Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge

<p>Observations indicate that the fortnightly fluctuations in the mean amplitude of water level increase in the upstream direction along the lower half of a tide-dominated estuary (the Guadiana Estuary), with negligible river discharge, but remain constant upstream. Analytical solutions reprod...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	E. Garel, P. Zhang, H. Cai
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Geography. Anthropology. Recreation G Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/652630bfe0fb471ea07fdeb7435cd3ec
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:652630bfe0fb471ea07fdeb7435cd3ec
record_format	dspace
spelling	oai:doaj.org-article:652630bfe0fb471ea07fdeb7435cd3ec2021-11-08T13:55:25ZDynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge10.5194/os-17-1605-20211812-07841812-0792https://doaj.org/article/652630bfe0fb471ea07fdeb7435cd3ec2021-11-01T00:00:00Zhttps://os.copernicus.org/articles/17/1605/2021/os-17-1605-2021.pdfhttps://doaj.org/toc/1812-0784https://doaj.org/toc/1812-0792<p>Observations indicate that the fortnightly fluctuations in the mean amplitude of water level increase in the upstream direction along the lower half of a tide-dominated estuary (the Guadiana Estuary), with negligible river discharge, but remain constant upstream. Analytical solutions reproducing the semi-diurnal wave propagation shows that this pattern results from reflection effects at the estuary head. The phase difference between velocity and elevation increases from the mouth to the head (where the wave has a standing nature) as the timing of high and low water levels come progressively closer to slack water. Thus, the tidal (flood–ebb) asymmetry in discharge is reduced in the upstream direction. It becomes negligible along the upper estuary half as the mean sea level remains constant despite increased friction due to wave shoaling. Observations of a flat mean water level along a significant portion of an upper estuary suggest a standing wave character and, thus, indicate significant reflection of the propagating semi-diurnal wave at the head. Details of the analytical model show that changes in the mean depth or length of semi-arid estuaries, in particular for macrotidal locations, affect the fortnightly tide amplitude and, thus, the upstream mass transport and inundation regime. This has significant potential impacts on the estuarine environment in terms of ecosystem management.</p>E. GarelP. ZhangP. ZhangH. CaiH. CaiCopernicus PublicationsarticleGeography. Anthropology. RecreationGEnvironmental sciencesGE1-350ENOcean Science, Vol 17, Pp 1605-1621 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geography. Anthropology. Recreation G Environmental sciences GE1-350
spellingShingle	Geography. Anthropology. Recreation G Environmental sciences GE1-350 E. Garel P. Zhang P. Zhang H. Cai H. Cai Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
description	<p>Observations indicate that the fortnightly fluctuations in the mean amplitude of water level increase in the upstream direction along the lower half of a tide-dominated estuary (the Guadiana Estuary), with negligible river discharge, but remain constant upstream. Analytical solutions reproducing the semi-diurnal wave propagation shows that this pattern results from reflection effects at the estuary head. The phase difference between velocity and elevation increases from the mouth to the head (where the wave has a standing nature) as the timing of high and low water levels come progressively closer to slack water. Thus, the tidal (flood–ebb) asymmetry in discharge is reduced in the upstream direction. It becomes negligible along the upper estuary half as the mean sea level remains constant despite increased friction due to wave shoaling. Observations of a flat mean water level along a significant portion of an upper estuary suggest a standing wave character and, thus, indicate significant reflection of the propagating semi-diurnal wave at the head. Details of the analytical model show that changes in the mean depth or length of semi-arid estuaries, in particular for macrotidal locations, affect the fortnightly tide amplitude and, thus, the upstream mass transport and inundation regime. This has significant potential impacts on the estuarine environment in terms of ecosystem management.</p>
format	article
author	E. Garel P. Zhang P. Zhang H. Cai H. Cai
author_facet	E. Garel P. Zhang P. Zhang H. Cai H. Cai
author_sort	E. Garel
title	Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
title_short	Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
title_full	Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
title_fullStr	Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
title_full_unstemmed	Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
title_sort	dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/652630bfe0fb471ea07fdeb7435cd3ec
work_keys_str_mv	AT egarel dynamicsoffortnightlywaterlevelvariationsalongatidedominatedestuarywithnegligibleriverdischarge AT pzhang dynamicsoffortnightlywaterlevelvariationsalongatidedominatedestuarywithnegligibleriverdischarge AT pzhang dynamicsoffortnightlywaterlevelvariationsalongatidedominatedestuarywithnegligibleriverdischarge AT hcai dynamicsoffortnightlywaterlevelvariationsalongatidedominatedestuarywithnegligibleriverdischarge AT hcai dynamicsoffortnightlywaterlevelvariationsalongatidedominatedestuarywithnegligibleriverdischarge
_version_	1718442242548432896

Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge

Ejemplares similares