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AGNPS and AnnAGNPS

AGNPS and AnnAGNPS. Developed by USDAARS and –NRCS Ag ricultural N on P oint S ource ( AGNPS ) single event model Ann ualized Ag ricultural N on P oint S ource ( AnnAGNPS ) continuous simulation model Available for download at: http://www.ars.usda.gov/Research/docs.htm?docid=5199.

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AGNPS and AnnAGNPS

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  1. AGNPS and AnnAGNPS • Developed by USDAARS and –NRCS Agricultural NonPoint Source (AGNPS) single event model Annualized Agricultural NonPoint Source (AnnAGNPS) continuous simulation model • Available for download at: http://www.ars.usda.gov/Research/docs.htm?docid=5199

  2. What is AGNPS? • Watershed-scale water quality model • Characteristics: • Spatially distributed • Continuous simulation • Surface runoff pollutant model • Source accounting

  3. AGNPS Framework • Watershed is divided into subwatersheds or cells (homogeneous drainage areas) • Cells are connected by streams/channels • One-dimensional channel routing • Route runoff and pollutants downstream • GIS interface used to: • Characterize watershed • Set model parameters

  4. AGNPS watershed

  5. AGNPS Components • Meteorology • Uses GEM (& others) to generate daily weather for specified years • Pollutant loading • Surface-runoff water (rainfall, snowmelt, & irrigation) • sediments by size (clay, silt, & sand) and source (land or stream channel) – RUSLE and HUSLE • nutrients (nitrogen, phosphorus, & organic carbon • source accounting

  6. AGNPS Components (cont’d) • Hydrology • Soil moisture balance • Runoff (SCS curves) • Evapotranspiration (Penman equation) • Lateral subsurface flow (Darcy’s eqn or tile drain flow) • Salmonid models

  7. AGNPS Applications • Assess BMPs • Develop TMDLs • Perform Risk Assessments • Estimate pollutant export

  8. Goodwin Creek, MS Study

  9. Goodwin Creek Study (cont’d)

  10. AQUATOX • Developed and distributed by USEPA • Available for download at: http://www.epa.gov/waterscience/models/aquatox/

  11. What is AQUATOX? • Simulation model that links environmental stressors and their impact on aquatic ecosystems • Characteristics: • predicts effects of multiple stressors (nutrients, organic toxicants, temperature, suspended sediment, flow) • Represents a variety of aquatic ecosystems

  12. AQUATOX Framework • Time-variable • Spatially simple • thermal stratification • salinity stratification • Modular and flexible • model only what is necessary • Control vs. perturbed simulations

  13. AQUATOX Conceptual Model

  14. AQUATOX Modules • Plants • Phytoplankton • Periphyton • Macrophytes • Moss • Animals • Zooplankton • Zoobenthos • Fish

  15. AQUATOX Modules (cont’d) • Inorganic sediments (stream only) • Scour, deposition and transport of sediments • River reach assumed short and well mixed • Feedback to biota (light limitation & sequestration of chemicals) • Nutrients and remineralization • Detritus • Nutrients • Variable pH • Dissolved oxygen and anoxia • Stratification

  16. AQUATOX Modules (cont’d) • Toxicant loading • Chemical fate • Biotransformation • Bioaccumulation • Chronic and acute toxicity

  17. AQUATOX Applications • Evaluate water quality criteria and standards, • Develop TMDLs • Identify cause(s) of biological impairment where there are multiple stressors • Perform ecological risk assessments

  18. Coralville, Iowa Study

  19. Coralville Study (cont’d)

  20. Coralville Study (cont’d)

  21. Coralville Study (cont’d)

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