Flow reversals in groundwater–lake interactions: A natural tracer study using δ18O

Hajati, Mithra‐Christin; Frandsen, Mette; Pedersen, Ole; Nilsson, Bertel; Duque, Carlos; Engesgaard, Peter

doi:10.1016/j.limno.2017.04.006

Cited by 11 publications

(19 citation statements)

References 25 publications

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“…Many of the samples grouped around values near δ 18 O = −7.6% and δD = −47% , corresponding to freshwater ( Figure 5). These values were similar to groundwater in other regions of Denmark [50][51][52][53]. There was no evidence of fractionation of freshwater samples, as all grouped together with no outliers.…”

Section: Physical Tracers Of Flow (Ec Stable Isotopes Of Water and Gsupporting

confidence: 71%

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Duque

Jessen

Tirado-Conde

et al. 2019

Water

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Submarine groundwater discharge (SGD)—including terrestrial freshwater, density-driven flow at the saltwater–freshwater interface, and benthic exchange—can deliver nutrients to coastal areas, generating a negative effect in the quality of marine water bodies. It is recognized that water stable isotopes (18O and 2H) can be helpful tracers to identify different flow paths and origins of water. Here, we show that they can be also applied when assessing sources of nutrients to coastal areas. A field site near a lagoon (Ringkøbing Fjord, Denmark) has been monitored at a metric scale to test if stable isotopes of water can be used to achieve a better understanding of the hydrochemical processes taking place in coastal aquifers, where there is a transition from freshwater to saltwater. Results show that 18O and 2H differentiate the coastal aquifer into three zones: Freshwater, shallow, and deep saline zones, which corresponded well with zones having distinct concentrations of inorganic phosphorous. The explanation is associated with three mechanisms: (1) Differences in sediment composition, (2) chemical reactions triggered by mixing of different type of fluxes, and (3) biochemical and diffusive processes in the lagoon bed. The different behaviors of nutrients in Ringkøbing Fjord need to be considered in water quality management. PO4 underneath the lagoon exceeds the groundwater concentration inland, thus demonstrating an intra-lagoon origin, while NO3, higher inland due to anthropogenic activity, is denitrified in the study area before reaching the lagoon.

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Section: Physical Tracers Of Flow (Ec Stable Isotopes Of Water and Gsupporting

confidence: 71%

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Duque

Jessen

Tirado-Conde

et al. 2019

Water

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“…As an example, Schneider et al () showed how the spatial patterns in groundwater discharge were surprisingly unrelated to surface texture. The presence of vegetation has been documented recently as a potential barrier for groundwater flow in lake environments (Hajati et al, ; Karan et al, ).…”

Section: Discussionmentioning

confidence: 99%

A conceptual model for groundwater discharge to a coastal brackish lagoon based on seepage measurements (Ringkøbing Fjord, Denmark)

Duque

Haider

Sebok

et al. 2018

Hydrological Processes

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Groundwater discharge to a brackish lagoon (Ringkøbing Fjord) was quantified with seepage meters along four transects perpendicular to the shore during four seasons in 1 year. The objectives were to develop a conceptual model of the spatiotemporal variability of seepage and how landscape characteristics and saltwater intrusion affect seepage fluxes. The electrical conductivity of the groundwater was measured in vertical sediment profiles up to 3 m below the lagoon bed to assess the effects of the freshwater-saltwater interface location on flux distribution. The main differences compared with existing theoretical models are a lower discharge near the shore line (0-5 m) and two discharge peaks more offshore (15-20 and >25 m), which allowed the development of a conceptual model that is different from the classical concepts introduced for marine or lake environments and which can be representative of other similar areas. These differences are explained by the vegetation and organic material deposition in the near-shore environment reducing discharge, the presence of the saline wedge leading to upward flow, and the increase of recirculation of brackish water due to wave pumping in areas offshore most exposed to the wind. The seasonal variability in discharge is smaller than the spatial variability between and within transects along the shoreline. Based on the conceptual model, fresh water discharge in a 20-m-wide fringe was calculated to be between 66 and 388 L·day −1 ·m −1 shore line, corresponding to a difference of a factor of six due to the variations in coast morphology and local characteristics of the area. The seasonal changes were responsible for changes of only 8% to 75% depending on the location. KEYWORDS groundwater discharge to lagoon, seepage meter, spatial-temporal variability, variable salinity

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“…Abiogenic alcohol is generally obtained by hydrating ethylene with steam under pressure in the presence of a catalyst. Given that in the molecule in addition to carbon atoms of the alcohol also includes oxygen and hydrogen, it can be assumed that the relationship isotope 18 O/ 16 O and D/H can be significantly different from the relationship of oxygen and hydrogen isotopes alcohols of plant origin. Indeed, the oxygen of the technical water involved in the reaction for obtaining abiogenic alcohol is much easier than the oxygen of the aqueous component of plant raw materials [11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

mentioning

confidence: 99%

“…Methods. The instrumental base for obtaining characteristics of the isotopic composition of ethanol molecules elements was the Thermo Fisher Scientific (USA) mass spectrometer complex Delta V Advantage, which provides a precise analysis of the prevalence ratios of 13 C/ 12 C, 18 O/ 16 O, D/H isotopes.…”

mentioning

confidence: 99%

“…The obtained ratios of carbon isotopes ( 13 C/ 12 C), oxygen ( 18 O/ 16 O) and hydrogen (D/H) were determined in ‰, using the software of a mass spectrometer, using formula Results and its discussion. The isotopic characteristics of д 13 C, д 18 O and дD ‰ of abiogenic alcohols, as well as alcohols from various types of plant raw materials, were studied. The results are summarized in table 1.…”

mentioning

confidence: 99%

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Isotope Mass Spectrometry Application for the Abiogenic Alcohols Detection in Grape Wines

Oganesyants¹,

Panasyuk²,

Кузьмина³

et al. 2019

SERIES OF GEOLOGY AND TECHNICAL SCIENCES

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Flow reversals in groundwater–lake interactions: A natural tracer study using δ18O

Cited by 11 publications

References 25 publications

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

A conceptual model for groundwater discharge to a coastal brackish lagoon based on seepage measurements (Ringkøbing Fjord, Denmark)

Isotope Mass Spectrometry Application for the Abiogenic Alcohols Detection in Grape Wines

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