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Nitrate Impact on Aquifer Springs: Management Scenarios and Future Directions

This study from 2007 to 2009 aimed to understand groundwater flow to springs in the Upper Floridan aquifer and Lower ACF—Chipola Basin. Objectives include quantifying groundwater travel times, mapping areas contributing to recharge, and analyzing hydrologic and geochemical processes. The study tested three nitrogen management scenarios from 2002 to 2050 for springs like Jackson Blue, Baltzell Group, and Sandbag Springs. The research focused on nitrate levels and potential impacts on water quality. Future directions involve developing a linked groundwater/surface water model and enhancing the transient flow model to account for aquifer-stream interaction, evaporation, and recharge dynamics. The ultimate goal is to improve understanding of the aquifer system and its response to various management strategies.

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Nitrate Impact on Aquifer Springs: Management Scenarios and Future Directions

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  1. Nitrate and Groundwater Flow to Springs in the Upper Floridan aquifer, Lower ACF—Chipola Basin by Christy Crandall

  2. Objectives of Study—2007 through 2009 1) 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

  3. Study Area

  4. Study Area Lower ACF Basin Elevation Streams Physiographic provinves

  5. Floridan Aquifer System Named Springs Mapped Closed-basin depressions Confinement Status

  6. Crack-in-the-woods Spring in the Chipola River Bed

  7. Approximately 50 % of the Land Use is Agriculture

  8. ACFB agricultural land use study -- trend data for nitrate

  9. Regional Model

  10. Sub-Models And Selected Groundwater sites

  11. Results

  12. Water Quality Results

  13. Age Of Recharge Water and particle tracking results

  14. Preliminary Age Dating Results

  15. pART Particle Age and Area Contributing Recharge to Springs

  16. Nitrate in the Upper Floridan Aquifer and Scenarios

  17. K Uncertainties of Fertilizer Data Locations of use? Nitrate-N in mg/L Jackson County, Florida, 1945 to 2001

  18. 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

  19. Estimated changes in nitrate concentrations in Jackson Blue Spring from 2002 through 2050 with 3 different management scenarios

  20. Estimated changes in nitrate concentrations in Baltzell Spring Group from 2002 through 2050 with 3 different management scenarios

  21. Estimated changes in nitrate concentrations in Sandbag Spring from 2002 through 2050 with 3 different management scenarios

  22. Future of Study

  23. 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

  24. 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.

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