Ra and Rn isotopes as natural tracers of submarine groundwater discharge in the patagonian coastal zone (Argentina): an initial assessment

Torres, Américo Iadran; Andrade, Carlos F.; Moore, Willard S.; Faleschini, Mauricio; Esteves, José Luís; Niencheski, Luís Felipe Hax; Depetris, Pedro J.

doi:10.1007/s12665-018-7308-7

Cited by 11 publications

(3 citation statements)

References 48 publications

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“…Over the last decade, numerous studies worldwide have successfully applied radon and radium isotopes to quantify SGD fluxes over a range of different time-scales, estimate the magnitude of SGD and determine its relative importance in chemical budgets of coastal waters [12][13][14][15]. However, the behavior of radium and radon in coastal aquifers is complex [16], and also laboratory experiments of radioisotopes are impossible in developing countries.…”

Section: Introductionmentioning

confidence: 99%

Scrutinizing Relationships between Submarine Groundwater Discharge and Upstream Areas Using Thermal Remote Sensing: A Case Study in the Northern Persian Gulf

et al. 2021

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Nutrient input through submarine groundwater discharge (SGD) often plays a significant role in primary productivity and nutrient cycling in the coastal areas. Understanding relationships between SGD and topo-hydrological and geo-environmental characteristics of upstream zones is essential for sustainable development in these areas. However, these important relationships have not yet been completely explored using data-mining approaches, especially in arid and semi-arid coastal lands. Here, Landsat 8 thermal sensor data were used to identify potential sites of SGD at a regional scale. Relationships between the remotely-sensed sea surface temperature (SST) patterns and geo-environmental variables of upland watersheds were analyzed using logistic regression model for the first time. The accuracy of the predictions was evaluated using the area under the receiver operating characteristic curve (AUC-ROC) metric. A highly accurate model, with the AUC-ROC of 96.6%, was generated. Moreover, the results indicated that the percentage of karstic lithological formation and topographic wetness index were key variables influencing SGD phenomenon and spatial distribution in the northern coastal areas of the Persian Gulf. The adopted methodology and applied metrics can be transferred to other coastal regions as a rapid assessment procedure for SGD site detection. Moreover, the results can help planners and decision-makers to develop efficient environmental management strategies and the design of comprehensive sustainable development policies.

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Section: Introductionmentioning

confidence: 99%

Scrutinizing Relationships between Submarine Groundwater Discharge and Upstream Areas Using Thermal Remote Sensing: A Case Study in the Northern Persian Gulf

et al. 2021

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“…A nivel internacional se pueden citar numerosos estudios sobre la detección de la SGD por varios métodos, pero no así en Argentina. Además del realizado por Carretero et al (2019) para el PDLC, existe otra investigación en la Patagonia argentina (Torres et al, 2018), donde se ha detectado en las costas de Chubut y Santa Cruz la presencia de 222 Rn. La mera presencia de este elemento indica la salida de agua dulce al mar, con lo cual, si bien los autores no han cuantificado un valor de flujo, sí se ha comprobado la existencia del fenómeno.…”

Section: Discussionunclassified

Análisis de la descarga submarina en dos sectores de la costa oriental de la Provincia de Buenos Aires, Argentina

Carretero,

Rapaglia,

Rodrigues Capítulo

et al. 2023

AGL

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La descarga de agua dulce subterránea en el mar (SGD: sigla en inglés) es un proceso natural que ocurre en la interfase continente-océano y es de importancia en la dinámica costera. En la costa oriental de la provincia de Buenos Aires, Argentina (Partidos de La Costa y Pinamar) se planteó como objetivo detectar la descarga de agua dulce desde el acuífero arenoso hacia el Océano Atlántico aplicando balance de masas de 222Rn como trazador y mapas de flujo subterráneo. Se midió la actividad del 222Rn en el agua subterránea en perforaciones y en transectas a 300 m de la línea de costa. En base a la obtención de la profundidad en los pozos de la red de monitoreo existente se construyeron mapas isofreáticos. La SGD para La Costa resultó en 0,37 m3/m/d según la hidrodinámica y 3,5 m3/m/d según el radón. Para Pinamar estos valores fueron de 0,66 y 0,55 m3/m/d respectivamente. La presencia de sedimentos en suspensión del Río de la Plata tendría influencia sobre las mediciones de radón incrementando los valores de descarga en La Costa, mientras que en Pinamar la ausencia de los mismos permitió la obtención de resultados similares por ambas metodologías.

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“…It explains the low activity that was found when both studieswere compared. In the south of South America, on the coast of Argentina, [49] found high values, between 1 and 6 dpm.L -1 , which the authors suggest to be associated with intense SGD.…”

Section: Spatial Distribution Of 222 Rnmentioning

confidence: 90%

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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Ra and Rn isotopes as natural tracers of submarine groundwater discharge in the patagonian coastal zone (Argentina): an initial assessment

Cited by 11 publications

References 48 publications

Scrutinizing Relationships between Submarine Groundwater Discharge and Upstream Areas Using Thermal Remote Sensing: A Case Study in the Northern Persian Gulf

Scrutinizing Relationships between Submarine Groundwater Discharge and Upstream Areas Using Thermal Remote Sensing: A Case Study in the Northern Persian Gulf

Análisis de la descarga submarina en dos sectores de la costa oriental de la Provincia de Buenos Aires, Argentina

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

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