Environmental Engineering Reference
In-Depth Information
Figure 2.3
Wind speed measured 30 m above fl at terrain: vertical axis is wind speed, 0- 20 m/s.
(Reproduced with permission of Risø National Laboratory for Sustainable Energy)
VanDerHoven
5
4.5
VanDerHoven
4
3.5
4 days
3
Semi-diurnal
2.5
2
1.5
5 mins
1
1 min.
0.5
0
-3
-2
-1
0
1
2
3
Log (Base 10) of time scale, cycles per hour
Figure 2.4
Power spectrum of wind speed variation
