Seasonal variation in tap water δ2H and δ18O isotopes reveals two tap water worlds

Wet, Ruan De; West, Adam G.; Harris, Chris

doi:10.1038/s41598-020-70317-2

Cited by 22 publications

(17 citation statements)

References 29 publications

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“…A single sample of deep subpermafrost groundwater was depleted in 18 O, with high d-excess and isotopic signature consistent with that of a confined groundwater, plotting below rainfall and unconfined groundwater sources [42] (Table 2 and Figure 3).…”

Section: Water Stable Isotopesmentioning

confidence: 77%

Hydrological Connectivity in a Permafrost Tundra Landscape near Vorkuta, North-European Arctic Russia

Tananaev¹,

Исаев²,

Sergeev³

et al. 2021

Preprint

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Hydrochemical and geophysical data collected during a hydrological survey in September 2017, reveal patterns of small-scale hydrological connectivity in a small water track catchment, north-European Arctic. Elevated tundra patches underlain by sands were disconnected from the stream and stored precipitation water from previous months. At the catchment surface and in the water track thalweg, some circular hollows, from 0.2 to 0.4 m in diameter, acted as evaporative basins with low d-excess values, from 2 to 4&permil;. Other hollows were connected to shallow subsurface runoff, yielding d-excess values between 12 and 14&permil;. ‘Connected’ hollows yielded a 50% higher dissolved organic carbon (DOC) content, 17.5±5.3 mg/L, than the ‘disconnected hollows, 11.8±1.7 mg/L. Permafrost distribution across the landscape is continuous, but highly variable. Open taliks exist under fens and small hummocky depressions, as revealed by electric resistivity tomography surveys. Isotopic evidence supports upward subpermafrost groundwater migration through open taliks under water tracks and fens/bogs/depressions, and its supply to streams via shallow sub-surface compartment. Temporal variability of isotopic composition and DOC in water track and a major river system, the Vorkuta R., evidence the widespread occurrence of the described processes in the large river basin. Water tracks effectively drain the tundra terrain and maintain xeric veg-etation over the elevated inter-track tundra patches.

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Section: Water Stable Isotopesmentioning

confidence: 77%

Hydrological Connectivity in a Permafrost Tundra Landscape near Vorkuta, North-European Arctic Russia

Tananaev¹,

Исаев²,

Sergeev³

et al. 2021

Preprint

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“…The isotopic signatures of the tap water sources varied spatially, as their sources are recharged at various altitudes (West et al, 2014;Wet et al, 2020;Zhao et al, 2017). The spatiotemporal variations therefore represent the use of isotopically distinguishable local water sources (Shakya et al, 2019a).…”

Section: Stable Isotopes Of Reservoir and Tap Watermentioning

confidence: 99%

“…Additionally, stable isotopes especially δD is unaffected by the pre-treatment processes. With all the advantages, stable isotopes have been used to determine the water dynamics in urban areas with CWS (Bowen et al, 2007;de Wet et al, 2020;Ehleringer et al, 2016;Jameel et al, 2018;Tipple et al, 2017;Zhao et al, 2017). As CWS does not experience foreign intrusions (Erickson et al, 2017), the dependency on isotopic signatures for tap water conditions and dynamics in an IWS setting presents challenges.…”

Section: Introductionmentioning

confidence: 99%

Tap Water Quality Degradation in an Intermittent Water Supply Area

Shakya

Nakamura

Shrestha

et al. 2022

Water Air Soil Pollut

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Decentralized tap water systems are an important drinking water source worldwide. A good quality, high-pressure continuous water supply (CWS) is always the target of any urban settlement. However, tap water in some areas are reported with deteriorated water quality even though treated well before supplying. Such deterioration of tap water quality is reported widely from areas with low water availability and in economically poor countries where water are supplied intermittently (IWS). This study focuses in identifying tap water quality in IWS and causes of water quality degradation using nitrate-nitrogen (NO3-N) as an indicator and stable isotopes of hydrogen (δD) as tracer. Nine water reservoirs and ninety municipal tap water (ten per reservoir) samples were collected during the wet (June–September) and dry (November–February) seasons in the Kathmandu Valley (KV), Nepal. Ten percent of the tap water samples exhibited higher NO3-N than those of their respective reservoirs during the wet season, while 16% exhibited higher concentrations during the dry season. Similarly, the isotopic signatures of tap water exhibited 3% and 23% higher concentrations than those of their respective reservoirs during the wet and dry seasons, respectively. Coupling analysis between NO3-N and δD demonstrates close connection of groundwater and tap water. The results indicate groundwater intrusion as the primary component in controlling tap water quality variations within the same distribution networks during IWS. Meanwhile, the obtained results also indicate probable areas of intrusion in the KV as well as usefulness of δD as a tool in the assessment of tap water systems.

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“…However, it is highly variable across water body Below the point cloud comprised mostly of surface waters, two separate end members are plotted in the opposite corners of the d-excess-δ 18 O diagram (Figure 4). In the top left corner, a single sample of deep subpermafrost groundwater is plotted, depleted in heavy 18 O isotope, with high d-excess and isotopic signature consistent with that of a confined groundwater aquifer [45]. In the bottom right corner, samples that have undergone substantial evaporative loss are plotted, as discussed above, including the lake and several hollows (Figure 4).…”

Section: Dissolved Organic Carbonmentioning

confidence: 99%

Hydrological Connectivity in a Permafrost Tundra Landscape near Vorkuta, North-European Arctic Russia

et al. 2021

View full text Add to dashboard Cite

Hydrochemical and geophysical data collected during a hydrological survey in September 2017, reveal patterns of small-scale hydrological connectivity in a small water track catchment in the north-European Arctic. The stable isotopic composition of water in different compartments was used as a tracer of hydrological processes and connectivity at the water track catchment scale. Elevated tundra patches underlain by sandy loams were disconnected from the stream and stored precipitation water from previous months in saturated soil horizons with low hydraulic conductivity. At the catchment surface and in the water track thalweg, some circular hollows, from 0.2 to 0.4 m in diameter, acted as evaporative basins with low deuterium excess (d-excess) values, from 2‰ to 4‰. Observed evaporative loss suggests that these hollows were disconnected from the surface and shallow subsurface runoff. Other hollows were connected to shallow subsurface runoff, yielding d-excess values between 12‰ and 14‰, close to summer precipitation. ‘Connected’ hollows yielded a 50% higher dissolved organic carbon (DOC) content, 17.5 ± 5.3 mg/L, than the ‘disconnected’ hollows, 11.8 ± 1.7 mg/L. Permafrost distribution across the landscape is continuous but highly variable. Open taliks exist under fens and hummocky depressions, as revealed by electric resistivity tomography surveys. Isotopic evidence supports upward subpermafrost groundwater migration through open taliks under water tracks and fens/bogs/depressions and its supply to streams via shallow subsurface compartment. Temporal variability of isotopic composition and DOC in water track and a major river system, the Vorkuta River, evidence the widespread occurrence of the described processes in the large river basin. Water tracks effectively drain the tundra terrain and maintain xeric vegetation over the elevated intertrack tundra patches.

show abstract

Seasonal variation in tap water δ2H and δ18O isotopes reveals two tap water worlds

Cited by 22 publications

References 29 publications

Hydrological Connectivity in a Permafrost Tundra Landscape near Vorkuta, North-European Arctic Russia

Hydrological Connectivity in a Permafrost Tundra Landscape near Vorkuta, North-European Arctic Russia

Tap Water Quality Degradation in an Intermittent Water Supply Area

Hydrological Connectivity in a Permafrost Tundra Landscape near Vorkuta, North-European Arctic Russia

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