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Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river

Research output: Contribution to conference - Without ISBN/ISSN Conference paper

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Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river. / Byrne, Patrick; Zhang, Hao; Heathwaite, Louise; Binley, Andrew; Ullah, Sami; Kaeser, Dan; Heppell, Catherine M.; Lansdown, Katrina; Trimmer, Mark.

2013. Paper presented at 13th International Conference on Environmental Science and Technology, Athens, Greece.

Research output: Contribution to conference - Without ISBN/ISSN Conference paper

Harvard

Byrne, P, Zhang, H, Heathwaite, L, Binley, A, Ullah, S, Kaeser, D, Heppell, CM, Lansdown, K & Trimmer, M 2013, 'Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river', Paper presented at 13th International Conference on Environmental Science and Technology, Athens, Greece, 5/09/13 - 7/09/13.

APA

Byrne, P., Zhang, H., Heathwaite, L., Binley, A., Ullah, S., Kaeser, D., Heppell, C. M., Lansdown, K., & Trimmer, M. (2013). Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river. Paper presented at 13th International Conference on Environmental Science and Technology, Athens, Greece.

Vancouver

Byrne P, Zhang H, Heathwaite L, Binley A, Ullah S, Kaeser D et al. Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river. 2013. Paper presented at 13th International Conference on Environmental Science and Technology, Athens, Greece.

Author

Byrne, Patrick ; Zhang, Hao ; Heathwaite, Louise ; Binley, Andrew ; Ullah, Sami ; Kaeser, Dan ; Heppell, Catherine M. ; Lansdown, Katrina ; Trimmer, Mark. / Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river. Paper presented at 13th International Conference on Environmental Science and Technology, Athens, Greece.8 p.

Bibtex

@conference{65e0a6e8cde74aa48b4c32ff3954229c,
title = "Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river",
abstract = "In recent years, the potential of riverbed hyporheic sediments to attenuate nitrate from polluted groundwater has received much attention. However, transformation of reactive nitrate along upwelling flow paths is dependent on redox conditions and the availability of electron donors; these biogeochemical conditions are in turn strongly dependent on hydro-morphologic drivers including riverbed structure and water flux. We worked on a 50m stretch of the River Leith, Cumbria, UK, which is dominated by upwelling nitrate-rich groundwater. Previous investigations of hyporheic connectivity and pore water chemistry in our sub-reach suggest strong groundwater upwelling might suppress the hyporheic zone, possibly restraining its ability to attenuate nitrate in the upwelling groundwater. However, this hypothesis could not be verified previously due to the difficulty of measuring pore water chemistry at depths in the riverbed <10cm. The goal of this paper is to test whether nitrate attenuation is occurring in riverbed sediments characterised by strong vertical water fluxes. We utilised diffusive equilibrium in thin-films (DET) samplers to capture high resolution (cm-scale) vertical concentration profiles of nitrate in the upper 15cm of the riverbed sediments. The vertical concentration profiles obtained from DET probes indicate considerable cm-scale variability in concentrations. However, the overall trend suggests the absence of substantial net chemical transformations and surface-subsurface water mixing in the shallow sediments of our sub-reach.",
keywords = "HYPORHEIC ZONE, DET, nitrate, Pore water Chemistry, Groundwater-fed",
author = "Patrick Byrne and Hao Zhang and Louise Heathwaite and Andrew Binley and Sami Ullah and Dan Kaeser and Heppell, {Catherine M.} and Katrina Lansdown and Mark Trimmer",
year = "2013",
language = "English",
note = "13th International Conference on Environmental Science and Technology ; Conference date: 05-09-2013 Through 07-09-2013",

}

RIS

TY - CONF

T1 - Passive pore water sampling provides evidence of suppression of hyporheic exchange and ntrate transformation in a groundwater-fed river

AU - Byrne, Patrick

AU - Zhang, Hao

AU - Heathwaite, Louise

AU - Binley, Andrew

AU - Ullah, Sami

AU - Kaeser, Dan

AU - Heppell, Catherine M.

AU - Lansdown, Katrina

AU - Trimmer, Mark

PY - 2013

Y1 - 2013

N2 - In recent years, the potential of riverbed hyporheic sediments to attenuate nitrate from polluted groundwater has received much attention. However, transformation of reactive nitrate along upwelling flow paths is dependent on redox conditions and the availability of electron donors; these biogeochemical conditions are in turn strongly dependent on hydro-morphologic drivers including riverbed structure and water flux. We worked on a 50m stretch of the River Leith, Cumbria, UK, which is dominated by upwelling nitrate-rich groundwater. Previous investigations of hyporheic connectivity and pore water chemistry in our sub-reach suggest strong groundwater upwelling might suppress the hyporheic zone, possibly restraining its ability to attenuate nitrate in the upwelling groundwater. However, this hypothesis could not be verified previously due to the difficulty of measuring pore water chemistry at depths in the riverbed <10cm. The goal of this paper is to test whether nitrate attenuation is occurring in riverbed sediments characterised by strong vertical water fluxes. We utilised diffusive equilibrium in thin-films (DET) samplers to capture high resolution (cm-scale) vertical concentration profiles of nitrate in the upper 15cm of the riverbed sediments. The vertical concentration profiles obtained from DET probes indicate considerable cm-scale variability in concentrations. However, the overall trend suggests the absence of substantial net chemical transformations and surface-subsurface water mixing in the shallow sediments of our sub-reach.

AB - In recent years, the potential of riverbed hyporheic sediments to attenuate nitrate from polluted groundwater has received much attention. However, transformation of reactive nitrate along upwelling flow paths is dependent on redox conditions and the availability of electron donors; these biogeochemical conditions are in turn strongly dependent on hydro-morphologic drivers including riverbed structure and water flux. We worked on a 50m stretch of the River Leith, Cumbria, UK, which is dominated by upwelling nitrate-rich groundwater. Previous investigations of hyporheic connectivity and pore water chemistry in our sub-reach suggest strong groundwater upwelling might suppress the hyporheic zone, possibly restraining its ability to attenuate nitrate in the upwelling groundwater. However, this hypothesis could not be verified previously due to the difficulty of measuring pore water chemistry at depths in the riverbed <10cm. The goal of this paper is to test whether nitrate attenuation is occurring in riverbed sediments characterised by strong vertical water fluxes. We utilised diffusive equilibrium in thin-films (DET) samplers to capture high resolution (cm-scale) vertical concentration profiles of nitrate in the upper 15cm of the riverbed sediments. The vertical concentration profiles obtained from DET probes indicate considerable cm-scale variability in concentrations. However, the overall trend suggests the absence of substantial net chemical transformations and surface-subsurface water mixing in the shallow sediments of our sub-reach.

KW - HYPORHEIC ZONE

KW - DET

KW - nitrate

KW - Pore water Chemistry

KW - Groundwater-fed

M3 - Conference paper

T2 - 13th International Conference on Environmental Science and Technology

Y2 - 5 September 2013 through 7 September 2013

ER -