Continuous monitoring of stream δ18O and δ2H and stormflow hydrograph separation using laser spectrometry in an agricultural catchment

Sarah Tweed, Niels Munksgaard, Vincent Marc, Nicholas Rockett, Adrian Bass, Anthony J. Forsythe, Michael I. Bird, Marc Leblanc

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    A portable Wavelength Scanned-Cavity Ring-Down Spectrometer (Picarro L2120) fitted with a diffusion sampler (DS-CRDS) was used for the first time to continuously measure δ18O and δ2H of stream water. The experiment took place during a storm event in a wet tropical agricultural catchment in north-eastern Australia. At a temporal resolution of one minute, the DS-CRDS measured 2160 δ18O and δ2H values continuously over a period of 36h with a precision of ±0.08 and 0.5‰ for δ18O and δ2H, respectively. Four main advantages in using high temporal resolution stream δ18O and δ2H data during a storm event are highlighted from this study. First, they enabled us to separate components of the hydrograph, which was not possible using high temporal resolution electrical conductivity data that represented changes in solute transfers during the storm event rather than physical hydrological processes. The results from the hydrograph separation confirm fast groundwater contribution to the stream, with the first 5h of increases in stream discharge comprising over 70% pre-event water. Second, the high temporal resolution stream δ18O and δ2H data allowed us to detect a short-lived reversal in stream isotopic values (δ18O increase by 0.4‰ over 9min), which was observed immediately after the heavy rainfall period. Third, δ18O values were used to calculate a time lag of 20min between the physical and chemical stream responses during the storm event. Finally, the hydrograph separation highlights the role of event waters in the runoff transfers of herbicides and nutrients from this heavily cultivated catchment to the Great Barrier Reef.

    Original languageEnglish
    Pages (from-to)648-660
    Number of pages13
    JournalHydrological Processes
    Volume30
    Issue number4
    DOIs
    Publication statusPublished - 15 Feb 2016

    Fingerprint

    agricultural catchment
    hydrograph
    spectrometry
    laser
    monitoring
    barrier reef
    water
    sampler
    electrical conductivity
    herbicide
    solute
    cavity
    spectrometer
    catchment
    runoff
    wavelength
    rainfall
    groundwater
    nutrient

    Cite this

    Tweed, Sarah ; Munksgaard, Niels ; Marc, Vincent ; Rockett, Nicholas ; Bass, Adrian ; Forsythe, Anthony J. ; Bird, Michael I. ; Leblanc, Marc. / Continuous monitoring of stream δ18O and δ2H and stormflow hydrograph separation using laser spectrometry in an agricultural catchment. In: Hydrological Processes. 2016 ; Vol. 30, No. 4. pp. 648-660.
    @article{aa145f4bae294b6caacfcbb04b6233e2,
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    abstract = "A portable Wavelength Scanned-Cavity Ring-Down Spectrometer (Picarro L2120) fitted with a diffusion sampler (DS-CRDS) was used for the first time to continuously measure δ18O and δ2H of stream water. The experiment took place during a storm event in a wet tropical agricultural catchment in north-eastern Australia. At a temporal resolution of one minute, the DS-CRDS measured 2160 δ18O and δ2H values continuously over a period of 36h with a precision of ±0.08 and 0.5‰ for δ18O and δ2H, respectively. Four main advantages in using high temporal resolution stream δ18O and δ2H data during a storm event are highlighted from this study. First, they enabled us to separate components of the hydrograph, which was not possible using high temporal resolution electrical conductivity data that represented changes in solute transfers during the storm event rather than physical hydrological processes. The results from the hydrograph separation confirm fast groundwater contribution to the stream, with the first 5h of increases in stream discharge comprising over 70{\%} pre-event water. Second, the high temporal resolution stream δ18O and δ2H data allowed us to detect a short-lived reversal in stream isotopic values (δ18O increase by 0.4‰ over 9min), which was observed immediately after the heavy rainfall period. Third, δ18O values were used to calculate a time lag of 20min between the physical and chemical stream responses during the storm event. Finally, the hydrograph separation highlights the role of event waters in the runoff transfers of herbicides and nutrients from this heavily cultivated catchment to the Great Barrier Reef.",
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    author = "Sarah Tweed and Niels Munksgaard and Vincent Marc and Nicholas Rockett and Adrian Bass and Forsythe, {Anthony J.} and Bird, {Michael I.} and Marc Leblanc",
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    Tweed, S, Munksgaard, N, Marc, V, Rockett, N, Bass, A, Forsythe, AJ, Bird, MI & Leblanc, M 2016, 'Continuous monitoring of stream δ18O and δ2H and stormflow hydrograph separation using laser spectrometry in an agricultural catchment', Hydrological Processes, vol. 30, no. 4, pp. 648-660. https://doi.org/10.1002/hyp.10689

    Continuous monitoring of stream δ18O and δ2H and stormflow hydrograph separation using laser spectrometry in an agricultural catchment. / Tweed, Sarah; Munksgaard, Niels; Marc, Vincent; Rockett, Nicholas; Bass, Adrian; Forsythe, Anthony J.; Bird, Michael I.; Leblanc, Marc.

