COMPARISON WITH MEASURLMENTS 



Table 4 compares data reported by Shaw (1977) and Berglund and Barney (1977) with 

 our calculated windspeed ratios U^/Uj^ from equation (20) using the values of f from 



table 2, 



Table 5 compares calculated values of U^/U^q_^j^ from equation (21) and table 2 



with data taken from Pons (1940), Raynor (1971), and Allen (1968). The agreement be- 

 tween model results and measurements is surprisingly good in all cases. 



Table 4. 



-Winds'peed ratio U 



o H 



Species : 



Stand descript 



ion : 



Data source 



: U 

 . ^ c 



: Calculated 



: from 



: published data 



Sitka spruce 



H = 34.5 ft, S.T. 



, dense 



Shaw 



(1977) 



0. 167 



0.16 



Scots pine 



H = 50.9 ft, S.T. 



, open 



Shaw 



(1977) 



0.259 



0.24 



Ponderosa pine 



H = 70 ft, S.I. 



, open 



Shaw 



(1977) 



0.297 



0.34 



Japanese larch 



H = 34.1 ft, S.I. 



, open 



Shaw 



(1977) 



0.359 



0.36 



Black spruce 



H = 11.5 ft, S.T. 



, open 



Berglund 





0.619 



0.63* 









Barney 



(1977) 







*p. 10, Table 2, 



ratio of slopes 



of regression equations 



relating windspeeds within 



and above the stand. 



Table S .--Windspeed ratio U /U^ 



Species 



Stand description 



Data source 



Calculated 



-"c/"20.H- 



from 

 publ ished 

 data 



Ponderosa pine 

 Red S white pi] 

 Japanese larch 



70 



ft, b.i., open hons uy4Uj 

 Red S white pine 34.5 ft, S.I., dense Raynor (1971) 

 34.1 ft, S.I., open Allen (1968) 



S. I 



0. 185 

 0.119 

 0. 180 



ave. 0.182 

 ave. 0.145 

 ave. 0.147 



10 



