Analysis of stratification patterns in river-influenced mesotidal and macrotidal estuaries using 3D hydrodynamic modelling and K-means clustering

Bárcena, Javier F.; García-Alba, Javier; Garcı́a, Andrés; Álvarez, César

doi:10.1016/j.ecss.2016.08.005

Cited by 23 publications

(10 citation statements)

References 47 publications

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“…This input not only significantly influences the salinity of waterbodies but also affects the stratification and circulation of coastal waters [20]. Bárcena, et al [21] in their study describe that huge freshwater inputs during rainfall are the main force of estuarine circulation and that at the same time the estuary is constantly being mixed. After heavy rainfall on 29 th July, high freshwater inputs stratified salinity around Atsumi Bay.…”

Section: Freshwater Influence On Salinity Alteration Pre and Post Raimentioning

confidence: 99%

Effect of Nutrient Inputs on Water Quality Change and Phytoplankton Growth in Atsumi Bay

Mahlil

Inoue

Matsumoto

et al. 2018

J. Eng. Technol. Sci.

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Eutrophication in an estuary occurs as an effect of the enrichment of nutrient inputs from rivers. This condition has become one of the most common environmental issues experienced around the globe and especially in Japan. Atsumi Bay is a eutrophic coastal area in Japan. The objective of this research was to analyze the influences of nutrient inputs from the Umeda River into Atsumi Bay on pre-and post-rainfall water quality conditions. This study was conducted from July to October 2010. The results showed a decrease of surface salinity after rainfall indicating that huge freshwater inputs had overlaid the surface layer of Atsumi Bay rather than the bottom layer. Moreover, post-rainfall conditions showed an increase of chlorophyll a as an effect of phytoplankton growth, followed by an increase of particulate nutrients. On the other hand, dissolved nutrients decreased due to uptake by phytoplankton and dilution by freshwater.

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Section: Freshwater Influence On Salinity Alteration Pre and Post Raimentioning

confidence: 99%

Effect of Nutrient Inputs on Water Quality Change and Phytoplankton Growth in Atsumi Bay

Mahlil

Inoue

Matsumoto

et al. 2018

J. Eng. Technol. Sci.

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“…Delft3D is a widely applied state-of-the-art model used to evaluate different processes in complex estuarine systems. The Delft3D-FLOW module has been applied to several studies that have confirmed its ability to simulate hydrodynamics within estuaries (for example, Abascal et al, 2017;Bárcena et al, 2016;Iglesias and Carballo, 2010;García Alba et al, 2014;Jiménez et al, 2014;Núñez et al, 2019;Zhou et al, 2014). This and the possibilities offered by the Lagrangian module Delft3D-PAR to evaluate the transport of plastics (van Utenhove, 2019) have informed the selection of this model for this study.…”

Section: Methodsmentioning

confidence: 95%

“…C was characterised as a variable with depth according to the equivalent geometrical roughness of Nikuradse (k s ), and varied with cell size according to a calibration constant (k). Considering that both the geometries and the representative dimensions of the study estuaries were within the ranges evaluated by Speer and Aubrey (1985) and Bárcena et al (2016), these parameters were consistently defined for all study estuaries by adopting a value of 0.2, for k s and 0.1, for k.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

Role of ocean tidal asymmetry and estuarine geometry in the fate of plastic debris from ocean sources within tidal estuaries

Núñez¹,

Castanedo²,

Medina³

2021

Estuarine, Coastal and Shelf Science

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“…Estuarine hydrodynamics, RT, and ET vary in both space and time (Zhang et al, 2010;Azhikodan and Yokoyama, 2016;Bárcena et al, 2016). The combined effects of several meteoceanographic drivers (tides, riverine flows and meteorological data, such as wind) and estuarine geomorphology shape the hydrodynamics, RT and ET on timescales ranging from hours to months (Bárcena et al, 2012;Defne and Ganju, 2015;Xiong et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The Influence of the River Discharge on Residence Time, Exposure Time and Integrated Water Fractions for the Tagus Estuary (Portugal)

et al. 2022

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Understanding how long water is retained in an estuary and how quickly it is completely flushed is essential to estimate an estuary’s health in areas with significant pollutant loadings. The present study analyses the effect of five different Tagus River discharge scenarios ranging from low to extreme on residence time (RT), exposure time (ET) and integrated water fractions inside pre-established Tagus estuary areas, to identify its most vulnerable areas to pollution. The 3D version of the MOHID hydrodynamic model coupled to a lagrangian tool was used. The increase of the river discharge generated high current velocities which, in turn, led to an increased rate of tracers leaving the estuary. As a consequence, RT and ET decreased from 59 to 3.5 days under a low and extreme river discharge scenario, respectively. Under a low river discharge, significant differences were observed between RT and ET in the areas located in the main body of the estuary and in the bays. As river discharge increased, RT and ET decreased in all areas of the estuary and those differences faded, with the greatest differences observed in the areas situated along the south margin. In general, results showed that with high river discharges the tracers released in the upper estuary are spread throughout the estuary, but mainly in downstream areas. However, when the river discharge reached exceptionally high values, local eddies were formed, leading to the retention of the tracers in the estuary’s south margin and inner bays. The results in this study allowed to identify the most vulnerable areas within the estuary as a function of the river discharge.

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Analysis of stratification patterns in river-influenced mesotidal and macrotidal estuaries using 3D hydrodynamic modelling and K-means clustering

Cited by 23 publications

References 47 publications

Effect of Nutrient Inputs on Water Quality Change and Phytoplankton Growth in Atsumi Bay

Effect of Nutrient Inputs on Water Quality Change and Phytoplankton Growth in Atsumi Bay

Role of ocean tidal asymmetry and estuarine geometry in the fate of plastic debris from ocean sources within tidal estuaries

The Influence of the River Discharge on Residence Time, Exposure Time and Integrated Water Fractions for the Tagus Estuary (Portugal)

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