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Application of the FEWS Stream Flow (SF) Model to the Limpopo Basin, Mozambique

Application of the FEWS Stream Flow (SF) Model to the Limpopo Basin, Mozambique. Final Report Tanya Hoogerwerf. OVERVIEW. Mid-Semester: Obtained the FEWS SF Model and text files, but no user information. Progress Report: Figured out what to do with .avx file and Hydro1k data.

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Application of the FEWS Stream Flow (SF) Model to the Limpopo Basin, Mozambique

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  1. Application of the FEWS Stream Flow (SF) Model to the Limpopo Basin, Mozambique Final Report Tanya Hoogerwerf

  2. OVERVIEW • Mid-Semester: Obtained the FEWS SF Model and text files, but no user information. • Progress Report: Figured out what to do with .avx file and Hydro1k data. • Final Report: Determined linkage between the GIS and rainfall-runoff simulation model; and successful at using 60% of model’s capabilities

  3. The FEWS Stream Flow Model • Spatially-lumped continuous soil moisture accounting model • Inputs (all grids) include Hydro1K, NOAA estimates of daily rainfall totals, USGS land use/land cover dataset, and FAO soils layer • Gulied A. Artan of the USGS provided this model and text files that result when the model is applied to the Limpopo basin in Mozambique

  4. Exploring the Components of the FEWS SF Model in ArcView • Fewsflood.avx added to EXT32 ArcView folder Route.exe added to the BIN32 ArcView folder • Text files supplied are organized by level 5 Pfafstetter codes • These included basin.txt, evap.txt, parameter.txt, rain.txt and response.txt • Run route.exe

  5. route.exe

  6. Data Collection- Hydro1K Hydro1K

  7. Additional Datasets Need Derived Soils Properties files!!

  8. Data Preparation • The required grids for the FEWS SF Model are a DEM, CN grid, Soil Water Holding Capacity Grid, Hydraulic Conductivity Grid, Soil Depth Grid, Texture Grid, Precipitation Grid, Evaporation Grid and Velocity Coefficient Grid • No information on model units, used text files instead (recycling data)

  9. Hydro1K Preparation (DEM) Match Hydro1K Pfafstetter Level 5 Basins

  10. Additional Grids • Text files imported into Excel • Saved as a .dbf files • In ArcView the fields were joined by Pfafstetter 5 digit codes • New field created • Shapefile converted to a grid

  11. GRIDS

  12. Running the FEWS SF Model !!!!! !!!!! !!!!!

  13. Complete Terrain Analysis • User supplies DEM • FEWS SF Model creates missing grids and shapefiles (Downstream Grid, Hill Slope Grid, Hill Length Grid, Basins Grid, basply.shp, Outlets Grid, StrLinks, Streams, FlowLen, FlowAcc, and FlowDir • Final threshold chosen to be 3,000 cells

  14. Generate Basin Characteristics File • INPUT: Basins Grid, Elevations (DEM), Flow Accumulation Grid, Hill Length Grid, Hill Slope Grid, CN Grid, Water Holding Capacity Grid, Soil Depth Grid, Hydraulic Conductivity Grid, Downstream Flow Length Grid, Stream Link Grid, Downstream Grid, and Max Impervious Grid • OUTPUT: basin.txt

  15. Generate Basin Response File • INPUT: Velocity Coefficient Grid, Basins Grid, Flow Direction Grid, Stream Outlet Grid • OUTPUT: response.txt

  16. Generate Rain/Evap Data Files • INPUT: Basin Grid, Rain Grid and Evaporation (as rain_19991 and evap_19991) • Can extract rain, evaporation or both • OUTPUT: rain.txt and evap.txt

  17. Perform Flow Routing • INPUT:

  18. Perform Flow Routing Continued • Utilizes route.exe and previously created txt files • Errors!!!

  19. Compute Rain/Evap Statistics • INPUT: • Select statistic to be computed

  20. Compute Rain/Evap Statistics Con’t • OUTPUT:

  21. Compute Flow Statistics and Display Flow Percentile Map • INPUT: ????? • Errors!!!

  22. Display Flooded Area Map • INPUT: Processed DEM, Stream Links Grid, Flow Accumulation Grid, flow depth (riverstage.txt), day • OUTPUT: Zone of Influence Grid and Flooded Area Grid

  23. CONCLUSIONS • Still a few small flaws in the model • With a simple set of instructions, could be easy to use • Wide range of applicability for large basins • Ready for a trip to MOZAMBIQUE! http://mozambique.gecp.virginia.edu/Floods/mozapic34.jpg

  24. SPECIAL THANKS • Gulied A. Artan • Jordan Furnans

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