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SWATMOD-Prep: A Graphical User Interface for Preparing
Coupled SWAT-MODFLOW simulations
Ryan BaileyHendrick Rathjens
Katrin BiegerSeonggyu Park
Xiaolu Wei
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Motivation Facilitate Construction of SWAT-MODFLOW Simulations
Method Create a Graphical User Interface that automates the linkage between SWAT and MODFLOW
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Outline • Brief overview of SWAT-MODFLOW
• Development of SWATMOD-Prep
• Application to Little River Watershed, Georgia
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWAT-MODFLOWLinking Models:
MODFLOW
- Groundwater model- 3D finite difference
+
- More accurate groundwater flow dynamics
- Spatially-variable groundwater flow rates
- Spatially-variable groundwater discharge to streams
- Solute transport in aquifer system
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWAT-MODFLOWLinking Models:
Volatilization canal
PumpingWell
Vadose ZonePercolation, Stream stage
Solute transport
Root Zone Processes
Groundwater discharge Groundwater flow
Uptake
ET
Confining Layer
Plant Growth
Seepage
SWATMODFLOW
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWAT-MODFLOWLinking Procedure:
SWAT MODFLOW
HRUs Recharge Grid Cells
Groundwater Discharge
River Cells
Interactions Occur on Daily Basis (Default) or as specified by user
Sub-basins
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWAT-MODFLOW
HRUs Recharge Grid Cells
Groundwater Discharge
River Cells
1. HRUs Split into Disaggregated HRUs (DHRUs)
2. Intersect DHRUs with MODFLOW Grid
3. Intersect Sub-basins with River Cells “Linking” Text Files
SWAT Files + MODFLOW Files + Linking Files + SWAT_MODFLOW.exe
GIS Processing
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Outline • Brief overview of SWAT-MODFLOW
• Development of SWATMOD-Prep
• Application to Little River Watershed, Georgia
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWATMOD-PrepSWATMOD-Prep
Graphical User Interface (GUI) to create necessary linkage and input files for SWAT-MODFLOW simulations
Also an option to include RT3D (reactive nitrate transport in groundwater)
Created using Python, NumPy, and SciPy
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWATMOD-Prep
Path to SWAT model
Subbasin Shape fileHRU Shape fileRiver Shape file
Specify raster cell size (to convert shape files)Specify cell size for the MODFLOW gridDisaggregate HRUs
Intersect MODFLOW Grid with DHRUsIdentify River Cells in MODFLOW gridWrite linkage files!
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWATMOD-Prep
MODFLOW tab
• Aquifer thickness
• Hydraulic conductivity
• Storage parameters
• River bed material conductivity
• Initial Conditions
Options:
1. Use existing MODFLOW model
2. Create 1-layer MODFLOW model
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWATMOD-Prep
RT3D tab
• Porosity
• Dispersivity
• Denitrificaction
• Write RT3D input files
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWATMOD-Prep
Simulation tab
• Output file options
• Frequency of calls to MODFLOW
• Run Simulation
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWATMOD-PrepTUTORIAL
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Outline • Brief overview of SWAT-MODFLOW
• Development of SWATMOD-Prep
• Application to Little River Watershed, Georgia
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWAT-MODFLOWLittle River Watershed, Georgia
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
SWAT-MODFLOWLittle River Watershed, GeorgiaResults
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Development of
SWATMOD-Prep
SWATMOD-Prep
Overview of SWAT-
MODFLOW
Application to Little River Watershed
Summary
• SWATMOD-Prep: GUI to create SWAT-MODFLOW simulations
• Tutorial: How to use SWATMOD-Prep
• Will be available on the SWAT website by October 2016 (http://swat.tamu.edu/software/swat-modflow/)
• Or: contact Ryan Bailey ([email protected])
Funding