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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Russian Journal of Earth Sciences</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Russian Journal of Earth Sciences</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Russian Journal of Earth Sciences</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="online">1681-1208</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">65624</article-id>
   <article-id pub-id-type="doi">10.2205/2023ES000869</article-id>
   <article-id pub-id-type="edn">byeymh</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>ORIGINAL ARTICLES</subject>
    </subj-group>
    <subj-group>
     <subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Specific Features of Internal Waves Manifestation in the Near Mouth Zone of the Danube by High-ResolutionSatellite Data</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Особенности проявления внутренних волн в приустьевой зоне Дуная по спутниковым данным высокого разрешения</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7856-623X</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Медведева</surname>
       <given-names>Алеся Викторовна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Medvedeva</surname>
       <given-names>Alesia Viktorovna</given-names>
      </name>
     </name-alternatives>
     <email>Suomi-NPP@mail.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8696-9722</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Михайличенко</surname>
       <given-names>Тамара Витальевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Mikhailichenko</surname>
       <given-names>Tamara Vitalievna</given-names>
      </name>
     </name-alternatives>
     <email>goldpineapple2020@gmail.com</email>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1033-5678</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Станичный</surname>
       <given-names>Сергей Владимирович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Stanichny</surname>
       <given-names>Sergey Vladimirovich</given-names>
      </name>
     </name-alternatives>
     <email>sstanichny@mail.ru</email>
     <bio xml:lang="ru">
      <p>кандидат физико-математических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>candidate of physical and mathematical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-3"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4390-4013</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Булатов</surname>
       <given-names>Виталий Васильевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Bulatov</surname>
       <given-names>Vitaly Vasiljevich</given-names>
      </name>
     </name-alternatives>
     <email>internalwave@mail.ru</email>
     <bio xml:lang="ru">
      <p>доктор физико-математических наук;доктор экономических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>doctor of physical and mathematical sciences;doctor of economic sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-4"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Федеральный исследовательский центр «Морской гидрофизический институт РАН»</institution>
     <city>Севастополь</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Federal State Budget Scientific Institution Federal Research Centre «Marine Hydrophysical Institute of RAS»</institution>
     <city>Sevastopol</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Федеральный исследовательский центр «Морской гидрофизический институт РАН»</institution>
     <city>Севастополь</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Federal State Budget Scientific Institution Federal Research Centre «Marine Hydrophysical Institute of RAS»</institution>
     <city>Sevastopol</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Федеральный исследовательский центр «Морской гидрофизический институт РАН»</institution>
     <city>Севастополь</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Federal State Budget Scientific Institution Federal Research Centre «Marine Hydrophysical Institute of RAS»</institution>
     <city>Sevastopol</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-4">
    <aff>
     <institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Института проблем механики им. А. Ю. Ишлинского Российской академии наук</institution>
     <city>Москва</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Ishlinsky Institute for Problems in Mechanics RAS</institution>
     <city>Moscow</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2023-12-30T00:00:00+03:00">
    <day>30</day>
    <month>12</month>
    <year>2023</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2023-12-30T00:00:00+03:00">
    <day>30</day>
    <month>12</month>
    <year>2023</year>
   </pub-date>
   <volume>23</volume>
   <issue>6</issue>
   <fpage>1</fpage>
   <lpage>13</lpage>
   <history>
    <date date-type="received" iso-8601-date="2023-06-19T00:00:00+03:00">
     <day>19</day>
     <month>06</month>
     <year>2023</year>
    </date>