    In: Hydrological Processes, Vol. 30, No. 4, 15.02.2016, p. 648-660.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Continuous monitoring of stream δ18O and δ2H and stormflow hydrograph separation using laser spectrometry in an agricultural catchment

    AU - Tweed, Sarah

    AU - Munksgaard, Niels

    AU - Marc, Vincent

    AU - Rockett, Nicholas

    AU - Bass, Adrian

    AU - Forsythe, Anthony J.

    AU - Bird, Michael I.

    AU - Leblanc, Marc

    PY - 2016/2/15

    Y1 - 2016/2/15

    N2 - A portable Wavelength Scanned-Cavity Ring-Down Spectrometer (Picarro L2120) fitted with a diffusion sampler (DS-CRDS) was used for the first time to continuously measure δ18O and δ2H of stream water. The experiment took place during a storm event in a wet tropical agricultural catchment in north-eastern Australia. At a temporal resolution of one minute, the DS-CRDS measured 2160 δ18O and δ2H values continuously over a period of 36h with a precision of ±0.08 and 0.5‰ for δ18O and δ2H, respectively. Four main advantages in using high temporal resolution stream δ18O and δ2H data during a storm event are highlighted from this study. First, they enabled us to separate components of the hydrograph, which was not possible using high temporal resolution electrical conductivity data that represented changes in solute transfers during the storm event rather than physical hydrological processes. The results from the hydrograph separation confirm fast groundwater contribution to the stream, with the first 5h of increases in stream discharge comprising over 70% pre-event water. Second, the high temporal resolution stream δ18O and δ2H data allowed us to detect a short-lived reversal in stream isotopic values (δ18O increase by 0.4‰ over 9min), which was observed immediately after the heavy rainfall period. Third, δ18O values were used to calculate a time lag of 20min between the physical and chemical stream responses during the storm event. Finally, the hydrograph separation highlights the role of event waters in the runoff transfers of herbicides and nutrients from this heavily cultivated catchment to the Great Barrier Reef.

    AB - A portable Wavelength Scanned-Cavity Ring-Down Spectrometer (Picarro L2120) fitted with a diffusion sampler (DS-CRDS) was used for the first time to continuously measure δ18O and δ2H of stream water. The experiment took place during a storm event in a wet tropical agricultural catchment in north-eastern Australia. At a temporal resolution of one minute, the DS-CRDS measured 2160 δ18O and δ2H values continuously over a period of 36h with a precision of ±0.08 and 0.5‰ for δ18O and δ2H, respectively. Four main advantages in using high temporal resolution stream δ18O and δ2H data during a storm event are highlighted from this study. First, they enabled us to separate components of the hydrograph, which was not possible using high temporal resolution electrical conductivity data that represented changes in solute transfers during the storm event rather than physical hydrological processes. The results from the hydrograph separation confirm fast groundwater contribution to the stream, with the first 5h of increases in stream discharge comprising over 70% pre-event water. Second, the high temporal resolution stream δ18O and δ2H data allowed us to detect a short-lived reversal in stream isotopic values (δ18O increase by 0.4‰ over 9min), which was observed immediately after the heavy rainfall period. Third, δ18O values were used to calculate a time lag of 20min between the physical and chemical stream responses during the storm event. Finally, the hydrograph separation highlights the role of event waters in the runoff transfers of herbicides and nutrients from this heavily cultivated catchment to the Great Barrier Reef.

    KW - Agriculture

    KW - Catchments

    KW - Groundwater

    KW - Isotopes

    KW - Light measurement

    KW - Nutrients

    KW - Rain

    KW - Runoff

    KW - Separation

    KW - Storms

    KW - Surface waters

    KW - Agricultural catchments

    KW - Continuous monitoring

    KW - Electrical conductivity

    KW - Ground-water and surface-water interaction

    KW - High temporal resolution

    KW - Hydrograph separation

    KW - Hydrological process

    KW - Temporal resolution

    KW - Rivers

    KW - agricultural catchment

    KW - groundwater-surface water interaction

    KW - herbicide

    KW - hydrograph

    KW - isotopic composition

    KW - laser

    KW - nutrient

    KW - spectrometry

    KW - stormwater

    KW - streamwater

    KW - Australia

    KW - Coral Sea

    KW - Great Barrier Reef

    KW - Queensland

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    U2 - 10.1002/hyp.10689

    DO - 10.1002/hyp.10689

    M3 - Article

    VL - 30

    SP - 648

    EP - 660

    JO - Hydrological Processes

    JF - Hydrological Processes

    SN - 0885-6087

    IS - 4

    ER -