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

Rapaglia, John; Krupa, Steven C.

doi:10.1007/bf03036520

Cited by 13 publications

(14 citation statements)

References 28 publications

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“…Still, the radon maximum shows sharp gradients towards the neighboring sampling locations, indicating a location of rather focused SGD close to the harbor structures. Considering comparable findings [19,20], the data suggests an anthropogenic impact on the coastal aquifer as a possible reason for the indicated locally increased SGD rate. It can be assumed that a perturbation of the local calcareous aquifer by the pilings of the harbor construction results in preferential flow paths, thereby producing a comparatively high groundwater seepage rate locally.…”

Section: Western Study Areasupporting

confidence: 49%

Evidence for Submarine Groundwater Discharge into the Black Sea—Investigation of Two Dissimilar Geographical Settings

Schubert

Knöller

Stollberg

et al. 2017

Water

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Abstract:The sustainable management of coastal marine environments requires a comprehensive understanding of the processes related to material transport from land to coastal sea. Besides surface water discharge (e.g., rivers and storm drains), submarine groundwater discharge (SGD) plays a key role since it provides a major pathway for solute and particulate transport of contaminants and nutrients, both having considerable potential to cause deterioration of the overall ecological status of coastal environments. The aim of the presented study was the investigation of SGD in two exemplary and dissimilar areas at the Black Sea coast, one in the west (Romania) and one in the east (Georgia). The approach included the assessment of the geological/geographical setting regarding the potential of SGD occurrence, the use of environmental tracer data ( 222 Rn, δ 18 O, δ 2 H, salinity), and the evaluation of sea surface temperature patterns near the coastline using satellite data. Besides the individual site specific results, the study revealed that a combined evaluation of tracer data and satellite based information allows SGD localization with satisfying precision. A downscaling approach starting with large scale satellite data is generally recommended, continuing with medium scale tracer patterns and ending with local spot sampling.

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Section: Western Study Areasupporting

confidence: 49%

Evidence for Submarine Groundwater Discharge into the Black Sea—Investigation of Two Dissimilar Geographical Settings

Schubert

Knöller

Stollberg

et al. 2017

Water

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“…This is an expected pattern in situations where SGD is driven by onshore hydraulic gradients. However, other expected patterns, such as an exponential decrease in SGD with distance from the shoreline, were not observed [ Bokuniewicz , 1980; Stieglitz et al , 2007]. Seepage rates did, however, decrease with (alongshore) distance from the pier (Figure 3).…”

Section: Resultsmentioning

confidence: 79%

“…The results presented here represent a subset of BGC and flow data collected at the different study sites. Some of the presented data from West Neck Bay, Ubatuba, and Flic‐en‐Flac have been reported previously in a different context [ Stieglitz et al , 2007, 2008; Bokuniewicz et al , 2007]. Data are presented in chronological order.…”

Section: Resultsmentioning

confidence: 86%

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Estimation of submarine groundwater discharge from bulk ground electrical conductivity measurements

Rapaglia¹,

Bokuniewicz²

2008

J. Geophys. Res.

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The utility of bulk ground conductivity (BGC) measurements in the estimation of submarine groundwater discharge (SGD) was investigated at four sites covering a range of hydrogeological settings, namely Cockburn Sound (Australia); Shelter Island (USA); Ubatuba Bay (Brazil) and Flic‐en‐Flac Bay (Mauritius). At each of the sites, BGC was surveyed in the intertidal zone, and seepage meters were used for direct measurements of SGD flow rates. In the presence of detectable salinity gradients in the sediment, a negative correlation between SGD and BGC was recorded. The correlation is site‐specific and is dependent on both the type of sediment and the mixing processes. For example, at Shelter Island the maximum mean flow rates were 65 cm d−1 at a BGC of ∼0 mS cm−1 while at Mauritius maximum mean flow rates were 364 cm d−1 at a BGC of ∼0 mS cm−1. BGC measurements are used to estimate SGD over a large scale, and to separate its fresh and saline components. Extrapolating BGC measurements throughout the study sites yields a total discharge of 2.91, 1.59, 7.16, and 25.4 103 m3 d−1 km−1 of shoreline with a freshwater fraction of 41, 24, 29, and 63% at Cockburn Sound, Shelter Island, Ubatuba Bay, and Flic‐en‐Flac Bay respectively. The results demonstrate that ground conductivity is a useful tracer to survey and separate freshwater and recirculated seawater component of SGD. The presented investigation is a subset within a series of experiments designed to compare different methods to investigate SGD co‐organized and carried out by SCOR, LOICZ, IOC and IAEA.

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Determining groundwater Ra end‐member values for the estimation of the magnitude of submarine groundwater discharge using Ra isotope tracers

Cho

Kim

2016

Geophysical Research Letters

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Radium isotopes (228Ra and 226Ra) are excellent tracers of submarine groundwater discharge (SGD). To estimate SGD magnitudes, information on the end‐member values of Ra concentrations in groundwater is critical; however, the distribution characteristics of Ra in coastal aquifers are poorly understood. In this study, we show that Ra concentrations in coastal groundwater are primarily dependent on salinity based on the data (n > 500) obtained from global coastal aquifers, although previous end‐member calculations averaged all Ra concentrations without considering salinity. If we assume that SGD is composed mainly of seawater infiltrating the aquifer, previous estimates of SGD for the Atlantic Ocean and the global ocean were overestimated twofold to threefold. This may be similar for other applications using different Ra isotopes. Our study highlights that the end‐members of Ra isotopes in groundwater should be carefully considered when estimating SGD using Ra isotope mass balances in the ocean.

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

Cited by 13 publications

References 28 publications

Evidence for Submarine Groundwater Discharge into the Black Sea—Investigation of Two Dissimilar Geographical Settings

Evidence for Submarine Groundwater Discharge into the Black Sea—Investigation of Two Dissimilar Geographical Settings

Estimation of submarine groundwater discharge from bulk ground electrical conductivity measurements

Determining groundwater Ra end‐member values for the estimation of the magnitude of submarine groundwater discharge using Ra isotope tracers

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