Transcript
  • 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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    2.5 - 3.5 mm

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    1.5 - 2 mm

    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

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    Water Use

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    Nutrient Compliance

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    BMP Adoption

    Social Value

    Water Use

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    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

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    High : 24.1606 m

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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)

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    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

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    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

    Slide Number 1


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