Spatial and temporal distributions of submarine groundwater discharge rates obtained from various types of seepage meters at a site in the Northeastern Gulf of Mexico

Taniguchi, Makoto; Burnett, William C.; Smith, Christopher F.; Paulsen, Ronald J.; O'Rourke, Daniel J.; Krupa, Steven L.; Christoff, Jamie

doi:10.1023/b:biog.0000006090.25949.8d

Cited by 129 publications

(56 citation statements)

References 38 publications

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“…All automated flow meters were calibrated in the laboratory prior to the taking of measurements (as described in Krupa et al 1998;Paulsen et al 2001;Sholkovitz et al 2003). The results obtained with the different types of flow meters are in close agreement with each other when the meters are deployed in comparable conditions (Taniguchi et al 2003). Ambient surface water salinity and salinity of the water collected from the manual seepage chambers were measured using a refractometer, and the salinity inside the chambers of the heat-pulse and dye-dilution seepage meters was measured with a YSI sensor.…”

Section: Bulk Ground Conductivity Measurementmentioning

confidence: 76%

An effect of pier pilings on nearshore submarine groundwater discharge from a (partially) confined aquifer

Rapaglia

Krupa

2007

Estuaries and Coasts: J ERF

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ABSTRACT:Concurrent bulk ground conductivity mapping and direct measurements of seepage rates were carried out near a pier at Shelter Island, New York, U.S.A. A shallow sediment layer was identified to provide confinement for lower aquifer units. The conductivity and seepage rate data indicate that pilings of the pier apparently pierce this shallow sediment layer, producing a comparatively high seepage rate driven by the hydraulic head of the (partially) confined aquifer, resulting in a substantial increase in submarine groundwater discharge (SGD) near the pier. Seepage rate measurements made close to the pier, which runs perpendicular to the shoreline, cannot be considered representative for the area. At the study site, the magnitude of SGD depends both on the distance from shore and on the distance from the pier, a rmding that confounds the commonly observed patterns of decreasing SGD with increasing distance from shore. This alteration of a groundwater flow pattern is a previously undescribed effect of anthropogenic perturbation in a coastal system.

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Section: Bulk Ground Conductivity Measurementmentioning

confidence: 76%

An effect of pier pilings on nearshore submarine groundwater discharge from a (partially) confined aquifer

Rapaglia

Krupa

2007

Estuaries and Coasts: J ERF

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“…As Lewandowski et al [8] reported, the biogeochemical turnover of nitrogen is common at the reactive aquifer-lake interface, in particular when driven by local water circulations. Furthermore, local water cycles driven by wind waves activated water and solute exchange between two water bodies at the lakeshore bottom (Figures 4d,h and 8), which were previously commonly considered to be stagnant zones [51,52].…”

Section: Discussionmentioning

confidence: 91%

Simulating the Effects of Lake Wind Waves on Water and Solute Exchange across the Lakeshore Using Hydrus-2D

