nitrate and groundwater flow to springs in the upper floridan aquifer, lower acf—chipola basin
DESCRIPTION
Nitrate and Groundwater Flow to Springs in the Upper Floridan aquifer, Lower ACF—Chipola Basin. by Christy Crandall. Objectives of Study—2007 through 2009. 1) To quantify groundwater travel times areas contributing recharge hydrologic and geochemical processes occurring along flowpaths - PowerPoint PPT PresentationTRANSCRIPT
U.S. Department of the InteriorU.S. Geological Survey
Nitrate and Groundwater Flow to Springs in the Upper Floridan aquifer, Lower ACF
—Chipola Basin
by Christy Crandall
Objectives of Study—2007 through 20091) To quantify
• groundwater travel times
• areas contributing recharge
• hydrologic and geochemical processes occurring along flowpaths
2) Test 3 nitrogen management scenarios from 2002 through 2050 in areas contributing recharge to Jackson Blue, Baltzell Group, and Sandbag Springs.• Cessation of nitrogen input after 2001
• 4 percent decline per year of nitrogen input
• Maintain nitrogen input at 2001 levels
Study Area
Study Area
Lower ACF Basin
Elevation
Streams
Physiographic provinves
Floridan AquiferSystem
Named Springs
Mapped Closed-basin depressions
Confinement Status
Crack-in-the-woods Spring in the Chipola River Bed
Approximately 50 % of the Land Use is Agriculture
ACFB agricultural land use study -- trend data for nitrate
Regional Model
Sub-Models And Selected Groundwater sites
Results
STATION ID STATION NAME
WELL
DEPTH DO DOC FE NO3
as N N15/N14
305725085094102 MALONE No. 02115 6.6 <0.3 <6 6.43 3.46
305219085144901 JAPSTER00137 8.5 0.6 <6 6.39 3.85
304948085140501 BALTZELL SPRING GROUP -- 9.5 <0.2 <6 3.74 3.13
304746085223201 CITY OF COTTONDALE NO.3,128 3.0 0.6 30 0.99 7.36
304707085153301 HUTTON70 8.0 0.4 <6 0.37 7.62
304718085132000 SAND BAG SPRING -- 5.4 <0.3 <6 0.49 7.01
305137085060301 NWFWMD 8065 8.5 <0.4 <6 3.81 2.00
305025085082101 NWFWMD 8585 7.0 <0.3 <6 3.27 2.23
02358795 JACKSON BLUE SPRING -- 10. <0.3 <6 3.24 2.31
Water Quality Results
AGE OF RECHARGE WATER AND PARTICLE TRACKING
RESULTS
Table __. Summary of apparent ages (averages) from Piston Flow model.
CFC-11 CFC-12 CFC-113 SF6 %youngc113/c11 ratio
Jackson Blue Modern Contam. 21 16Hutton Contam. Contam. Contam. 17Sandbag 12 Contam. 22 19Cottondale 32 Contam. 25 30 24Baltzell Contam. Contam. Contam. 16Baxter 25 19 20 16 82 15Hwy69-VISA 23 18 20 14 65 19JAPST001 24 18 20 21 73 18Malone #2 Contam. 15 22 13
Preliminary Age Dating Results
pART
Particle Age and Area Contributing Recharge to Springs
StatisticSandbag Jackson Baltzell
Maximum 50.69 78.23 45.65
Minimum 7.91 0.01 0.12
Average 21.11 9.82 17.54
Median 20.44 8.49 14.05
Standard Deviation 10.66 6.46 11.49
NITRATE IN THE UPPER FLORIDAN AQUIFER AND
SCENARIOS
Uncertainties of Fertilizer Data
Locations of use?
K
Jackson County, Florida, 1945 to 2001
Nitr
ate-
N in
mg/
L
Estimated changes in nitrate concentrations in Jackson Blue, Baltzell Group, and Sandbag Spring from 2002 through 2050 with 3 different management scenarios
• Cessation of nitrogen input after 2001
• 4 percent decline per year of nitrogen input
• Maintain nitrogen input at 2001 levels
Estimated changes in nitrate concentrations in Jackson Blue Spring from 2002 through 2050 with 3 different management scenarios
Estimated changes in nitrate concentrations in Baltzell Spring Group from 2002 through 2050 with 3 different management scenarios
Estimated changes in nitrate concentrations in Sandbag Spring from 2002 through 2050 with 3 different management scenarios
Future of Study
Future Directions--Large Objectives
Develop linked groundwater/surface water model to calculate daily stage, stream flux, and head, as a function of pumpage, rainfall, upstream conditions, climate events, and dam releases through 2050
Future Directions—my tasks Convert Current Model to transient flow model
Use more sophisticated unsaturated flow and streamflow routing to account for aquifer- stream interaction, evaporation and recharge in the surficial aquifer/residium.
Calibrate transient model for 1978 to 2008 recharge, stream and spring flow and pumpage conditions.