Roughness Effects
•
For well-mixed conditions (near neutral
lapse rate)
•
U
2
= u
1
ln (z
2
/z
o
)/ln(z
1
/z
0
)
•
Roughness length z
o
=.5 h A/S where h
height of obstacle, A- silhouette area, S
surface area A/S< .1
•
Z
o
- height where wind approaches 0