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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">geomorf</journal-id><journal-title-group><journal-title xml:lang="ru">Геоморфология и палеогеография</journal-title><trans-title-group xml:lang="en"><trans-title>Geomorfologiya i Paleogeografiya</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2949-1789</issn><issn pub-type="epub">2949-1797</issn><publisher><publisher-name></publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31857/S2949178925030014</article-id><article-id custom-type="elpub" pub-id-type="custom">geomorf-3662</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>Экзогенная геоморфология</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Earth surface processes and landforms</subject></subj-group></article-categories><title-group><article-title>Формирование продольного профиля реки при существенном влиянии склоновых процессов (на примере р. Ваипаоа, Новая Зеландия)</article-title><trans-title-group xml:lang="en"><trans-title>The formation of river longitudinal profile under the significant influence of slope processes (on the example of the Waipaoa river, New Zealand)</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>Сидорчук</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidorchuk</surname><given-names>A. Yu.</given-names></name></name-alternatives><email xlink:type="simple">fluvial05@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет имени М. В. Ломоносова, географический факультет, Москва</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University, Faculty of Geography, Moscow</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>07</day><month>12</month><year>2025</year></pub-date><volume>56</volume><issue>3</issue><fpage>359</fpage><lpage>371</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сидорчук А.Ю., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Сидорчук А.Ю.</copyright-holder><copyright-holder xml:lang="en">Sidorchuk A.Y.</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://geomorphology.igras.ru/jour/article/view/3662">https://geomorphology.igras.ru/jour/article/view/3662</self-uri><abstract><p>Проведено исследование процессов аккумуляции наносов в верховьях реки при обильном поступлении наносов со склонов и последующего врезания реки в аккумулятивную толщу при прекращении подачи склоновых наносов. В качестве объекта исследования выбраны верховья р. Ваипаоа (Новая Зеландия), где такие процессы хорошо изучены, имеется морфометрическая, гидрологическая и седиментологическая информация. Применены численные методы решения уравнения деформации с использованием формулы К.В. Гришанина для расчета расхода влекомых наносов, региональные морфометрические зависимости и эмпирическая формула для скорости поступления наносов со склонов в верховья реки. Результатом является количественное описание как процессов аккумуляции наносов, так и процессов врезания в них речного потока. В условиях поступления наносов со склонов формировалась область аккумуляции наносов, которая во времени расширялась как вверх (регрессивно), так и вниз (трансгрессивно) по реке. Продольный профиль русла спрямлялся по хорде. Последующее врезание при прекращении подачи наносов происходило трансгрессивно, начиная с верхнего участка области аккумуляции. В результате формировалась цикловая хордовая терраса с уменьшением возраста вреза вниз по течению. В процессе врезания на поверхности террасы в средней и нижней частях шла аккумуляция наносов, которые, несмотря на последующий размыв, могли сохраниться в разрезе аллювиальной толщи. Применение численных методов позволяет проследить детали процессов формирования аккумулятивных отложений цикловых террас и врезания речных потоков в эти отложения.</p></abstract><trans-abstract xml:lang="en"><p>The article studies sediment accumulation processes in the upper reaches of a river with abundant sediment supply from slopes and subsequent river incision into the accumulative strata when the supply of slope sediments ceases. The object of study is the upper reaches of the Waipaoa River (New Zealand), where such processes are well studied and morphometric, hydrological and sedimentological information is available. The deformation equation using the Grishanin formula for calculating the transport rate of bedload was solved using numerical methods, regional morphometric relationships and an empirical formula for the rate of sediment supply from slopes to the head of the river. The result is a quantitative description of both sediment accumulation processes and the processes of river incision into them. Under conditions of sediment supply from slopes, a sediment accumulation area was formed, which expanded over time both upwards (regressively) and downwards (transgressively) along the river. The longitudinal profile of the channel straightened along the chord. Subsequent incision upon cessation of sediment supply occurred transgressively, starting from the upper section of the accumulation area. As a result, a cyclic chord terrace with time-transgressive downstream incision was formed. During the incision, sediments accumulated on the surface of the terrace in the middle and lower parts, which, despite subsequent erosion, could be preserved in the section of the alluvial layer. The use of numerical methods allows us to trace the details of the processes of formation of accumulative deposits of cyclic terraces and the incision of river flows into these deposits.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>уравнение деформации</kwd><kwd>численные методы</kwd><kwd>русло реки</kwd><kwd>поступление наносов со склонов</kwd><kwd>аккумуляция наносов</kwd><kwd>врезание русла</kwd><kwd>хордовая терраса</kwd></kwd-group><kwd-group xml:lang="en"><kwd>equation of deformation</kwd><kwd>numerical methods</kwd><kwd>river channel</kwd><kwd>sediment supply from slopes</kwd><kwd>sediment accumulation</kwd><kwd>channel incision</kwd><kwd>chord terrace</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено в рамках госбюджетной темы № 121051100166-4 “Гидрология, морфодинамика и геоэкология эрозионно-русловых систем”</funding-statement><funding-statement xml:lang="en">The study was done under the state budget task No. 121051100166-4 “Hydrology, morphodynamics and geoecology of erosion-channel systems”</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">Болиг А. 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