Macro-Turbulent Flow and Its Impacts on Sediment Transport Potential of a Subarctic River during Ice-Covered and Open-Channel Conditions
| العنوان: | Macro-Turbulent Flow and Its Impacts on Sediment Transport Potential of a Subarctic River during Ice-Covered and Open-Channel Conditions |
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| المؤلفون: | Petteri Alho, Maria Kämäri, Eliisa Lotsari, Elina Kasvi, Michael Dietze |
| المصدر: | Water Volume 12 Issue 7 Water, Vol 12, Iss 1874, p 1874 (2020) |
| بيانات النشر: | Multidisciplinary Digital Publishing Institute, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | veden virtaus, lcsh:Hydraulic engineering, 010504 meteorology & atmospheric sciences, Water flow, vaikutukset, 0208 environmental biotechnology, Geography, Planning and Development, ice, vesi, sedimentit, 02 engineering and technology, ice-covered, 01 natural sciences, Biochemistry, Physics::Fluid Dynamics, macro-turbulence, lcsh:Water supply for domestic and industrial purposes, open-channel flow, Physics::Atmospheric and Oceanic Physics, Water Science and Technology, makroturbulenssi, vuodenajat, geography.geographical_feature_category, seasons, Turbulence, avoimen kanavan virtaus, ADCP, 6. Clean water, Flow conditions, flow, ice-covered flow, Sediment transport, jääpeitteinen virtaus, joet, nopeus, velocity, water, water flow, subarktinen, Aquatic Science, Physics::Geophysics, Acoustic Doppler current profiler, lcsh:TC1-978, virtaus, impacts, 0105 earth and related environmental sciences, Hydrology, macro-turbulent flow, open-channel, geography, lcsh:TD201-500, jää, subarctic, Inlet, 020801 environmental engineering, Open-channel flow, 2016-2020, subarctic river, sediment, 13. Climate action, Meander, Environmental science, klusterianalyysi, cluster analysis |
| الوصف: | Macro-turbulent flows (i.e., coherent flow structures reaching through the whole water column), have not been studied widely in northern seasonally frozen rivers during both open-channel and ice-covered flow conditions. Thus, we aim: (1) to detect and compare the macro-turbulent flow, both at open-channel and ice-covered flow conditions (2) to explore spatial variation of macro-turbulent flow characteristics within a meander bend and (3) to detect the effects of near-bed layer velocity fluctuation on bedload transport during differing overall flow conditions. The analyses are based on 5&ndash 10 min-long acoustic Doppler current profiler (ADCP) measurements from a subarctic river. The ice-covered low flow, and open-channel higher and lower flow conditions were measured over the period of 2016 to 2020. This study found that macro-turbulent flow existed at all measurement locations under both open-channel and ice-covered flow conditions. Macro-turbulent flow was most consistent and obvious in the streamwise velocity component, and in particular at the inlet and outlet of the investigated meander bend. During all seasons, the near-bed velocities consistently exceeded the sufficient amount for sediment transport. At inlet and outlet areas, the greatest near-bed velocity fluctuation across the critical threshold for sediment transport coincided with the measurement times having frequent macro-turbulent flow. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2073-4441 |
| DOI: | 10.3390/w12071874 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eccaf0cf8e6021af64ee315a2d1c8d73 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....eccaf0cf8e6021af64ee315a2d1c8d73 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20734441 |
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| DOI: | 10.3390/w12071874 |