Application of the FEWS Stream Flow (SF) Model to the Limpopo Basin, Mozambique
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Application of the FEWS Stream Flow (SF) Model to the Limpopo
Basin, Mozambique Final Report
Tanya Hoogerwerf
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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
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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
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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
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route.exe
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Data Collection- Hydro1K
Hydro1K
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Additional Datasets
Need Derived Soils Properties files!!
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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)
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Hydro1K Preparation (DEM)
Match Hydro1K Pfafstetter Level 5 Basins
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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
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GRIDS
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Running the FEWS SF Model
!!!!!
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!!!!!
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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
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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
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Generate Basin Response File
INPUT: Velocity Coefficient Grid, Basins Grid, Flow Direction Grid, Stream Outlet Grid
OUTPUT: response.txt
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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
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Perform Flow Routing
INPUT:
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Utilizes route.exe and previously created txt files Errors!!!
Perform Flow Routing Continued
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Compute Rain/Evap Statistics
INPUT:
Select statistic to be computed
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Compute Rain/Evap Statistics Con’t
OUTPUT:
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Compute Flow Statistics and Display Flow Percentile Map
INPUT: ?????
Errors!!!
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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
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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
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SPECIAL THANKS
Gulied A. Artan Jordan Furnans