Thermal evidence of water exchange through a coastal aquifer: Implications for nutrient fluxes

Moore, Willard S.

doi:10.1029/2001gl014923

Cited by 19 publications

(29 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Moore et al [2002] and Moore and Shaw [1998] suggested that deeper semiconfined aquifer systems may play a significant role in groundwater discharge to the ocean. Moore et al [2002] concluded from tidal variations in groundwater temperature of a semiconfined coastal aquifer that tidal pumping is the responsible mechanism explaining their observations. Accordingly, our results promote further confirmation of this finding.…”

Section: Resultsmentioning

confidence: 99%

Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer

et al. 2010

View full text Add to dashboard Cite

[1] We applied a hydrogeological numerical simulation to investigate spatial and temporal variations in groundwater flow and discharge at a well-studied tidal flat margin in the German Wadden Sea. The simulation was forced by high-resolution sea level boundary conditions. Accuracy of the simulation was checked by comparing simulated with measured pressure heads obtained from direct burial pressure sensor measurements. Overall discharge calculated from the simulation for a time period of almost 12 month averages 0.97 m 3 per meter of margin length per tide but may vary significantly, most pronounced with the spring-neap tide cycle. The simulation predicts that the maximum hydraulic gradient at ebb tide controls the magnitude of discharge, whereas duration of ebb tide is less important. Additionally, simulated and measured pressure gradients can be used to investigate the influence of varying lithology on the groundwater flow regime. The presence of a low permeable Holocene silt layer, ubiquitous in the study area, creates a layered unconfined/semiconfined aquifer system. Both parts of the aquifer are hydraulically connected to the deeply incising tidal creek but show a different response to the tidal forcing. Groundwater flow in the upper (unconfined) margin sediments can be described as a circulation of seawater, where inflow and outflow are coupled to changes in saturation. Sediments below the confining layer release groundwater from storage during falling and ebb tide and recharge during rising and high tide. We can show that tidally driven water exchange between semiconfined aquifers and coastal waters may have a major impact on total groundwater discharge.Citation: Riedel, T., K. Lettmann, M. Beck, and H.-J. Brumsack (2010), Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer,

show abstract

Section: Resultsmentioning

confidence: 99%

Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The controls on SGD of DIP from alluvial aquifers were assessed in a more general manner in a reactive transport modeling study for four idealized subterranean estuaries with variable redox conditions in the freshwater and seawater by Spiteri et al (2008b). While various studies over the past decades highlight the role of SGD as a source of DIP to the coastal zonewith SGD fluxes of DIP even being estimated to be of equal magnitude as riverine nutrient fluxes (e.g., Corbett et al, 1999;Moore et al, 2002), these and other SGD flux estimates ( Table 2) often include seawater recycling and thus do not provide insight in net terrestrial inputs of nutrients. This work also demonstrated that autotrophic denitrification with Fe 2+ and pyrite may lead to the formation of Fe oxides in aquifers that may subsequently bind P. This indicates that whether denitrification occurs via organic matter degradation or pyrite oxidation can significantly affect P dynamics in groundwater.…”

Section: Groundwatermentioning

confidence: 99%

Phosphorus Cycling in the Estuarine and Coastal Zones

Slomp

2011

Treatise on Estuarine and Coastal Science

View full text Add to dashboard Cite

“…Cable et al ., ,; Moore and Arnold, ; Garcia‐Solsona et al ., ); geophysical surveys such as airborne electromagnetics (e.g. Viezzoli et al ., ); both ground‐based and airborne thermal measurements (Taniguchi, ; Moore et al ., ; Johnson et al ., ; Danielescu et al ., ) and electrical resistivity imaging (ERI) (e.g. Swarzenski et al ., , ; Stieglitz et al ., ; Swarzenski and Izbicki, ; Cardenas et al ., ; Nakada et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Delineating coastal groundwater discharge processes in a wetland area by means of electrical resistivity imaging, ²²⁴Ra and ²²²Rn

Zarroca

Linares

Rodellas

et al. 2013

Hydrological Processes

View full text Add to dashboard Cite

Coastal groundwater discharge (CGD) plays an important role in coastal hydrogeological systems as they are a water resource that needs to be managed, particularly in wetland areas. Despite its importance, identifying and monitoring CGD often presents physical and logistical constraints, restraining the application of more traditional submarine groundwater discharge surveying techniques. Here we investigate the capability of electrical resistivity imaging (ERI) in the Peníscola wetland (Mediterranean coast, Spain). ERI surveying made it possible to identify and delineate an ascending regional groundwater flow of thermal and Ra‐enriched groundwater converging with local flows and seawater intrusion. The continuous inputs of Ra‐rich groundwater have induced high activities of Ra isotopes and 222Rn into the marsh area, becoming among the highest previously reported in wetlands and coastal lagoons. Geoelectrical imaging enabled inferring focused upward discharging areas, leaking from the aquifer roof through a confining unit and culminating as spring pools nourishing the wetland system. Forward modelling over idealized subsurface configurations, borehole datasets, potentiometric records from standpipe piezometers, petrophysical analysis, and four natural and independent tracers (224Ra, 222Rn, temperature and salinity) permitted assessing the geoelectrical model and a derived hydrogeological pattern. The research highlights the potential of ERI to improve hydrogeological characterization of subsurface processes in complex contexts, with different converging flows. Additionally, a hydrogeological conceptual model for a groundwater‐fed coastal wetland was proposed, based on the integration of surveying datasets. Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Thermal evidence of water exchange through a coastal aquifer: Implications for nutrient fluxes

Cited by 19 publications

References 0 publications

Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer

Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer

Phosphorus Cycling in the Estuarine and Coastal Zones

Delineating coastal groundwater discharge processes in a wetland area by means of electrical resistivity imaging, ²²⁴Ra and ²²²Rn

Contact Info

Product

Resources

About

Thermal evidence of water exchange through a coastal aquifer: Implications for nutrient fluxes

Cited by 19 publications

References 0 publications

Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer

Tidal variations in groundwater storage and associated discharge from an intertidal coastal aquifer

Phosphorus Cycling in the Estuarine and Coastal Zones

Delineating coastal groundwater discharge processes in a wetland area by means of electrical resistivity imaging, 224Ra and 222Rn

Contact Info

Product

Resources

About

Delineating coastal groundwater discharge processes in a wetland area by means of electrical resistivity imaging, ²²⁴Ra and ²²²Rn