APPLICABILITY OF RESULTS 



The numerical results derived in this report are subject to the restrictions listed 

 below. The reader is cautioned to be certain that the specified conditions prevail 

 when using these results. 



1. Flat terrain has been assumed throughout. If the terrain has substantial 

 slope or roughness, the windfield will reflect this fact, and substantial deviations 

 from these results ma\' occur. 



2. Adequate fetch to establish a uniform friction layer has been assumed. The 

 definition of "adequate" fetch is the subject of current research (Shaw 1977), so 

 numerical limits cannot be stated at this time. But near forest edges, lakeshores, 



or transitions in surface vegetation cover, the results given here may not be accurate. 



3. A "well-behaved" windfield is modeled by the relationships herein. If the 

 windfield is not steady, but fluctuates significantly in speed, direction, or both, 

 the friction layer will be continually in a transient state as it responds to the 

 forces at play. During the periods of such variability the results given here may not 

 be applicable. 



4. Any interaction between the fire and the windfield that substantially influ- 

 ences the speed or direction of the wind should invalidate these results. We have 

 dealt here with a windfield whose structure is dominated by the influence of the vegeta- 

 tion cover on the friction layer and any factor that disturbs this condition negates 

 the validity of the results given here. 



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