Radon activity and submarine groundwater discharge in different geological regions of a coastal barrier in Southern Brazil

Rocha, Cacinele Mariana da; Barboza, Eduardo Guimarães; Niencheski, Luís Felipe Hax

doi:10.1007/s12665-018-7711-0

Cited by 6 publications

(5 citation statements)

References 39 publications

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“…In the literature, each gram of suspended matter desorbsabout 2 dpm of 226 Ra in the mixing zone [40]. Based on this value and considering concentration of total Data collected by [23] added to those found by this study, show that distribution of 222 Rn follows a downward trend with the beach line spacing at an average rate of 0.5 dpm.L -1 .km -1 . In the west-central platform of Florida, [42] found activities from 7.2 dpm.L -1 , near the beach line, to 0.2 dpm.L -1 ,40 km offshore, which corresponds to a rate of approximately 0.17 dpm.L.km -1 .…”

Section: Spatial Distribution Of 222 Rnmentioning

confidence: 56%

“…In order to calculate advection rates (W), an endmember value had to be defined; it corresponds to 222 Rn activity in the groundwater that gives rise to the fluxes under investigation. In the northern region in RS, [23], through an extensive sampling network, found an endmember activity of 26.16 ± 1,37 dpm.L -1 . This value was used in this study for transects C and D. In order to find this value for the southernmost region, collections were taken from 9 wells off the coastal barrier at different depths (n = 20).…”

Section: Mariana Farias De Souzamentioning

confidence: 96%

“…The use of 222 Rn has already been considered promising in the quantification of groundwater flows to some lagoons in the RS coast [20][21][22]. As for the ocean, this elementhas successfully used to quantify SGD onbeaches in northern RS [23]. However no further radon evaluations have been made in regions separated from the beach.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Souza¹,

Andrade²,

Paiva³

et al. 2020

International Journal of Oceans and Oceanography

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222 Rn has been widely used as a tracer ofsubmarine groundwater discharge (SGD) processes because it offers certain advantages, such as being an inert gas that is found at high concentrations in groundwater. This studyshows, for the first time, the distribution of this element on the continental shelf adjacent to Rio Grande do Sul state, Brazil. It describes its relation with sources and oceanographic processes, as well as its contribution to the profile of SGD along the state coast that stretches over 400 km. Since it also aims to fill gaps in the understanding of the SGD process, it answers the following question: what are the constancy and the scope of the process along this coastal system? SGD quantificationwas made from 222 Rn mass balance. 222 Rn activity ranged from values below the detection limit to 1.23 ± 0.32 dpm.L -1 . Perpendicular to the coastline, 222 Rn activity decreased offshore at a rate of 0.5 dpm.L -1 .km -1 up to approximately 10 km from the coast, where it was constant and below 0.4 dpm.L -1 . Groundwater fluxes were 5.66 ± 1.30 (southern region), 2.06 ± 1.02 (central region), 5.50 ±1.50 (northern region) and 6.63 ± 1.03 cm.day -1 (northern region). Variability in advection rates found by this study shows that, incoastal systems which are dominated by a certain type of sediment, some factors, such as local hydrodynamics and geology, can alter SGD quantitatively.

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Section: Spatial Distribution Of 222 Rnmentioning

confidence: 56%

Section: Mariana Farias De Souzamentioning

confidence: 96%

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Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Souza¹,

Andrade²,

Paiva³

et al. 2020

International Journal of Oceans and Oceanography

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“…Os autores identificaram uma relação entre os aquíferos e as lagoas, com uma contribuição significativa da descarga da água subterrânea para as lagoas. Em continuidade a esses estudos, Rocha (2018) e Rocha et al (2018) avaliaram as conexões e as interações entre a água superficial e subterrânea no litoral norte do RS. Nesses estudos foi identificado que a DAS é influenciada por diferentes fatores, sendo um deles o comportamento geológico (padrões de empilhamento estratigráfico progradacional e retrogradacional) dos depósitos sedimentares que formam as barreiras costeiras.…”

Section: Introductionunclassified

fluxo da água subterrânea no sistema aquífero costeiro associado aos depósitos eólicos holocênicos na região do Cassino/RS

et al. 2023

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O comportamento do fluxo da água subterrânea em aquíferos costeiros pode ser influenciado localmente por fatores geológicos, geomorfológicos, topográficos, hidrogeológicos, climáticos e antrópicos. Esse trabalho tem como objetivo avaliar o sentido de fluxo da água subterrânea associado ao pacote de sedimentos eólicos e que fazem parte do Sistema Aquífero Costeiro (SAC) presente na região do Cassino/RS. Foram levantados e analisados dados já existentes de sondagens, poços de monitoramento e variações mensais dos níveis de águas. Também foram executados levantamentos de georadar que possibilitaram melhorar a avaliação da espessura e da geometria das camadas dos depósitos sedimentares que ocorrem em subsuperfície. Os resultados permitiram caracterizar as litologias encontradas, analisar o comportamento das variações dos níveis estáticos e da potenciometria, identificar a arquitetura deposicional dos estratos em subsuperfície e delimitar os depósitos sedimentares. A partir dos resultados foi identificado que a morfologia do terreno, as características texturais e geotécnicas dos depósitos sedimentares e o padrão de empilhamento estratigráfico das camadas são fatores que condicionam localmente os sentidos de fluxo do aquífero associado ao pacote eólico. Portanto, esse estudo contribuiu significativamente no aumento do conhecimento hidrogeológico da região e demostrou que o fluxo de água, mesmo em regiões próximas à linha de costa, pode ocorrer em diferentes sentidos.

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“…Submarine groundwater discharge (SGD), here defined as terrestrial groundwater discharging directly to the coastal ocean (following [1,2]), may occur along coastal interfaces of permeable sediments. Significant amounts of SGD have been reported, such as from Florida [3] and Southern Brazil [4] (see [5] for a review on other available studies).…”

Section: Introductionmentioning

confidence: 99%

Modeling the Potential of Submarine Groundwater Discharge to Facilitate Growth of Vibrio cholerae Bacteria

et al. 2019

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Submarine groundwater discharge (SGD), the discharge of terrestrial groundwater to the ocean, can govern the coastal benthic environment. Bacteria such as Vibrio cholerae inhabit coastal waters and sediments, whose growth can be influenced by SGD. In particular, salinity changes introduced by SGD could have a positive effect on the abundance but also virulence of non-halophilic V. cholera bacteria dwelling in coastal waters and shallow marine sediments. Here we assess potential effects of SGD on the environmental properties that favor V. cholerae in a numerical modeling study representing multiple scenarios. Approaching natural systems, simulation results reveal a high sensitivity of non-halophilic Vibrio cholerae growth to SGD and its primary driving factors. This dependency leads to highest growth potential at high groundwater inflow and low hydraulic conductivity of the aquifer as well as for steep sea-side boundary slopes. Besides its minor impact on the extent of SGD in our model, dispersion is a crucial limiting factor for V. cholerae habitat. We conclude that there is a close connection between the driving factors of SGD and low salinity zones along a coastal slope, and recommend taking these into consideration for evaluating local V. cholerae outbreaks.

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Radon activity and submarine groundwater discharge in different geological regions of a coastal barrier in Southern Brazil

Cited by 6 publications

References 39 publications

Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

fluxo da água subterrânea no sistema aquífero costeiro associado aos depósitos eólicos holocênicos na região do Cassino/RS

Modeling the Potential of Submarine Groundwater Discharge to Facilitate Growth of Vibrio cholerae Bacteria

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