    <date date-type="accepted" iso-8601-date="2023-08-30T00:00:00+03:00">
     <day>30</day>
     <month>08</month>
     <year>2023</year>
    </date>
   </history>
   <self-uri xlink:href="https://rjes.ru/en/nauka/article/65624/view">https://rjes.ru/en/nauka/article/65624/view</self-uri>
   <abstract xml:lang="ru">
    <p>Для приустьевой зоны Дуная рассмотрены механизмы проявления внутренних волн в спутниковых данных оптического диапазона. Выделены 3 основных механизма проявления внутренних волн – ранее описанные динамический (за счет изменения шероховатости морской поверхности в конвергентных зонах, создаваемых движущейся внутренней волной), сликовый – когда в зонах конвергенции скапливаются поверхностно активные вещества, и новый – за счет изменения яркости морской поверхности при модуляции внутренней волной толщины рассеивающего слоя. Для анализа были использованы данные сканера OLI Landsat-8 за 2015–2019 годы. Показано, что в различных ситуациях внутренние волны могут проявляться либо за счет различных механизмов, либо только за счет какого-то одного. Построены суммарные карты проявлений внутренних волн в исследуемом районе. Дополнительно рассмотрены ситуации с квазисинхронными данными MSI Sentinel-2 и C-SAR Sentinel-1, на которых отображались пакеты внутренних волн. Подбор таких пар позволил оценить фазовые скорости внутренних волн, которые составили от 0,05 м/с (0,19 км/ч) до 0,95 м/с (3,43 км/ч) в различных гидрометеорологических ситуациях. Представлены примеры трансформации фронта внутренних волн на субмезомасштабных вихрях.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>The mechanisms of manifestation of internal waves in satellite data of the optical range are considered for the mouth area of the Danube. Three main mechanisms for the manifestation of internal waves are identified – the previously described dynamic (due to a change in the roughness of the sea surface in convergent zones created by a moving internal wave), slick – when surfactants accumulate in convergence zones, and a new one – change in the brightness of the sea surface defined by scattering layer thickness modulation by internal waves. Data from the OLI Landsat-8 scanner for 2015–2019 were used for the analysis. It is shown that in different situations, internal waves can manifest themselves either due to various mechanisms or only due to one of them. Summary maps of manifestations of internal waves in the study area were constructed. Additionally, the situations with quasi-synchronous data of MSI Sentinel-2 and C-SAR Sentinel-1, which displayed the same packets of internal waves, are considered. The selection of such pairs made it possible to estimate the phase velocities of internal waves, which ranged from 0.05 m/s (0.19 km/h) to0.95 m/s (3.43 km/h) in various hydrometeorological situations. Examples of internal wavefront transformation on submesoscale eddies are presented.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>Черное море</kwd>
    <kwd>Дунай</kwd>
    <kwd>устье Дуная</kwd>
    <kwd>спектральные характеристики</kwd>
    <kwd>внут-ренние волны</kwd>
    <kwd>оптические изображения</kwd>
    <kwd>спутниковые данные</kwd>
    <kwd>скорости внутренних волн</kwd>
    <kwd>OLI Landsat-8</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>Black Sea</kwd>
    <kwd>Danube</kwd>
    <kwd>Danube mouth</kwd>
    <kwd>spectral characteristics</kwd>
    <kwd>internal waves</kwd>
    <kwd>opticalimages</kwd>
    <kwd>satellite data</kwd>
    <kwd>internal wave velocities</kwd>
    <kwd>OLI Landsat-8</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке гранта РНФ No23-21-00194 «Аналитические методы математического моделирования волновой динамики неоднородных гидрофизических сред»</funding-statement>
    <funding-statement xml:lang="en">The work was carried out with the financial support of the Russian Science Foundation grant No. 23-21-00194 “Analytical methods of mathematical modeling of wave dynamics of inhomogeneous hydrophysical media”</funding-statement>
   </funding-group>
  </article-meta>
 </front>
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 </body>
 <back>
  <ref-list>
   <ref id="B1">
    <label>1.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Иванов В. А., Серебряный А. Н. Короткопериодные внутренние волны в прибрежной зоне бесприливного моря // Известия Академии наук СССР. Физика атмосферы и океана. — 1985. — Т. 21, No 6. — С. 648—656.</mixed-citation>
     <mixed-citation xml:lang="en">Alpers W. Theory of radar imaging of internal waves // Nature. — 1985. — Vol. 314, no. 6008. — P. 245–247. — DOI: 10.1038/314245a0.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B2">
    <label>2.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Лаврова О. Ю., Митягина М. И., Сабинин К. Д. Возможные механизмы генерации внутренних волн в северо-восточной части Черного моря // Современные проблемы дистанционного зондирования Земли из космоса. —2008. — Т. 2, No 5. — С. 128—136.</mixed-citation>
