Use of tritium and helium to define groundwater flow conditions in Everglades National Park

René M. Price, Zafer Top, James D Happell, Peter K Swart

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The concentrations of tritium (3H) and helium isotopes ( 3He and 4He) were used as tracers of groundwater flow in the surficial aquifer system (SAS) beneath Everglades National Park (ENP), south Florida. From ages determined by 3H/3He dating techniques, groundwater within the upper 28 m originated within the last 30 years. Below 28 m, waters originated prior to 30 years before present with evidence of mixing at the interface. Interannual variation of the 3H/3He ages within the upper 28 m was significant throughout the 3 year investigation, corresponding with varying hydrologic conditions. In the region of Taylor Slough Bridge, younger groundwater was consistently detected below older groundwater in the Biscayne Aquifer, suggesting preferential flow to the lower part of the aquifer. An increase in He with depth in the SAS indicated that radiogenic 4He produced in the underlying Hawthorn Group migrates into the SAS by diffusion. Higher Δ4He values in brackish groundwaters compared to fresh waters from similar depths suggested a possible enhanced vertical transport of 4He in the seawater mixing zone. Groundwater salinity measurements indicated the presence of a wide (6-28 km) seawater mixing zone. Comparison of groundwater levels with surface water levels in this zone indicated the potential for brackish groundwater discharge to the overlying Everglades surface water.

Original languageEnglish (US)
JournalWater Resources Research
Volume39
Issue number9
StatePublished - Sep 2003

Fingerprint

Helium
helium
Groundwater flow
tritium
Tritium
groundwater flow
Groundwater
national parks
national park
groundwater
aquifers
Aquifers
aquifer
Surface waters
Seawater
seawater
Salinity measurement
Crataegus
preferential flow
surface water

Keywords

  • Everglades
  • Groundwater
  • Helium
  • Isotopes
  • South Florida
  • Tritium

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Aquatic Science
  • Water Science and Technology

Cite this

Use of tritium and helium to define groundwater flow conditions in Everglades National Park. / Price, René M.; Top, Zafer; Happell, James D; Swart, Peter K.

In: Water Resources Research, Vol. 39, No. 9, 09.2003.

Research output: Contribution to journalArticle

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