдвигами. В отличие от треугольной аппроксимации, модель обеспечивает гладкость (C¹-непрерывность) профиля во всех характерных точках – в подвальях и на гребне, что устраняет проблему сингулярности при гидродинамических расчетах. Получены аналитические выражения для описания профиля как в виде кусочно-заданной функции, так и в виде единой функции, определенной на всей оси абсцисс, что удобно для использования в теоретических моделях и численных расчетах. Показано, что площади под ветвями синусоид в точности равны площадям соответствующих треугольников, образованных хордами, что позволяет использовать простые оценки для объемных характеристик гряд. Для длин дуг, выражающихся через эллиптические интегралы, выполнены численные расчеты в широком диапазоне параметров крутизны и асимметрии. Установлено, что относительное превышение длины «синусоидального» профиля над «треугольным» составляет 2–4%, что может быть значимым при расчетах гидравлического сопротивления и транспорта наносов. Построены семейства параметрических графиков, описывающих основные геометрические характеристики «синусоидальной» гряды. Полученные результаты могут быть использованы при моделировании рельефа речного дна, оценке сопротивления русла и расчетах расхода донных наносов.</p></abstract><trans-abstract xml:lang="en"><p>mathematical model of the longitudinal profile of river dunes is proposed, based on the approximation of the stoss and lee sides of the dune by two sine wave branches with identical amplitudes but different periods and phase shifts. Unlike the triangular approximation, this model ensures profile smoothness (С1-continuity) at all characteristic points – at the crest and in the troughs – eliminating the singularity problem in hydrodynamic calculations. Analytical expressions are obtained to describe the profile both as a piecewise function and as a unified analytical function defined over the entire abscissa axis, which is convenient for use in theoretical models and numerical simulations. It is shown that the areas under the sine wave branches are exactly equal to the areas of the corresponding triangles formed by chords, allowing for the use of simple estimates for dune volume characteristics. For arc lengths expressed through elliptic integrals, numerical calculations were performed across a wide range of steepness and asymmetry parameters. It was established that the relative excess of the «sinusoidal» profile length over the «triangular» one is 2–4%, which can be significant in calculations of hydraulic resistance and sediment transport. Families of parametric plots describing the main geometric characteristics of the «sinusoidal» dune are constructed. The results obtained can be used for riverbed relief modeling, channel resistance assessment, and bedload discharge calculations.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>донные гряды</kwd><kwd>продольный профиль</kwd><kwd>синусоидальная аппроксимация</kwd><kwd>гладкость профиля</kwd><kwd>длина дуги</kwd><kwd>площадь сечения</kwd><kwd>крутизна гряды</kwd><kwd>асимметрия гряды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>river dunes</kwd><kwd>longitudinal profile</kwd><kwd>sinusoidal approximation</kwd><kwd>profile smoothness</kwd><kwd>arc length</kwd><kwd>cross-sectional area</kwd><kwd>dune steepness</kwd><kwd>dune asymmetry</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Барышников Н.Б. Динамика русловых потоков / Н.Б. Барышников. – СПб.: изд. РГГМУ, 2007. – 314 с.</mixed-citation><mixed-citation xml:lang="en">Allen J.R.L. 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