     <mixed-citation xml:lang="en">Bondur V. G., Sabinin K. D., Grebenyuk Y. V. Generation of inertia-gravity waves on the island shelf // Izvestiya, Atmospheric and Oceanic Physics. — 2015. — Vol. 51, no. 2. — P. 208–213. — DOI: 10.1134/S0001433815020036.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B3">
    <label>3.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Митягина М. И., Лаврова О. Ю. Спутниковые наблюдения поверхностных проявлений внутренних волн в морях без приливов // Современные проблемы дистанционного зондирования Земли из космоса. — 2010. — Т. 7, No 1. —С. 260—272.</mixed-citation>
     <mixed-citation xml:lang="en">Bondur V. G., Serebryany A. N., Zamshin V. V.,et al.Intensive Internal Waves with Anomalous Heights in the BlackSea Shelf Area // Izvestiya, Atmospheric and Oceanic Physics. — 2019. — Vol. 55, no. 1. — P. 99–109. — DOI: 10.1134/S000143381901002X.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B4">
    <label>4.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Серебряный А. Н., Иванов В. А. Исследования внутренних волн в Черном море с океанографической платформы МГИ // Фундаментальная и прикладная гидрофизика. — 2013. — Т. 6, No 3. — С. 34—45.</mixed-citation>
     <mixed-citation xml:lang="en">Bulatov V. V., Ponomarev A. N. About the Possibility of Improving the Image Quality of Laser Location in the Process of Remote Sensing of the Water Surface // Processes in GeoMedia-Volume VI. — Springer International Publishing,2023. — P. 277–282. — DOI: 10.1007/978-3-031-16575-7_26.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B5">
    <label>5.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Alpers W. Theory of radar imaging of internal waves // Nature. — 1985. — Vol. 314, no. 6008. — P. 245–247. — DOI: 10.1038/314245a0.</mixed-citation>
     <mixed-citation xml:lang="en">Copernicus Open Access Hub. — URL: https://scihub.copernicus.eu/dhus/%5C#/home (visited on 2022).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B6">
    <label>6.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Bondur V. G., Sabinin K. D., Grebenyuk Y. V. Generation of inertia-gravity waves on the island shelf//Izvestiya, Atmospheric and Oceanic Physics. — 2015. — Vol. 51, no. 2. — P. 208–213. — DOI: 10.1134/S0001433815020036.</mixed-citation>
     <mixed-citation xml:lang="en">Eckart C. Internal Waves in the Ocean//The Physics of Fluids. — 1961. — Vol. 4, no. 7. — P. 791–799. — DOI: 10.1063/1.1706408.EOSDIS.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B7">
    <label>7.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Bondur V. G., Serebryany A. N., Zamshin V. V.,et al.Intensive Internal Waves with Anomalous Heights in the BlackSea Shelf Area // Izvestiya, Atmospheric and Oceanic Physics. — 2019. — Vol. 55, no. 1. — P. 99–109. — DOI: 10.1134/S000143381901002X.</mixed-citation>
     <mixed-citation xml:lang="en">Worldview. — URL: https://worldview.earthdata.nasa.gov/ (visited on 2022).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B8">
    <label>8.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Bulatov V. V., Ponomarev A. N. About the Possibility of Improving the Image Quality of Laser Location in the Process of Remote Sensing of the Water Surface//Processes in GeoMedia-Volume VI. — Springer International Publishing,2023. — P. 277–282. — DOI: 10.1007/978-3-031-16575-7_26.</mixed-citation>
     <mixed-citation xml:lang="en">Ivanov V. A., Serebryany A. N. Short-period internal waves in the coastal zone of a tidal sea // Izvestiya USSR Academy of Sciences. Physics of the atmosphere and ocean. — 1985. — Vol. 21, no. 6. — P. 648–656.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B9">
    <label>9.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Copernicus Open Access Hub. — URL: https://scihub.copernicus.eu/dhus/%5C#/home (visited on 2022).</mixed-citation>
     <mixed-citation xml:lang="en">Ivanov V. A., Shul’ga T. Y., Bagaev A. V.,et al. Internal Waves on the Black Sea Shelf near the Heracles Peninsula: Modeling and Observation // Physical Oceanography. — 2019. — Vol. 26, no. 4. — DOI: 10.22449/1573-160X-2019-4-288-304.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B10">
    <label>10.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Eckart C. Internal Waves in the Ocean//The Physics of Fluids. — 1961. — Vol. 4, no. 7. — P. 791–799. — DOI: 10.1063/1.1706408.</mixed-citation>
     <mixed-citation xml:lang="en">Khimchenko E., Ostrovskii A., Klyuvitkin A., et al. Seasonal Variability of Near-Inertial Internal Waves in the Deep Central Part of the Black Sea // Journal of Marine Science and Engineering. — 2022. — Vol. 10, no. 5. — P. 557. —DOI: 10.3390/jmse10050557.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B11">
    <label>11.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">EOSDIS. Worldview. — URL: https://worldview.earthdata.nasa.gov/ (visited on 2022).</mixed-citation>
     <mixed-citation xml:lang="en">Lavrova O., Mityagina M. Satellite Survey of Internal Waves in the Black and Caspian Seas // Remote Sensing. — 2017. —Vol. 9, no. 9. — P. 892. — DOI: 10.3390/rs9090892.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B12">
