Export of dissolved and suspended matter from the main estuaries in South Portugal during winter conditions

Correia, Carla; Torres, Ana F.; Rosa, Alexandra; Cravo, Alexandra; Jacob, José; Júnior, Luciano; Garel, Erwan

doi:10.1016/j.marchem.2020.103827

Cited by 4 publications

(5 citation statements)

References 68 publications

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“…Moreover, the negative anomalies of Dinophysis associated with high river discharges probably reflected increased advective losses (e.g., Moita et al, 2016), as also referred for Pseudo-nitzschia. Yet, modest positive anomalies associated with low to medium river discharges could point to their beneficial effects on Dinophysis, associated with increases in nutrient availability (Cravo et al, 2006;Caballero et al, 2014;Correia et al, 2020), mainly during downwelling periods (see Hickey et al, 2005), decreased turbulence and increased I m , due to haline stratification (e.g., Peperzak et al, 1996;Díaz et al, 2013Díaz et al, , 2021Moita et al, 2016).…”

Section: Variability Patterns and Predictors Of Dsp-producersmentioning

confidence: 99%

Variability patterns and phenology of harmful phytoplankton blooms off southern Portugal: Looking for region-specific environmental drivers and predictors

2022

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Section: Variability Patterns and Predictors Of Dsp-producersmentioning

confidence: 99%

Variability patterns and phenology of harmful phytoplankton blooms off southern Portugal: Looking for region-specific environmental drivers and predictors

2022

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“…The freshwater discharge into the estuary is generally low, in particular in summer when it is typically <10 m 3 s −1 (see Garel and D'Alimonte, 2017). During a single tide, this rate corresponds to a volume of freshwater input approximately 70 times lower than the average tidal prism (30 Mm −3 ; Correia et al, 2020). Under these conditions, the water column is generally well mixed (Garel et al, 2009).…”

Section: Study Site Overviewmentioning

confidence: 99%

“…This case concerns many worldwide estuaries, typically in semi-arid regions, where the river flow influence is not relevant compared to the tidal forcing -during a large part of the year, at least (e.g. Correia et al, 2020;Descroix et al, 2020;Dias et al, 2016;Frota et al, 2013;Garel and D'Alimonte, 2017;Lamontagne et al, 2016;Lopez et al, 2020;McCutcheon et al, 2019;Valle-Levinson and Schettini, 2016). Due to high freshwater demands for irrigation and other uses, semiarid estuaries are under increasing stress worldwide from decreased freshwater inflows (Feng and Fu, 2013;Leblanc et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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

2021

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Abstract. 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.

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“…The freshwater discharge into the estuary is generally low, in particular in summer when it is typically < 10 m 3 /s (see Garel and D'Alimonte, 2017). During a single tide, this rate corresponds to a volume of freshwater input approximately 70 times lower than the average tidal prism (30 Mm 3 ; Correia et al, 2020). Under these conditions, the water column is generally wellmixed (Garel et al, 2009).…”

Section: Study Site Overviewmentioning

confidence: 99%

“…Without significant river discharge, fluctuations of the subtidal friction generated by tidal contributions alone may also produce a fortnightly tide (Vignoli et al, 2003). This case concerns many worldwide estuaries, typically in semi-arid regions, where the river flow influence is non-relevant compared to the tidal forcing during a large part of the year, at least (e.g., Correia et al, 2020;Descroix et al, 2020;Dias et al, 2016;Frota et al, 2013;Garel and D'Alimonte, 2017;Lamontagne et al, 2016;Lopez et al, 2020;McCutcheon et al, 2019;Valle-Levinson and Schettini, 2016). Due to high freshwater demands for irrigation and other uses, semi-arid estuaries are under increasing stress worldwide from decreased freshwater inflows (Feng and Fu, 2013;Leblanc et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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

Garel

Zhang

Cai

2021

Preprint

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Abstract. Observations indicate that the fortnightly fluctuations in mean water level increase in amplitude 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 high and low water levels get 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, easier to obtain than the phase difference, can therefore indicate significant reflection of the propagating semi-diurnal wave at the head. Details of the analytical model shows 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.

show abstract

Export of dissolved and suspended matter from the main estuaries in South Portugal during winter conditions

Cited by 4 publications

References 68 publications

Variability patterns and phenology of harmful phytoplankton blooms off southern Portugal: Looking for region-specific environmental drivers and predictors

Variability patterns and phenology of harmful phytoplankton blooms off southern Portugal: Looking for region-specific environmental drivers and predictors

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

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

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