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Basin Analysis GIS - A Spatial Decision Support System for Hydrological Modeling

Basin Analysis GIS - A Spatial Decision Support System for Hydrological Modeling. Geoffrey Duh & Lesley Bross Geography, Portland State University AAG 108th Annual Conference February 25, 2012. New York, New York. Outlines. GIS and water forecast at NWCC Basin Analysis GIS

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Basin Analysis GIS - A Spatial Decision Support System for Hydrological Modeling

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  1. Basin Analysis GIS - A Spatial Decision Support System for Hydrological Modeling Geoffrey Duh & Lesley Bross Geography, Portland State University AAG 108th Annual Conference February 25, 2012. New York, New York

  2. Outlines • GIS and water forecast at NWCC • Basin Analysis GIS • Design & implementation of HRU Delineation module • Conclusions and future work

  3. USDA-NRCS National Water & Climate Center • Provides stream flow forecasts for over 740 points in the Western US. • Major tasks • Plan for snowpack monitoring stations • SNOTEL, snow courses • Model stream flow and make water forecast • Disseminate forecast reports

  4. Water Forecasting Components BAGIS BAGIS-H BAGIS-P PRMS

  5. USGS GIS Weasel

  6. BAGIS Development Goals • Compatibility • NWCC SW/HW environment • GIS Weasel • Integrity • Data management • Process • Efficiency • Computation • Workflow • Usability • Interface • Functionality

  7. Developing Environment • ArcGIS Versions 9 or later • ArcGIS Spatial Analyst extension • Microsoft Excel 2007 or later • ArcGIS 9 – ArcGIS Map Template (.mxt) VBA • ArcMap 10 – ArcGIS add-in (.esriAddIn) VB .NET

  8. Basin Analysis GIS BAGIS

  9. AOI (Watershed) Delineation

  10. AOI (Watershed) Delineation

  11. AOI Preview

  12. Maps & Tables Functions

  13. Table Output Examples

  14. Map Output Examples

  15. BAGIS-H: HRU Delineation BAGIS-H

  16. HRU Delineation • Hydrologic Response Unit - the smallest “hydrologically” homogeneous area in PRMS • Potential HRU delineation factors • Terrain features (e.g., flow contributing area) • Slope grades, aspect classes • Precipitation distribution • Landuse / land-cover classes • Soil drainage properties • Others

  17. Example HRU Zones Precipitation distribution (PRISM) and slope grade (NED DEM)

  18. HRU Delineation Primitive Processes • Terrain derivatives – contribution areas • User-defined regular zones • Reclassification of discrete values • Slicing of continuous values • Layer integration - combination (logical overlay) • Generalization – filtering and elimination • Splitting an AOI • Merging parts to form an AOI

  19. Terrain Derivatives – Contributing Areas (A, one zone; B, two zones; C, three zones) • Image source: Viger, R.J., and Leavesley, G.H., 2007, The GIS Weasel User's Manual: U.S. Geological Survey Techniques and Methods, book 6, chap. B4, 201 p; http://pubs.usgs.gov/tm/2007/06B04/

  20. User-defined regular zones: DAFlow-Type Zones • Image source: Viger, R.J., and Leavesley, G.H., 2007, The GIS Weasel User's Manual: U.S. Geological Survey Techniques and Methods, book 6, chap. B4, 201 p; http://pubs.usgs.gov/tm/2007/06B04/

  21. Reclassification of discrete values Output Input

  22. Slicing of continuous values Output Input

  23. Layer integration – combination (logical overlay) Output Input 2 Input 1

  24. Generalization – filtering and elimination

  25. Splitting an AOI 1 2 3 Input Split Layer (Zone 3 selected) Output

  26. Merging parts to form an AOI 1 2 3 Input 2 (Value 3 selected) Output Input 1

  27. BAGIS-H Key Features • Define HRUs • Refine HRUs • Data management • Process logging

  28. BAGIS-H Define Rule Dialog

  29. HRU Delineation – Template Rules • Templates combine 2 or more processes • Default templates provided but can be edited • Aspect example (reclassify + majority filter)

  30. Process logging All actions are recorded in an xml file

  31. Conclusions and Future Work • BAGIS increases NWCC data preparation efficiency by a factor of 10 • BAGIS-H facilitates research for finding best practices for HRU delineation • GIS is an important tool for the integration of sciences in water resources management • It’s hard to keep up with the ever-changing software development environment! • Future work • (BAGIS Ver. 1 was released in 2011) • BAGIS-H: to be released in March 2012 • BAGIS-P: AOI parameterization module, to be released in 2013

  32. Acknowledgements • The project was funded by USDA-NRCS National Water and Climate Center (USDA Agreement #: 68-7482-10-514) • Special thanks to: USDA-NRCS-NWCC Jim Marron, David Garen, Tom Perkins PSU Center for Spatial Analysis & Research (CSAR) Madeline Steele, Richa Jain, Heejun Chang

  33. For more information BAGIS website: http://www.geog.pdx.edu/CSAR/BAGIS/ E-mail: jduh@pdx.edu or lbross@pdx.edu

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