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NLDAS -2
FARM SCALE DATA
REGIONAL WATERSHED MODELING OBJECTIVES
THE SANTA FE RIVER BASIN
HYDROLOGICAL MODELING APPROACH
SURFACE WATER MODELING: SOIL AND WATER ASSESSMENT TOOL (SWAT)
GROUNDWATER MODELING: MODFLOW
North Florida SouthEast Georgia (NFSEG) Groundwater Flow Model
PRELIMINARY RESULTS: COUPLING
FUTURE WORK
ACKNOWLEDGEMENTS
HYDROLOGICAL MODELING OF THE SANTA FE RIVER BASIN: TWO STAR-CROSSED MODELS
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1 - 1.5 mm2 meter Digital Elevation Model NLCD Land Cover SSURGO Soils
Jan 1999 Jan 2000 Jan 2001 Jan 2002 Jan 2003
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Figure 1: Location of the Santa Fe River basin and subsequent nutrient loading sources and concentrations for springs and rivers.
Figure 2: Stratigraphic framework for principal aquifers within the basin boundaries. Image courtesy FDEP -www.floridadep.gov
Figure 3: Depiction of karst landscapes and processes. Image courtesy www.waltonoutdoors.com
UnconfinedConfined
Couple a surface and groundwater flow model using the Soil and Water Assessment Tool (SWAT) and MODFLOW
The SWAT model enables us to
• Assess different weather/climate scenarios
• Evaluate alternative land use/water management practices
• Simulate surface water quality
• Quantify nutrient leaching to the aquifer
• Estimate changes in stream discharge over time
Figure 6: MODFLOW Grid showing river cells and discretization
Precipitation
Temperature
Relative Humidity
Solar Radiation
Wind Speed
FOREST SCALE DATA
Weather/Climate Scenarios
Management Practices
Land Cover Changes
The MODFLOW-RT3D model enables us to:
• Capture the heterogeneity of the geologic system• 7 layers• Highly variable permeability
• Simulate water and nitrate exchange between river and aquifer
• Predict groundwater levels and nitrate concentrations through time in different layers
• Surficial Aquifer • Intermediate Aquifer System• Floridan Aquifer System (FAS)
• Springs and rivers
• Developed by the St. Johns Water Management District (SJWMD) and Suwannee River Water Management District (SRWMD)
• Simulates regional groundwater flow for the extent of the FAS in order to assess the impacts of water resource management decisions (Pumping, MFL’s)
Clipping the NFSEG model
Figure 10: Particle tracking to establish groundwater flow boundaries into the Santa Fe River basin
Figure 11: Results of the groundwater flow boundaries which out SWAT model domain was clipped to match as well
Figure 9: Boundaries of the NFSEG (dark outline) and the location of our clipped model
Figure 7: Vertical layering of each of the 7 stratigraphic units
Figure 8: Groundwater levels from Floridan Aquifer System (layer 3)
Generates
Figure 4: SWAT-MODFLOW hydrological tasks. Image courtesy of www.floridanwater.org
Pro
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Water Use
Nutrient Leached
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Flow Compliance
Nutrient Compliance
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BMP Adoption
Social Value
Water Use
Nitrate Leached
Crop Yield
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Figure 12: SWAT-MODFLOW Framework in the context of the Santa Fe River Basin
Figure 15: Surface and groundwater exchange for select sites on the confined (A) and unconfined (B)
Figure 14: Observed and simulated (monthly) discharge at 02320700 gaging station.
Figure 13: Difference between average recharge for the year (2009) simulated in SWAT-MODFLOW and NFSEG
PHASE I
PHASE II
• Model has been coupled and data generated
• Continue calibration and validation of coupled model
Patricia Spellman1, David Kaplan1, and Wendy Graham21Environmental Engineering Sciences Department, Agricultural and Biological Engineering Department and UF Water Institute
Low : -1.94394
High : 24.1606 m
Low : -1.94394
High : 24.1606
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• Couple a surface and groundwater model to adequately represent the unique hydrology of the Santa Fe River basin (Phase I)
• To quantify how changing climate, land use and management practices impact water quality and quantity, and to assess tradeoffs among water quantity, quality, and economic sustainability (Phase II)
m
I would like to thank my colleagues, SagarithaRath and Rob de Rooj for additional insight andinformation on this work. I would also like tothank Ryan Bailey from Colorado State forunbounded generosity and help on the project.
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Figure 5: SWAT Model schematic showing inputs and sample outputs
Low : 0
High : 76
Nutrient contribution sources courtesy of Florida DEP BMAP Report. Estimates obtained via NSILT
USGS Gage: 2321500
USGS Gage: 2322500
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Image courtesy www.swat.tamu.edu
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https://en.wikipedia.org/wiki/Floridan_aquifer#/media/File:Generalized_cross_section_from_Marion_County,_Florida,_to_Collier_County,_Florida.pnghttps://en.wikipedia.org/wiki/Floridan_aquifer#/media/File:Generalized_cross_section_from_Marion_County,_Florida,_to_Collier_County,_Florida.png
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