On the generation of internal waves by river plumes in subcritical initial conditions

Abstract Internal waves (IWs) in the ocean span across a wide range of time and spatial scales and are now acknowledged as important sources of turbulence and mixing, with the largest observations having 200 m in amplitude and vertical velocities close to 0.5 m s−1. Their origin is mostly tidal, but...

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Autores principales:	R. Mendes, J. C. B. da Silva, J. M. Magalhaes, B. St-Denis, D. Bourgault, J. Pinto, J. M. Dias
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/09fee6e6f46a4265acb51a7a60cf0161
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spelling	oai:doaj.org-article:09fee6e6f46a4265acb51a7a60cf01612021-12-02T13:57:05ZOn the generation of internal waves by river plumes in subcritical initial conditions10.1038/s41598-021-81464-52045-2322https://doaj.org/article/09fee6e6f46a4265acb51a7a60cf01612021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81464-5https://doaj.org/toc/2045-2322Abstract Internal waves (IWs) in the ocean span across a wide range of time and spatial scales and are now acknowledged as important sources of turbulence and mixing, with the largest observations having 200 m in amplitude and vertical velocities close to 0.5 m s−1. Their origin is mostly tidal, but an increasing number of non-tidal generation mechanisms have also been observed. For instance, river plumes provide horizontally propagating density fronts, which were observed to generate IWs when transitioning from supercritical to subcritical flow. In this study, satellite imagery and autonomous underwater measurements are combined with numerical modeling to investigate IW generation from an initial subcritical density front originating at the Douro River plume (western Iberian coast). These unprecedented results may have important implications in near-shore dynamics since that suggest that rivers of moderate flow may play an important role in IW generation between fresh riverine and coastal waters.R. MendesJ. C. B. da SilvaJ. M. MagalhaesB. St-DenisD. BourgaultJ. PintoJ. M. DiasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. Mendes J. C. B. da Silva J. M. Magalhaes B. St-Denis D. Bourgault J. Pinto J. M. Dias On the generation of internal waves by river plumes in subcritical initial conditions
description	Abstract Internal waves (IWs) in the ocean span across a wide range of time and spatial scales and are now acknowledged as important sources of turbulence and mixing, with the largest observations having 200 m in amplitude and vertical velocities close to 0.5 m s−1. Their origin is mostly tidal, but an increasing number of non-tidal generation mechanisms have also been observed. For instance, river plumes provide horizontally propagating density fronts, which were observed to generate IWs when transitioning from supercritical to subcritical flow. In this study, satellite imagery and autonomous underwater measurements are combined with numerical modeling to investigate IW generation from an initial subcritical density front originating at the Douro River plume (western Iberian coast). These unprecedented results may have important implications in near-shore dynamics since that suggest that rivers of moderate flow may play an important role in IW generation between fresh riverine and coastal waters.
format	article
author	R. Mendes J. C. B. da Silva J. M. Magalhaes B. St-Denis D. Bourgault J. Pinto J. M. Dias
author_facet	R. Mendes J. C. B. da Silva J. M. Magalhaes B. St-Denis D. Bourgault J. Pinto J. M. Dias
author_sort	R. Mendes
title	On the generation of internal waves by river plumes in subcritical initial conditions
title_short	On the generation of internal waves by river plumes in subcritical initial conditions
title_full	On the generation of internal waves by river plumes in subcritical initial conditions
title_fullStr	On the generation of internal waves by river plumes in subcritical initial conditions
title_full_unstemmed	On the generation of internal waves by river plumes in subcritical initial conditions
title_sort	on the generation of internal waves by river plumes in subcritical initial conditions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/09fee6e6f46a4265acb51a7a60cf0161
work_keys_str_mv	AT rmendes onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions AT jcbdasilva onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions AT jmmagalhaes onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions AT bstdenis onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions AT dbourgault onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions AT jpinto onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions AT jmdias onthegenerationofinternalwavesbyriverplumesinsubcriticalinitialconditions
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On the generation of internal waves by river plumes in subcritical initial conditions

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