Improved Assessment of Nitrogen and Phosphorus Fate and Transport for Irrigated Agricultural Watersheds in Semi-Arid Regions
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Improved Assessment of Nitrogen and Phosphorus Fate and Transport for Irrigated Agricultural Watersheds in Semi-Arid Regions
- 1. Improved Assessment of Nitrogen and Phosphorus Fate and Transport for Irrigated Agricultural Watersheds in Semi-Arid Regions (2013-2017) Project Director: Mazdak Arabi Co-PD: Ryan T. Bailey Co-PD: Tim Gates PhD Student: Xiaolu Wei PhD Student: Seonggyu Park Dept. of Civil and Environmental Engineering Colorado State University 1
- 2. Project Overview Nitrogen and Phosphorus Transport in Semi-Arid Regions 1. Enhance the capacity of the SWAT model to simulate N and P transport in semi-arid irrigated agricultural watersheds 2. Improve understanding of the processes that govern N and P movement, transformation, and storage in irrigated agricultural watersheds 3. Assess viable remediation strategies for N and P contamination 4. Disseminate the new modeling tool to the research community
- 3. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 1. Improve SWAT Model 3 Linking 3 Models: SWAT MODFLOW RT3D Land Surface Processes Stream Processes Groundwater Flow GW-SW Interactions Chemical Transport Mass Loading to SW + +
- 4. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 1. Improve SWAT Model 4 Linking 3 Models: SWAT MODFLOW RT3D Volatilization canal Pumping Well Vadose Zone Percolation, N, P Concentration Stream stage Solute transport Root Zone Processes Groundwater discharge Groundwater flow Uptake ET Confining Layer Plant Growth N, P mass loading N, P reactive transport Transport
- 5. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 1. Improve SWAT Model 5 SWAT MODFLOW / RT3D HRUs Grid Cells Recharge / NO3, P Channels Stream Stage River Cells GW Discharge NO3, P conc. NO3, P Loading • HRU-Grid Linkage: GIS Pre-processing routines • SWAT-MODFLOW-RT3D: single FORTRAN code • Daily time step
- 6. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Model Applied to 3 Watersheds Sprague River Oregon 4,100 km2 Arkansas River Colorado 500 km2 470 km2 Middle Bosque River Texas
- 7. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes MODFLOW Model (USGS) Sprague Watershed SWAT-MODFLOW-RT3D - 1970-2004 - Water table elevation - Stream discharge - NO3 concentration - In-stream NO3 loading
- 8. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Annual Average Recharge
- 9. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Average Groundwater NO3 Concentration
- 10. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Groundwater Discharge to Streams
- 11. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Average Annual NO3-N Loading to Streams
- 13. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Arkansas River, Colorado • Designate each cultivated field as an HRU • Incorporate canal seepage • Include N and P concentration in irrigation water • Assess N and P storage in soil, groundwater, riparian areas • Investigate influence of climate (e.g. drought)
- 14. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Field Data Collection • 22 Groundwater monitoring wells • 8 surface water sites
- 15. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Field Data Collection • 22 Groundwater monitoring wells • 8 surface water sites
- 16. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Arkansas River, Colorado What are the timing and amount of N and P loading at various locations along the main river and its tributaries? What influence do spatially-variable aquifer properties and irrigation practices have on flow paths of N and P mass and subsequent timing of N and P loading to surface water bodies? What is the overall influence of irrigation chemistry on N and P mass in groundwater and surface water?
- 17. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Arkansas River, Colorado Each field is an HRU
- 18. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes Arkansas River, Colorado
- 19. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 2. Understand Processes MODFLOW-RT3D Model Results
- 20. Improve SWAT Model Disseminate Tool 3. Assess Viable BMPs Arkansas River, Colorado BMPs to Analyze: • Fertilizer reduction (uniform and targeted) • Increased irrigation efficiency • Canal sealing • Rotational fallowing • Riparian enhancement Assess BMPs Understand Processes (15-30%) (10-20%) (0-20%) (15-25%) (5-10%)
- 21. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 21 1.Conference Presentations 2.Workshops & Tutorials 3.Tools (User Interface) 4.Website
- 22. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 22 1. Conference Presentations 2. Workshops & Tutorials 3. Tools 4. Website • SWAT Conference (2015) Purdue • AGU Hydrology Days (2015, 2016) CSU • SWAT Conference (2016) Beijing • AWRA Conference (November 2017)
- 23. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 23 1. Conference Presentations 2. Workshops & Tutorials 3. Tools 4. Website • SWAT Conference (2015) Purdue • AGU Hydrology Days (2015, 2016) CSU • SWAT Conference (2016) Beijing • AWRA Conference (November 2017)
- 24. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 24 1. Conference Presentations 2. Workshops & Tutorials 3. Tools 4. Website SWATMOD-Prep Graphical User Interface
- 25. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 25 1. Conference Presentations 2. Workshops & Tutorials 3. Tools 4. Website
- 26. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 26 1. Conference Presentations 2. Workshops & Tutorials 3. Tools 4. Website SWAT-MODFLOW Google Group 127 Members (since 2015)
- 27. Assess BMPs Improve SWAT Model Understand Processes Disseminate Tool 4. Disseminate Modeling Tool 27 Current Collaborations with SWAT-MODFLOW-RT3D • Ogallala Aquifer Region (CSU, Texas Tech Univ., Univ. of Nebraska) • South Platte River Basin (CSU) • Little River Watershed, Georgia (CSU, USDA-ARS) • Western Alberta, Canada (University of Alberta) • Dee River Watershed, Wales, United Kingdom (Swansea University) • Central Germany (University of Kassel) • Tigris-Euphrates River Basin (Clemson University) • Limpopo River Basin, Botswana (South Dakota State University) • Australia (Flinders University) • Buenos Aires, Argentina (Plains Hydrology Institute)
- 28. 28 Summary 1. New Modeling Tool (SWAT-MODFLOW-RT3D) (Oct. 2015) • GW level, GW flow, soil water, stream discharge • Nutrient concentration in GW and stream water • Nutrient mass loading between aquifer and streams • Nutrient mass storage in soils and aquifer 2. Application of Model to 3 Watersheds (OR, CO, TX) 3. Next 2 years: more results for CO and TX watersheds 4. Model being used by research groups worldwide