Abstract : 3N.18
Averaging wind data for energy calculations in flat land and complex terrain

Haraldur Ólafsson, Sarah Poret
haraldur68@gmail.com
Bergen School of Meteorology, Geophysical Inst. University of Bergen and University of Iceland

Wind energy is calculated from surface wind observations using different ways of time-averaging. The energy remains similar if the wind speed is averaged over 6 to 30 days, but increases regularly as the time interval for averaging is decreased. For flat land, energy calculations based on 1 hourly observations give about 170% of the energy calculated from the monthly mean, while the corresponding proportion is 10% for 1h vs. 12h and 3% for 1h vs. 3h. For weather stations on flat land, this proportion remains quite similar, but for weather stations where mountain-induced winds are strong, the ratio of energy calculated from a long-term mean to energy calculated from 1 hourly observations can be quite different. This is associated with the wind speed distribution being different for locations where mountain-induced winds are frequent from what it is away from mountains.