Assessing decadal trends of a nitrate-contaminated shallow aquifer in western Nebraska using groundwater isotopes, age-dating, and monitoring

Martin J. Wells, Troy E. Gilmore, Aaron R. Mittelstet, Daniel D Snow, Steven S. Sibray

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Shallow aquifers are prone to nitrate contamination worldwide. In western Nebraska, high groundwater nitrate concentrations ([NO3 -]) have resulted in the exploration of new groundwater and nitrogen management regulations in the North Platte Natural Resources District (NPNRD). A small region of NPNRD ("Dutch Flats") was the focus of intensive groundwater sampling by the United States Geological Survey from 1995 to 1999. Nearly two decades later, notable shifts have occurred in variables related to groundwater recharge and [NO3 -], including irrigation methods. The objective of this study was to evaluate how changes in these variables, in part due to regulatory changes, have impacted nitrate-contaminated groundwater in the Dutch Flats area. Groundwater samples were collected to assess changes in: (1) recharge rates; (2) biogeochemical processes; and (3) [NO3 -]. Groundwater age increased in 63% of wells and estimated recharge rates were lower for 88% of wells sampled (n = 8). However, mean age and recharge rate estimated in 2016 (19.3 years; R = 0.35 m/year) did not differ significantly from mean values determined in 1998 (15.6 years; R = 0.50 m/year). δ15N-NO3 - (n = 14) and dissolved oxygen data indicate no major changes in biogeochemical processes. Available long-term data suggest a downward trend in normalized [NO3 -] from 1998 to 2016, and lower [NO3 -] was observed in 60% of wells sampled in both years (n = 87), but median values were not significantly different. Collectively, results suggest the groundwater system is responding to environmental variables to a degree that is detectable (e.g., trends in [NO3 -]), although more time and/or substantial changes may be required before it is possible to detect significantly different mean recharge.

Original languageEnglish (US)
Article number1047
JournalWater (Switzerland)
Volume10
Issue number8
DOIs
StatePublished - Aug 7 2018

Fingerprint

Geochronology
Groundwater
Aquifers
Isotopes
Nitrates
aquifers
natural resources
isotopes
groundwater
nitrates
aquifer
isotope
district
monitoring
nitrate
Monitoring
recharge
trend
irrigation
environmental pollution

Keywords

  • Center pivot irrigation
  • Groundwater age
  • Groundwater monitoring
  • Groundwater nitrate
  • Groundwater recharge rates
  • Groundwater transit time
  • H/He
  • Isotopes
  • Non-point source pollution
  • Surface irrigation

ASJC Scopus subject areas

  • Biochemistry
  • Geography, Planning and Development
  • Aquatic Science
  • Water Science and Technology

Cite this

Assessing decadal trends of a nitrate-contaminated shallow aquifer in western Nebraska using groundwater isotopes, age-dating, and monitoring. / Wells, Martin J.; Gilmore, Troy E.; Mittelstet, Aaron R.; Snow, Daniel D; Sibray, Steven S.

In: Water (Switzerland), Vol. 10, No. 8, 1047, 07.08.2018.

Research output: Contribution to journalArticle

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abstract = "Shallow aquifers are prone to nitrate contamination worldwide. In western Nebraska, high groundwater nitrate concentrations ([NO3 -]) have resulted in the exploration of new groundwater and nitrogen management regulations in the North Platte Natural Resources District (NPNRD). A small region of NPNRD ({"}Dutch Flats{"}) was the focus of intensive groundwater sampling by the United States Geological Survey from 1995 to 1999. Nearly two decades later, notable shifts have occurred in variables related to groundwater recharge and [NO3 -], including irrigation methods. The objective of this study was to evaluate how changes in these variables, in part due to regulatory changes, have impacted nitrate-contaminated groundwater in the Dutch Flats area. Groundwater samples were collected to assess changes in: (1) recharge rates; (2) biogeochemical processes; and (3) [NO3 -]. Groundwater age increased in 63{\%} of wells and estimated recharge rates were lower for 88{\%} of wells sampled (n = 8). However, mean age and recharge rate estimated in 2016 (19.3 years; R = 0.35 m/year) did not differ significantly from mean values determined in 1998 (15.6 years; R = 0.50 m/year). δ15N-NO3 - (n = 14) and dissolved oxygen data indicate no major changes in biogeochemical processes. Available long-term data suggest a downward trend in normalized [NO3 -] from 1998 to 2016, and lower [NO3 -] was observed in 60{\%} of wells sampled in both years (n = 87), but median values were not significantly different. Collectively, results suggest the groundwater system is responding to environmental variables to a degree that is detectable (e.g., trends in [NO3 -]), although more time and/or substantial changes may be required before it is possible to detect significantly different mean recharge.",
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