RESULTS 



Predictions of the fire spread rate and intensity were obtained for slash at 

 and 2 mi/h (0 and 3.2 km/h) and for the grass -sagebrush mixture in the absence 

 of wind. Slope was for both examples and the wind was perpendicular to the ini- 

 tial line source. The important difference from other forms of the result is that 

 the predictions are presented as distributions. 



The rate of spread distribution was obtained from the distance traveled in 

 a specified time along each column of cells perpendicular to the initial fire 

 front (fig- 1) • Furthermore, the characteristic distance that the fire has 

 traveled through a cell--and thus the fraction consumed--can be calculated at a 

 given time (appendix II). Consequently, the accuracy of the overall distance 

 traveled is not limited to the cell size. 



The predicted intensity, Byram's fireline intensity, is presented as a distri- 

 bution made up of the intensities from each column of the array. 



SLASH 



The distributions of the rates of spread at windspeed and at a 2 mi/h wind- 

 speed and slope are given in figure 5. A prediction of the rate of spread assuming 

 a uniform fuel array having the average fuel parameters of the simulated array as 

 given in table 2 is presented also for comparison to the distribution. The average 

 spread rate of the uniform model lies 31 percent'^ below the nonuniform model (average 

 of the distribution) at a mi/h windspeed and 21 percent below at a windspeed of 

 2 mi/h. The overall range for both cases lies from 65 percent below to 76 percent 

 above the nonuniform model average. 



The nonuniform model average was used as the base for all percentage calcula- 

 tions . 



15 