Šimůnek

Wang

et al. 2017

Water

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Abstract:Wind waves, which frequently occur on large surface water bodies such as lakes, may temporarily alter flow patterns in a subsurface zone and the corresponding water and nutrient interactions between surface waters and shallow groundwaters. To better understand these processes, soil flume experiments were carried out to investigate wind wave-driven water and chloride interactions across the lake-groundwater interface, and the Hydrus-2D model was used to analyze and evaluate the observed experimental results. Two interaction cases between the lake and groundwater systems were considered: groundwater discharging into a lake (the GDL case), and lake water recharging groundwater (the LRG case). For comparison, no-wave conditions for both the GDL and LRG cases were also analyzed. The results revealed that, similarly to no-wave conditions, water and chloride exchange fluxes between the lake and groundwater systems under wave conditions occurred mainly within narrow bands near the intersection of the water level in the lake and the interface in both the GDL and LRG cases, and then exponentially decreased along the interface. Most water and chloride that infiltrated into the subsurface zone through the upper part of the interface during a wave crest returned to the lake through the lower part during a wave trough in both the GDL and LRG cases, creating local recirculation zones in the subsurface near the interface. Such recirculation produced a more frequent exchange of water and solute across the interface compared with those under no-wave conditions. During a one-day period after wind waves started, the total exchange fluxes of water and chloride to the lake decreased by 36.2% and 71.9%, respectively, compared to the no-wave conditions in the GDL case. In the LRG case, the total exchange water fluxes to the subsurface increased by 89.7%, while the total exchange chloride fluxes increased only slightly (4.5%) compared to the no-wave conditions due to the difference in chloride concentrations between the upper and lower parts of the interface. The sensitivity analysis revealed that the hydraulic conductivity of the lakeshore zone and the characteristics of the waves were important factors influencing water and chloride exchange between the lake and groundwater systems. The simulated results helped us to better understand water and solute interactions in the lake-groundwater system during windy periods.

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“…Seepage meters have been criticized as prone to artifacts (Shaw and Prepas, 1989;Shinn et al, 2002). However, recent intercomparisons between seepage meters and other means of estimating SGD suggest seepage meters can give reasonable SGD estimates when used properly (Corbett and Cable, 2003;Lambert and Burnett, 2003;Taniguchi et al, 2003).…”

Section: Seepage Meter Resultsmentioning

confidence: 99%

Submarine groundwater discharge to a small estuary estimated from radon and salinity measurements and a box model

et al. 2005

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Abstract. Submarine groundwater discharge was quantified by a variety of methods for a 4-day period during the early summer of 2004, in Salt Pond, adjacent to Nauset Marsh, on Cape Cod, USA. Discharge estimates based on radon and salinity took advantage of the presence of the narrow channel connecting Salt Pond to Nauset Marsh, which allowed constructing whole-pond mass balances as water flowed in and out due to tidal fluctuations. The data suggest that less than one quarter of the discharge in the vicinity of Salt Pond happened within the pond itself, while three quarters or more of the discharge occurred immediately seaward of the pond, either in the channel or in adjacent regions of Nauset Marsh. Much of this discharge, which maintains high radon activities and low salinity, is carried into the pond during each incoming tide. A box model was used as an aid to understand both the rates and the locations of discharge in the vicinity of Salt Pond. The model achieves a reasonable fit to both the salinity and radon data assuming submarine groundwater discharge is fresh and that most of it occurs either in the channel or in adjacent regions of Nauset Marsh. Salinity and radon data, together with seepage meter results, do not rule out discharge of saline groundwater, but suggest either that the saline discharge is at most comparable in volume to the fresh discharge or that it is depleted in radon. The estimated rate of fresh groundwater discharge in the vicinity of Salt Pond is 3000-7000 m 3 d −1 . This groundwater flux estimated from the radon and salinity data is comparable to a value of 3200-4500 m 3 d −1 predicted by a recent hydrologic model (Masterson, 2004; Colman and Masterson, 2004), although the model predicts this rate of discharge to the pond whereas our data suggest most of the groundwater bypasses the pond Correspondence to: J. Crusius (jcrusius@usgs.gov) prior to discharge. Additional work is needed to determine if the measured rate of discharge is representative of the longterm average, and to better constrain the rate of groundwater discharge seaward of Salt Pond.

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Spatial and temporal distributions of submarine groundwater discharge rates obtained from various types of seepage meters at a site in the Northeastern Gulf of Mexico

Cited by 129 publications

References 38 publications

An effect of pier pilings on nearshore submarine groundwater discharge from a (partially) confined aquifer

An effect of pier pilings on nearshore submarine groundwater discharge from a (partially) confined aquifer

Simulating the Effects of Lake Wind Waves on Water and Solute Exchange across the Lakeshore Using Hydrus-2D

Submarine groundwater discharge to a small estuary estimated from radon and salinity measurements and a box model

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