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Water Quality Modeling in GIS

Water Quality Modeling in GIS. Application of Schematic Network Processing Schema Links and Nodes have unique behaviors based on their type A framework for unifying watershed, stream, and estuary models. Two Case Studies. Galveston Bay Bacteria Study

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Water Quality Modeling in GIS

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  1. Water Quality Modeling in GIS • Application of Schematic Network Processing • Schema Links and Nodes have unique behaviors based on their type • A framework for unifying watershed, stream, and estuary models

  2. Two Case Studies • Galveston Bay Bacteria Study • Application of Model Builder (Arc Toolbox 9.0) • Guadalupe River Nitrogen Study • Application of SPARROW for load estimation

  3. Galveston Bay

  4. Model Builder

  5. Rainfall to Runoff

  6. Rainfall to Runoff (1 of 2)

  7. Rainfall to Runoff (2 of 2)

  8. EMC Grid

  9. Load Grid

  10. Zonal Statistics

  11. Process the Schematic Network

  12. Results

  13. SPARROW • Regional-scale statistical water-quality model • Developed by USGS • Estimates load of pollutant for each sub watershed within a monitored basin using SAS • Has been applied to continental US, Mississippi Basin, and Northeastern US

  14. 414 National Stream Quality Accounting Network (NASQAN) Stream Monitoring Locations

  15. The Guadalupe River at Victoria Texas Basin Red represents along stream flow Green represents land to channel flow

  16. Schematic Network Processing Algorithm Upstream Load = 50 kg/yr Land Surface Load = 100 kg/yr Load = 50 x dchannel +100 x dsurface dchannel = decay due to travel along river channel transport dsurface= decay due to land surface to river channel transport

  17. Nitrogen Load Predictions

  18. Comparison with SPARROW Published Results

  19. Future Direction: Improve Data Resolution 1:500,000 1:24,000

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