Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia

L. N. Plummer, E. Busenberg, J. B. McConnell, S. Drenkard, Peter Schlosser, R. L. Michel

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

The quality of water ill the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl-, 3H, tritiogenic helium-3 (3He), chlorofluorocarbons (CFC-11, CFC-12, CFC-113), organic C (DOC), O2 (DO), H2S, CH4, δ18O, δD, and 14C were investigated as tracers of Withlacoochee River water in the Upper Floridan aquifer. The concentrations of all tracers were affected by dilution and mixing. Dissolved Cl-, δ18O, δD, CFC-12, and the quantity (3H + 3He) are stable in water from the Upper Floridan aquifer, whereas DOC, DO, H2S, CH4, 14C, CFC- 11, and CFC-113 are affected by microbial degradation and other geochemical processes occurring within the aquifer. Groundwater mixing fractions were determined by using dissolved Cl- and δ18O data, recognizing 3 end-member water types in the groundwater mixtures: (1) Withlacoochee River water (δ18O = -2.5 ± 0.3‰, Cl-= 12.2 ± 2 mg/l), (2) regional infiltration water (δ18O = -4.2 ± 0.1‰o Cl-=2.3±0.1 mg/l), and (3) regional paleowater resident in the Upper Floridan aquifer (δ18O = - 3.4 ± 0.1‰, Cl- = 2.6 ± 0.1 mg/l) (uncertainties are + lσ). Error simulation procedures were used to define uncertainties in mixing fractions. Fractions of river water in groundwater range from 0 to 72% and average 10%. The influence of river-water discharge on the quality of water in the Upper Floridan aquifer was traced from the sinkhole area on the Withlacoochee River 25 km SE in the direction of regional groundwater flow. Infiltration of water is most significant to the N and NW of Valdosta, but becomes negligible to the S and SE in the direction of general thickening of post-Eocene confining beds overlying the Upper Floridan aquifer.

Original languageEnglish (US)
Pages (from-to)995-1015
Number of pages21
JournalApplied Geochemistry
Volume13
Issue number8
DOIs
StatePublished - Nov 1 1998
Externally publishedYes

Fingerprint

Calcium Carbonate
CFC
Limestone
Aquifers
river water
Groundwater
Chlorofluorocarbons
Rivers
limestone
aquifer
groundwater
Water
sinkhole
tracer
water
helium
infiltration
Helium
Infiltration
Discharge (fluid mechanics)

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

Cite this

Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia. / Plummer, L. N.; Busenberg, E.; McConnell, J. B.; Drenkard, S.; Schlosser, Peter; Michel, R. L.

In: Applied Geochemistry, Vol. 13, No. 8, 01.11.1998, p. 995-1015.

Research output: Contribution to journalArticle

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abstract = "The quality of water ill the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl-, 3H, tritiogenic helium-3 (3He), chlorofluorocarbons (CFC-11, CFC-12, CFC-113), organic C (DOC), O2 (DO), H2S, CH4, δ18O, δD, and 14C were investigated as tracers of Withlacoochee River water in the Upper Floridan aquifer. The concentrations of all tracers were affected by dilution and mixing. Dissolved Cl-, δ18O, δD, CFC-12, and the quantity (3H + 3He) are stable in water from the Upper Floridan aquifer, whereas DOC, DO, H2S, CH4, 14C, CFC- 11, and CFC-113 are affected by microbial degradation and other geochemical processes occurring within the aquifer. Groundwater mixing fractions were determined by using dissolved Cl- and δ18O data, recognizing 3 end-member water types in the groundwater mixtures: (1) Withlacoochee River water (δ18O = -2.5 ± 0.3‰, Cl-= 12.2 ± 2 mg/l), (2) regional infiltration water (δ18O = -4.2 ± 0.1‰o Cl-=2.3±0.1 mg/l), and (3) regional paleowater resident in the Upper Floridan aquifer (δ18O = - 3.4 ± 0.1‰, Cl- = 2.6 ± 0.1 mg/l) (uncertainties are + lσ). Error simulation procedures were used to define uncertainties in mixing fractions. Fractions of river water in groundwater range from 0 to 72{\%} and average 10{\%}. The influence of river-water discharge on the quality of water in the Upper Floridan aquifer was traced from the sinkhole area on the Withlacoochee River 25 km SE in the direction of regional groundwater flow. Infiltration of water is most significant to the N and NW of Valdosta, but becomes negligible to the S and SE in the direction of general thickening of post-Eocene confining beds overlying the Upper Floridan aquifer.",
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