U.S. Department of the Interior U.S. Geological Survey Nitrate and Groundwater Flow to Springs in the Upper Floridan aquifer, Lower ACF—Chipola Basin by.

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Presentation transcript:

U.S. Department of the Interior U.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 ) 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 percent decline per year of nitrogen input Maintain nitrogen input at 2001 levels

Study Area

Lower ACF Basin Elevation Streams Physiographic provinves

Floridan Aquifer System 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 IDSTATION NAME WELL DEPTHDODOCFENO 3 as NN15/N MALONE No <0.3< JAPSTER < BALTZELL SPRING GROUP --9.5<0.2< CITY OF COTTONDALE NO.3, HUTTON < SAND BAG SPRING --5.4<0.3< NWFWMD <0.4< NWFWMD <0.3< JACKSON BLUE SPRING --10.<0.3< Water Quality Results

AGE OF RECHARGE WATER AND PARTICLE TRACKING RESULTS

Preliminary Age Dating Results

pART Particle Age and Area Contributing Recharge to Springs

StatisticSandbagJacksonBaltzell Maximum Minimum Average Median Standard Deviation

NITRATE IN THE UPPER FLORIDAN AQUIFER AND SCENARIOS

Uncertainties of Fertilizer Data Locations of use? K Jackson County, Florida, 1945 to 2001 Nitrate-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 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.