How to diagnose fuel properties in WRF-SFIRE
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The fuel properties in WRF-Fire are given in file namelist.fire. These serve to create coefficients in the Rothermel's formula. To aid diagnostics it is useful to graph the resulting fire spread rate as a function of wind and slope. The graphs are available in metric units, as well as in English units for direct comparison with the published spread rate graphs for the Scott-Burgan fuel categories.
Prerequisites
Step-by-step instructions
- Run WRF-Fire, you can exit right after the start. There will be file fuels.m in the current directory.
- Start Matlab in the directory test/em_fire to set up the search path properly.
- In Matlab, Navigate to the directory with the fuels.m file
- Type fuels. This will create variable fuel. Say you want to check fuel 3. Type fuel(3) to see what is there.
- Type plot_fuel(fuel(3)) to create the graph below in metric units, and plot_fuel(fuel(3),'sb') for the same units as in Scott and Burgan (2005).
- Type edit fire_ros to see the fire spread rate calculation in Matlab.
- Type big(check_ros(fuel)) to make sure the calculation is the same as in WRF-Fire, it should return rounding error only (less than 1e-4)
Works with
- WRF-Fire 12 Sep 2010 and hopefully later
- Matlab R2010a
References
- Rothermel, R.C. 1972. A mathematical model for predicting fire spread in wildland fuels. Res. Pap. INT-115. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 40 pp. Media:Rothermel-1972-MMP.pdf
- Scott, J. H. and Burgan, R. E., 2005. Standard fire behavior fuel models: a comprehensive set for use with Rothermel's surface fire spread model.
Gen. Tech. Rep. RMRS-GTR-153. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station", 72 pp.", http://www.fs.fed.us/rm/pubs/rmrs_gtr153.html