Review of submarine groundwater discharge (SGD) in coastal zones of the Southeast and Gulf Coast regions of the United States with management implications

McCoy, C. A.; Corbett, D. Reide

doi:10.1016/j.jenvman.2008.03.002

Cited by 59 publications

(34 citation statements)

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“…Chemical constituents in submarine groundwater discharge (SGD) are now widely recognized to have a significant impact on coastal ecosystems (Knee and Jordan, 2013;McCoy and Corbett, 2009;Null et al, 2012;Slomp and Van Cappellen, 2004). SGD is conventionally defined as "any flow of water out across the seafloor without regards to its composition and its origin" (Burnett et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen transformations along a shallow subterranean estuary

et al. 2017

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Abstract. The transformations of chemical constituents in subterranean estuaries (STEs) control the delivery of nutrient loads from coastal aquifers to the ocean. It is important to determine the processes and sources that alter nutrient concentrations at a local scale in order to estimate accurate regional and global nutrient fluxes via submarine groundwater discharge (SGD), particularly in boreal environments, where data are still very scarce. Here, the biogeochemical transformations of nitrogen (N) species were examined within the STE of a boreal microtidal sandy beach located in the Magdalen Islands (Quebec, Canada). This study revealed the vertical and horizontal distribution of nitrate (NO, dissolved organic nitrogen (DON) and total dissolved nitrogen (TDN) measured in beach groundwater during four spring seasons (June 2011(June , 2012(June , 2013(June and 2015 when aquifer recharge was maximal after snowmelt. Inland groundwater supplied high concentrations of NO x and DON to the STE, whereas inputs from seawater infiltration were very limited. Non-conservative behaviour was observed along the groundwater flow path, leading to low NO x and high NH + 4 concentrations in the discharge zone. The long transit time of groundwater within the beach (∼ 166 days), coupled with oxygen-depleted conditions and high carbon concentrations, created a favourable environment for N transformations such as heterotrophic and autotrophic denitrification and ammonium production. Biogeochemical pathways led to a shift in nitrogen species along the flow path from NO x -rich to NO x -poor groundwater. An estimate of SGD fluxes of N was determined to account for biogeochemical transformations within the STE based on a N-species inventory and Darcy's flow. Fresh inland groundwater delivered 37 mol NO x yr −1 per metre of shoreline and 63 mol DON m −1 yr −1 to the STE, and NH and DON. Our study shows the importance of tidal sands in the biogeochemical transformation of the terrestrial N pool. This local export of bioavailable N probably supports benthic production and higher trophic levels leading to its rapid transformation in surface sediments and coastal waters.

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Section: Introductionmentioning

confidence: 99%

Nitrogen transformations along a shallow subterranean estuary

et al. 2017

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“…Airborne thermal infrared images and continuous monitoring of electric conductivity [EC], salinity, temperature and 222 Rn activity in the course of oceanographic research campaigns have proved especially useful in relation to coastal karstic aquifers (Burnett et al, 2001;McCoy and Corbett, 2009). …”

Section: Introductionmentioning

confidence: 99%

Methodological study of submarine groundwater discharge from a karstic aquifer in the Western Mediterranean Sea

Mejı́as

Ballesteros

Antón-Pacheco

et al. 2012

Journal of Hydrology

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“…3,5 Over the past two decades, many reviews and nationalscale studies on SGD have also emerged for many specific areas, such as the Baltic Sea, 6 tropical islands 1 and part of North America. 2,7 However, no overview has been undertaken for the studies carried out in South America, a region of the world where many different hydrogeological provinces can be found (e.g., Amazon Sedimentary Basin, Orinoco lowlands, Paraná Sedimentary Basin), 8 and where significant advances on SGD investigation have occurred in the past two decades. This led us to ask: how much do we know about SGD in South America?…”

Section: Introductionmentioning

confidence: 99%

Advances of Submarine Groundwater Discharge Studies in South America

Paiva¹,

Niencheski²

2017

J. Braz. Chem. Soc.

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Submarine groundwater discharge (SGD) is the hidden portion of water that discharges into the ocean across the ocean-land interface, and it is considered one of the hydrological cycle's major components. Two decades ago, SGD in South America was undocumented, and significant advances on this field has occurred since then. This paper presents the results of SGD investigations, a compilation of the SGD estimations, and the areas lacking of data in South America. The compilation of observed SGD in South America shows that groundwater seepage from the land to the ocean occurs in many environments along the coast. Considering only the few regions for which the total SGD flux was estimated, the SGD flux (ca. 1.2 × 10 8 m 3 day -1 ) is equivalent in volume to almost 70% of Amazon River discharge. Although the study of SGD in South America has greatly advanced, many uninvestigated sites and key questions remain.

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Review of submarine groundwater discharge (SGD) in coastal zones of the Southeast and Gulf Coast regions of the United States with management implications

Cited by 59 publications

References 60 publications

Nitrogen transformations along a shallow subterranean estuary

Nitrogen transformations along a shallow subterranean estuary

Methodological study of submarine groundwater discharge from a karstic aquifer in the Western Mediterranean Sea

Advances of Submarine Groundwater Discharge Studies in South America

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