Hydrogeology of the Atlantic continental margin

Kohout, F. A.; Meisler, Harold; Meyer, Frederick W.; Johnston, Richard H.; Leve, G. W.; Wait, Robert L.

doi:10.1130/dnag-gna-i2.463

Cited by 22 publications

(24 citation statements)

References 26 publications

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“…We found that Late Pleistocene recharge rates were at least 10 times greater than present day conditions. This phenomenon may also account for unusually freshwater observed at significant depths offshore New Jersey and New York [Hathaway et al, 1979;Kohout et al, 1988] as well as the high fluid pressures observed on the continental slope [Dugan and Flemings, 2000].…”

Section: Resultsmentioning

confidence: 99%

“…This suggests that the Tertiary and Cretaceous sand units once contained high salinity waters and were flushed with fresh groundwater, but diffusive transport of saltwater within the thick, low-permeability units has not yet reached equilibrium. Simple vertical diffusion models [Kohout et al, 1988]. Even based on the water table rates were high (~ 1 mm/yr) and confining units are thick [Dugan and Flemings, 2000].…”

Section: Introductionmentioning

confidence: 99%

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Integrating geophysical, hydrochemical, and hydrologic data to understand the freshwater resources on Nantucket Island, Massachusetts

Marksamer

Person

Day‐Lewis

et al. 2007

Subsurface Hydrology: Data Integration for Properties and Processes

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrating geophysical, hydrochemical, and hydrologic data to understand the freshwater resources on Nantucket Island, Massachusetts

Marksamer

Person

Day‐Lewis

et al. 2007

Subsurface Hydrology: Data Integration for Properties and Processes

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“…JOIDES test hole J-lB drilled 40 km offshore from Jacksonville, Florida, tapped an aquifer that produced a flow of fresh water to an height of 10 m above sea level [Kohout et al, 1988].…”

Section: Introductionmentioning

confidence: 99%

Chemical signals from submarine fluid advection onto the continental shelf

Moore¹,

Shaw²

1998

J. Geophys. Res.

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“…At the same time, deep-seated subsurface aquifer groundwater systems have developed under the seafloor, which are similar to those on land (Hathaway et al, 1979;Kohout et. al., 1988;Bisson, 1994;Moore, 1999).…”

Section: Introductionmentioning

confidence: 53%

Discovery and characterization of submarine groundwater discharge in the Siberian Arctic seas: a case study in the Buor-Khaya Gulf, Laptev Sea

et al. 2017

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Abstract. It has been suggested that increasing terrestrial water discharge to the Arctic Ocean may partly occur as submarine groundwater discharge (SGD), yet there are no direct observations of this phenomenon in the Arctic shelf seas. This study tests the hypothesis that SGD does exist in the Siberian Arctic Shelf seas, but its dynamics may be largely controlled by complicated geocryological conditions such as permafrost. The field-observational approach in the southeastern Laptev Sea used a combination of hydrological (temperature, salinity), geological (bottom sediment drilling, geoelectric surveys), and geochemical ( 224 Ra, 223 Ra, 228 Ra, and 226 Ra) techniques. Active SGD was documented in the vicinity of the Lena River delta with two different operational modes. In the first system, groundwater discharges through tectonogenic permafrost talik zones was registered in both winter and summer. The second SGD mechanism was cryogenic squeezing out of brine and watersoluble salts detected on the periphery of ice hummocks in the winter. The proposed mechanisms of groundwater transport and discharge in the Arctic land-shelf system is elaborated. Through salinity vs. 224 Ra and 224 Ra/ 223 Ra diagrams, the three main SGD-influenced water masses were identified and their end-member composition was constrained. Based on simple mass-balance box models, discharge rates at sites in the submarine permafrost talik zone were 1.7×10 6 m 3 d −1 or 19.9 m 3 s −1 , which is much higher than the April discharge of the Yana River. Further studies should apply these techniques on a broader scale with the objective of elucidating the relative importance of the SGD transport vector relative to surface freshwater discharge for both water balance and aquatic components such as dissolved organic carbon, carbon dioxide, methane, and nutrients.

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Hydrogeology of the Atlantic continental margin

Cited by 22 publications

References 26 publications

Integrating geophysical, hydrochemical, and hydrologic data to understand the freshwater resources on Nantucket Island, Massachusetts

Integrating geophysical, hydrochemical, and hydrologic data to understand the freshwater resources on Nantucket Island, Massachusetts

Chemical signals from submarine fluid advection onto the continental shelf

Discovery and characterization of submarine groundwater discharge in the Siberian Arctic seas: a case study in the Buor-Khaya Gulf, Laptev Sea

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