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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
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
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?
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)
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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