No-wind no-slope spread rate

n. The theoretical rate of spread predicted for a fire burning on flat ground with no wind.

 

  • Discussion

 

Rothermel's (1972) surface fire spread model predicts the no-wind no-slope spread rate and then adjusts that prediction to account for slope steepness  using the slope factor  and for mid-flame wind speed  using the wind coefficient.

 

  • Units

     

    Preferred units for rate of spread are m/min in technical reports and papers. Fire Management in the United States still uses the English units ch/hr. See the following units conversion table for conversion factors.

     

  • See Also

  • 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. 42 p.

     

  • Notes

    • Author 

      Joe Scott

      Systems for Environmental Management