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

Wenlong Liu, Bryan Maxwell, François Birgand, Mohamed Youssef, George Chescheir, Shiying Tian

Research output: Contribution to journalArticlepeer-review

Abstract

The 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.

Original languageEnglish (US)
Article number06019012
JournalJournal of Irrigation and Drainage Engineering
Volume146
Issue number1
DOIs
StatePublished - Jan 1 2020
Externally publishedYes

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Agricultural and Biological Sciences (miscellaneous)

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