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10
10 m
25 m
40 m
50 m
9
8
7
6
5
4
0
2468 0 2 4 6 8 0 2
fiGurE 3.7
Annual average wind speed by time of day at 10, 25, 40, and 50 m heights, Dalhart, Texas, April
1996-2000.
locations will vastly underestimate the wind power potential for wind farms. The other formulas for
estimating wind speed with height are
H
z
H
z
ln
0
vv
=
(3.7)
ln
0
0
H
z
H
z
ln
1
+
0
vv
=
(3.8)
ln
1
+
0
0
50 m75 m
100 m
10
9
8
7
6
0246810
12
14
16
18
20
22
Hour
fiGurE 3.8
Annual average wind speed by time of day at 50, 75, and 100 m heights, Washburn, Texas,
September 2003-2006.
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