Hydrogeological characterization of southeast coastal plain aquifers and groundwater discharge to Onslow Bay, North Carolina (USA)

McCoy, C. A.; Corbett, D. Reide; Cable, Jaye E.; Spruill, Richard K.

doi:10.1016/j.jhydrol.2007.03.008

Cited by 27 publications

(19 citation statements)

References 44 publications

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“…Groundwater advection rates to surface waters are often difficult to quantify but can be assessed indirectly via geochemical tracers such as radium isotopes and radon (Moore, 1996(Moore, , 2000Charette et al, 2001;Krest and Harvey, 2003;Burnett et al, 1996;Cable et al, 1996;Burnett and Dulaiova, 2003;McCoy et al, 2007;Martin et al, 2007). Radon has greater utility as an SGD tracer where the discharge is fresh or a mixture of fresh and recirculated seawater since any groundwater in the aquifer (independent of its salinity) that is in contact with sediments and rocks is enriched in radon.…”

Section: Introduction and Study Sitementioning

confidence: 99%

Geochemical and physical sources of radon variation in a subterranean estuary — Implications for groundwater radon activities in submarine groundwater discharge studies

et al. 2008

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Submarine groundwater discharge (SGD), in form of springs and diffuse seepage, has long been recognized as a source of chemical constituents to the coastal ocean.Because groundwater is two to four orders of magnitude richer in radon than surface water, it has been used as both a qualitative and a quantitative tracer of groundwater discharge. Besides this large activity gradient, the other perceived advantage of radon stems from its classification as noble gas; that is, its chemical behavior is expected not to be influenced by salinity, redox, and diagenetic conditions present in aquatic environments.During our three-year monthly sampling of the subterranean estuary (STE) in Waquoit Bay, MA, we found highly variable radon activities (50-1600 dpm L -1 ) across the fresh-saline interface of the aquifer. We monitored pore water chemistry and radon activity at 8 fixed depths spanning from 2 to 5.6 m across the STE, and found seasonal fluctuations in activity at depths where elevated radon was observed. We postulate that most of pore water 222 Rn is produced from particle-surface bound 226 Ra, and that the accumulation of this radium is likely regulated by the presence of manganese (hydr)oxides. Layers of manganese (hydr)oxides form at the salinity transition zone (STZ), where water with high salinity, high manganese, and low redox potential mixes with fresh water. Responding to the seasonality of aquifer recharge, the location of the STZ and the layers with radium enriched manganese (hydr)oxide follows the seasonal land-or bay-ward movement of the freshwater lens. This results in seasonal changes in the depth where elevated radon activities are observed. 3The conclusion of our study is that the freshwater part of the STE has a radon signature that is completely different from the STZ or recirculated sea water. Therefore, the radon activity in SGD will depend on the ratio of fresh and recirculated seawater in the discharging groundwater.

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Section: Introduction and Study Sitementioning

confidence: 99%

Geochemical and physical sources of radon variation in a subterranean estuary — Implications for groundwater radon activities in submarine groundwater discharge studies

et al. 2008

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“…Other investigators have applied radon to calculate groundwater discharge rates in the coastal ocean , karstic lakes (Kraemer, 2005;Tuccimei et al, 2005), estuaries (Schwartz, 2003), streams (Cook et al, 2003), and even on the continental shelf (McCoy et al, 2007). A series of intercomparison experiments demonstrated that 222 Rn-derived advection rates are comparable to other methods, such as seepage meters Mulligan and Charette, 2006) and conventional hydrological methods (Tuccimei et al, 2005), demonstrating that radon can be an effective groundwater tracer.…”

Section: Selecting the Most Appropriate Groundwater Tracermentioning

confidence: 99%

“…While tracer-derived advection rates have been extrapolated to the whole area of small lakes (Corbett et al, 1997;Schmidt and Schubert, 2007;Tuccimei et al, 2005) and some continental shelf environments (McCoy et al, 2007;Windom et al, 2006) in order to calculate the total water input, this approach is not appropriate for Mangueira Lagoon because of its large size and concentrated discharge in the irrigation canals. In a preliminary attempt to determine the width of the seepage face in Mangueira Lagoon, we deployed four Lee-type seepage meters (Cable et al, 2006) along an offshore transect extending 225 m from Oliveira Beach.…”

Section: Regional Significance Of Groundwater Dischargementioning

confidence: 99%

Tracing anthropogenically driven groundwater discharge into a coastal lagoon from southern Brazil

Santos

Niencheski

Burnett

et al. 2008

Journal of Hydrology

108

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“…Recently, Lewis et al (2008) revealed the hydrogeological system of five distinctive hydrogeological systems as fundamental before going to assess groundwater resources in the Broken Hill Region, Australia. Many other works demonstrating the necessities of portraying the aquifer system as groundwater resources had been investigated in the Lower Mississippi Valley, USA (Boswell, 1996); Kali-Ganga sub-basin, India (Umar et al, 2001); Central Kalimantan, Indonesia (Ludang et al, 2007); southeast coastal plain aquifers, North Carolina, USA (McCoy et al, 2007); the Bengal basin in India and Bangladesh (Mukherjee et al, 2009); an altered wetland in Jordan (Litaor et al, 2008); and, many others. The subjects of aquifer system identification and characterization have been done for many other areas by many researchers over the world but have not been done yet for the entire city of Hanoi.…”

Section: Introductionmentioning

confidence: 99%

Aquifer system for potential groundwater resources in Hanoi, Vietnam

Bui

Kawamura

Tong

et al. 2012

Hydrological Processes

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Abstract:Predictions in Ungauged Basins (PUB) mainly focus on surface water, but there are much higher prediction uncertainties inherent in groundwater. Hanoi depends entirely on groundwater for its domestic water supply. However, the characteristics of the entire Hanoi aquifer system remain poorly understood due to the lack of available data. Recently, we were nominated to construct a hydrogeological database. Using the valuable data contained in this database, this paper comprehensively analyzed the best number of 240 boreholes including well logs and their hydrogeological parameters obtained from pumping tests for the first time in order to identify the entire Hanoi aquifer system and characterize the hydrogeological conditions for potential groundwater resources. Great efforts have been made to establish and analyze the hydrogeological maps, cross sections and the isopach maps of main aquifers' thickness and transmissibility. As for the results, we found that groundwater mainly exists in the topmost Holocene unconfined aquifer and the shallow Pleistocene confined aquifer (PCA), while cleft and karst water exists in the Neogene water bearing layer and the Mesozoic fractured zones. These aquifers are adequately, quantitatively characterized and evaluated from the viewpoint of potential groundwater resources. We found the PCA serving as the highest groundwater potential and the most important aquifer for the water supply. The findings are indispensable for further groundwater analyses contributing to ensuring the sustainable groundwater development not only in Hanoi but also in poorly gauged or ungauged neighboring basins.

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Hydrogeological characterization of southeast coastal plain aquifers and groundwater discharge to Onslow Bay, North Carolina (USA)

Cited by 27 publications

References 44 publications

Geochemical and physical sources of radon variation in a subterranean estuary — Implications for groundwater radon activities in submarine groundwater discharge studies

Geochemical and physical sources of radon variation in a subterranean estuary — Implications for groundwater radon activities in submarine groundwater discharge studies

Tracing anthropogenically driven groundwater discharge into a coastal lagoon from southern Brazil

Aquifer system for potential groundwater resources in Hanoi, Vietnam

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