Applications of radon and radium isotopes to determine submarine groundwater discharge and flushing times in Todos os Santos Bay, Brazil

Hatje, Vanessa; Attisano, Karina Kammer; Souza, Marcelo Friederichs Landim de; Mazzilli, B. P.; Oliveira, Joselene de; Mora, Tamires de Araujo; Burnett, William C.

doi:10.1016/j.jenvrad.2017.08.004

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…Several studies have evaluated water renewal rates by experimental methods (e.g. isotope tracers: Hatje et al 2017). Our approach used numerical 3D hydrodynamic models to calculate the HTs and relate them to particle transport and sediment dynamics in the Southern Lagoon of New Caledonia.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic time parameters response to meteorological and physical forcings: toward a stagnation risk assessment device in coastal areas

et al. 2019

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Identifying zones of stagnation and deposition of terrigenous matter or contaminants induced by human activity is a key issue in coastal areas. In this paper, circulation processes and potential contaminant stagnation and deposition zones were assessed using hydrodynamic time parameters forced with meteorology. The study focused on an Eulerian time parameter, the local e-flushing time (eFT). The hydrodynamic modeling of coastal zones was applied to two bays of New Caledonia, located downstream of open mining sites. Numerous simulations were performed to classify the influence of forcing conditions on the eFTs variability. The need to consider meteorological forcings rather than average weather conditions for the calculation of eFTs was demonstrated. In coastal zones, high wind velocity was the major forcing influencing eFTs, but below a threshold wind velocity, tidal range and river inputs became significant parameters. Spatial variations of eFTs values, depending on meteorological conditions, induced varying risks of stagnation zones. General responses of the bays' hydrodynamics and the exposure of zones to potential contaminants were defined under various forcings. Our findings demonstrate that strong turbulence zones are not always characterized by short eFTs because of antagonistic forcing effects. Diurnal tidal alternations were also proven to have less influence on eFT variations than tidal range changes over a lunar cycle.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic time parameters response to meteorological and physical forcings: toward a stagnation risk assessment device in coastal areas

et al. 2019

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“…Em relação ao Brasil, duas revisões bibliográficas sobre a aplicação da radioatividade em estudos ambientais, incluindo a hidrologia, foram encontradas na literatura, SANTOS et al Nota-se, na realidade, que as aplicações desses radionuclídeos naturais em estudos hidrogeológicos são muito escassas no Brasil, restritas a alguns grupos com histórico de publicações envolvendo a questão da radioatividade ambiental. Além disso, destacam-se os estudos de SGD na Baía de Todos os Santos, em cooperação com grupos nacionais e internacionais (HATJE et al 2017).…”

Section: Aplicações Na Hidrologiaunclassified

Aplicação de isótopos de rádio e radônio em estudos do aporte de águas subterrâneas para rios e região costeira

Godoy¹

2021

Derb.

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O presente trabalho teve como objetivo servir como um guia orientador àqueles que desejam utilizar os isótopos de rádio (228Ra, 226Ra, 224Ra, 223Ra) e o 222Rn, como traçadores naturais, em estudos envolvendo a descarga de água subterrânea para a região costeira (Submarine Groundwater Discharge, SGD) e, também, para rios e lagoas. Nota- se, uma carência de estudos hidrogeológicos desenvolvidos no Brasil empregando- se tais traçadores. Como potenciais razões para tal estão a necessidade de conhecimento e de equipamentos especializados. Dessa forma, o leitor irá encontrar nesse trabalho uma breve descrição dos métodos de medição empregados e os fundamentos básicos que norteiam essas aplicações.

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“…Distribution of 222 Rn was studied in few places in Brazil. In astudy carried out in Todosos Santos Bay (northeastern Brazil) [46],most radon measurements ranged between 1 and 2 dpm.L -1 andsalinity varied from 29 to 35. The authors interpret that, at this location, there could be high atmospheric losses due to high speedwinds (between 5 and 8 ms -1 ).…”

Section: Spatial Distribution Of 222 Rnmentioning

confidence: 99%

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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Applications of radon and radium isotopes to determine submarine groundwater discharge and flushing times in Todos os Santos Bay, Brazil

Cited by 11 publications

References 42 publications

Hydrodynamic time parameters response to meteorological and physical forcings: toward a stagnation risk assessment device in coastal areas

Hydrodynamic time parameters response to meteorological and physical forcings: toward a stagnation risk assessment device in coastal areas

Aplicação de isótopos de rádio e radônio em estudos do aporte de águas subterrâneas para rios e região costeira

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

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