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 language | English (US) |
|---|---|
| Pages (from-to) | 995-1015 |
| Number of pages | 21 |
| Journal | Applied Geochemistry |
| Volume | 13 |
| Issue number | 8 |
| DOIs | |
| State | Published - Nov 1 1998 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - 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
AU - Plummer, L. N.
AU - Busenberg, E.
AU - McConnell, J. B.
AU - Drenkard, S.
AU - Schlosser, Peter
AU - Michel, R. L.
PY - 1998/11/1
Y1 - 1998/11/1
N2 - 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.
AB - 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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U2 - 10.1016/S0883-2927(98)00031-6
DO - 10.1016/S0883-2927(98)00031-6
M3 - Article
AN - SCOPUS:0032213585
VL - 13
SP - 995
EP - 1015
JO - Applied Geochemistry
JF - Applied Geochemistry
SN - 0883-2927
IS - 8
ER -