Multipoint High-Frequency Sampling System to Gain Deeper Insights on the Fate of Nitrate in Artificially Drained Fields

AbstractThe application of high-frequency measurements could potentially enhance current understanding of the hydrology and biogeochemistry of artificially drained agricultural lands. In addition to intensive drainage flow measurements (every 15 min), two high-frequency sampling systems were implant...

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Bibliographic Details
Published in:Journal of irrigation and drainage engineering 2020-01, Vol.146 (1)
Main Authors: Liu, Wenlong, Maxwell, Bryan, Birgand, François, Youssef, Mohamed, Chescheir, George, Tian, Shiying
Format: Article
Language:English
Subjects:
Active control
Agricultural land
Biogeochemistry
Drainage systems
Drainage water
Dynamics
Groundwater
Hydrology
In situ measurement
Loads (forces)
Nitrates
Nitrogen
Rain
Rainfall
Sampling
Technical Note
Technical Notes
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Summary:AbstractThe application of high-frequency measurements could potentially enhance current understanding of the hydrology and biogeochemistry of artificially drained agricultural lands. In addition to intensive drainage flow measurements (every 15 min), two high-frequency sampling systems were implanted to monitor, on an hourly basis, nitrate-nitrogen concentrations [NO3-N] in the drainage outlet and at multiple points in the shallow groundwater. This paper provides a description of this novel in situ measurement system and reports example data obtained during a rainfall event. High-frequency measurements of [NO3-N] at the field edge could potentially advance understanding of agricultural drainage systems, including increased accuracy of (1) nitrate loading estimates, (2) spatiotemporal dynamics of nitrate export during rainfall events, and (3) nonlinear hydrochemical (C-Q) relationship. Combining high-frequency measurements of [NO3-N] in drainage water at the field edge and shallow groundwater within the field gives the opportunity for the next steps in identifying and quantifying key processes, mechanisms, hot moments, and active zones that control nitrate dynamics in drained agricultural land.
ISSN:0733-9437
1943-4774
DOI:10.1061/(ASCE)IR.1943-4774.0001438