    <label>12.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ivanov V. A., Shul’ga T. Y., Bagaev A. V., et al. Internal Waves on the Black Sea Shelf near the Heracles Peninsula: Modeling and Observation // Physical Oceanography. — 2019. — Vol. 26, no. 4. — DOI: 10.22449/1573-160X-2019-4-288-304.</mixed-citation>
     <mixed-citation xml:lang="en">Lavrova O. Y., Mityagina M. I., Sabinin K. D. Possible mechanisms for generating internal waves in the northeastern part of the Black Sea // Sovremennyye problemy distantsionnogo zondirovaniya Zemli iz kosmosa. — 2008. — Vol. 2,no. 5. — P. 128–136.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B13">
    <label>13.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Khimchenko E., Ostrovskii A., Klyuvitkin A.,et al. Seasonal Variability of Near-Inertial Internal Waves in the Deep Central Part of the Black Sea//Journal of Marine Science and Engineering. — 2022. — Vol. 10, no. 5. — P. 557. —DOI: 10.3390/jmse10050557.</mixed-citation>
     <mixed-citation xml:lang="en">Lavrova O. Y., Mityagina M. I., Serebryany A. N.,et al.Internal waves in the Black Sea: satellite observations and in-situmeasurements // Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014. — SPIE,2014. — DOI: 10.1117/12.2067047.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B14">
    <label>14.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Lavrova O., Mityagina M. Satellite Survey of Internal Waves in the Black and Caspian Seas//Remote Sensing. —2017. — Vol. 9, no. 9. — P. 892. — DOI: 10.3390/rs9090892.</mixed-citation>
     <mixed-citation xml:lang="en">Mityagina M. I., Lavrova O. Y. Radar survey of internal waves surface manifestations in non-tidal seas // Sovremennyye problemy distantsionnogo zondirovaniya Zemli iz kosmosa. — 2010. — Vol. 7, no. 1. — P. 260–272.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B15">
    <label>15.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Lavrova O. Y., Mityagina M. I., Serebryany A. N.,et al. Internal waves in the Black Sea: satellite observations and in-situ measurements // Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014. — SPIE,2014. — DOI: 10.1117/12.2067047.</mixed-citation>
     <mixed-citation xml:lang="en">Nash J. D., Moum J. N. River plumes as a source of large-amplitude internal waves in the coastal ocean // Nature. —2005. — Vol. 437, no. 7057. — P. 400–403. — DOI: 10.1038/nature03936.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B16">
    <label>16.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Nash J. D., Moum J. N. River plumes as a source of large-amplitude internal waves in the coastal ocean // Nature. —2005. — Vol. 437, no. 7057. — P. 400–403. — DOI: 10.1038/nature03936.</mixed-citation>
     <mixed-citation xml:lang="en">Navionics. — URL: https://www.navionics.com/ (visited on 2022).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B17">
    <label>17.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Navionics. — URL: https://www.navionics.com/ (visited on 2022).</mixed-citation>
     <mixed-citation xml:lang="en">Robinson I. S. Measuring the oceans from space: The Principles and Methods of Satellite Oceanography. — Springer,2004. — 716 p.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B18">
    <label>18.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Robinson I. S. Measuring the oceans from space: The Principles and Methods of Satellite Oceanography. — Springer,2004. — 716 p.</mixed-citation>
     <mixed-citation xml:lang="en">Sabinin K. D., Serebryanyi A. N., Nazarov A. A. Intensive internal waves in the World Ocean // Oceanology. — 2004. —Vol. 44, no. 6. — P. 753–758.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B19">
    <label>19.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Sabinin K. D., Serebryanyi A. N., Nazarov A. A. Intensive internal waves in the World Ocean//Oceanology. — 2004. —Vol. 44, no. 6. — P. 753–758.</mixed-citation>
     <mixed-citation xml:lang="en">Sentinelhub Playground. — URL: https://apps.sentinel-hub.com/sentinel-playground/ (visited on 2022).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B20">
    <label>20.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Sentinelhub Playground. — URL: https://apps.sentinel-hub.com/sentinel-playground/ (visited on 2022).</mixed-citation>
     <mixed-citation xml:lang="en">Serebryany A. N., Ivanov V. A. Study of Internal Waves in the Black Sea from Oceanography Platform of Marine Hydrophysical Institute // Fundamental and applied hydrophysics. — 2013. — Vol. 6, no. 3. — P. 34–45.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B21">
    <label>21.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">USGS. EarthExplorer. — URL: https://earthexplorer.usgs.gov/ (visited on 2022).</mixed-citation>
     <mixed-citation xml:lang="en">USGS. EarthExplorer. — URL: https://earthexplorer.usgs.gov/ (visited on 2022).</mixed-citation>
    </citation-alternatives>
   </ref>
  </ref-list>
 </back>
</article>
