Wildfire Risk Assessment: Western Travis County, Texas Integrating GIS and Fire Modeling Jennifer Perry CE 394K GIS.

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Presentation transcript:

Wildfire Risk Assessment: Western Travis County, Texas Integrating GIS and Fire Modeling Jennifer Perry CE 394K GIS

 Spatially and temporally simulate the spread and behavior of fires.  GIS based data input  Simulate weather, fuels, heterogeneous terrain  Simulate attack scenarios Fire Simulator

 Digital Elevation Model  Slope  Aspect  Fuels  Canopy Density Required GIS Raster Files.LCP file

 Digital Elevation Models Required GIS Raster Files  Downloaded from TNRIS – Digital Data site  USGS Mansfield Dam Quadrangle 30 meter resolution  UTM – NAD 27 projection

 Slope Required GIS Raster Files  Derived from DEM using ArcView Spatial Analyst  USGS Mansfield Dam Quadrangle 30 meter resolution  UTM – NAD 27 projection

 Aspect Required GIS Raster Files  Derived from DEM using ArcView Spatial Analyst  USGS Mansfield Dam Quadrangle 30 meter resolution  UTM – NAD 27 projection

 Fuels Required GIS Raster Files

 Fuels Required GIS Raster Files  USGS LULC vector file in digital degrees  Clipped against Mansfield Dam quad  Projected into UTM – NAD 27  Converted to grid based on DEM

 Canopy Cover Required GIS Raster Files  Interpolated from LULC grid  Expressed as percent density  Projected into UTM – NAD 27  Converted to grid based on DEM

 5-6 acre brush fire  September 4, 2000  Record high of F Field Site

Extent of Fire Lake Travis

FARSITE Simulation Chagoopa.LCP Ignition conditions: Elevation = 2208 m Slope = 29 0 Aspect = Fuel = 7 Southern Rough Chaparral (2-6 ft) Canopy Cover = m Closed Timber Litter Exposed Rock Southern Rough Chaparral Short grass 1ft

FARSITE Simulation Fire characteristics: Duration: 1 day T = 80 0 F, no wind Time step: 30 minutes Visible time step: 2 hours 500 m

What’s Left?  Compile Mansfield Dam raster files into.LCP file  Use FARSITE to convert Fuel Model from standard Anderson criteria to Fire Behavior Fuel Model  Run simulation based on Labor Day Fire  Overlay roads.shp and hydrants.shp to determine effectiveness of attack

Thanks to Brian Quinlan, Hudson Bend Fire Department, for access to GIS files