Vindmátingar í Tórshavn 1974-78

Abstract

A discernible diurnal variation in the wind speed was detected from April to September with the highest speeds between 12 GMT and 24 GMT. The rest of the year the wind speed fluctuates around a rather constant level throughout the day.

From June to September there were also detected a discernible diurnal variation in the wind power with the highest values between 12 GMT and 21 GMT. The results for the rest of the year indicate a rather irregular diurnal variation in the wind power.
Considerable seasonal and interannual variation is found to be in both the wind speed and the wind power. The mean values of the wind speed and the energy pr. m2 in the wind for the period are 5.84 m/s and 2447 kWh/m2/year, respectively. West, southwest and south are found to be the most frequent directions of the wind. The highest mean velocities and mean energies are found to be in these directions.

The annual frequency distribution of the wind speed varies with the direction of the wind. A separate research (not discussed in this paper) has shown, that in each direction of the wind there are considerable interannual variation in the annual frequency distribution. When all directions are integrated, the resulting frequency distribution also shows an interannual variation.

It was investigated whether the Weibull distribution function could be used for modelling the frequency distribution of the wind. A goodness-of fit test shows that for the period, the hypothesis can be accepted on 0.1 % level of significance in northeast, east, southeast and southwest, and 2.5% level of significance in the north. The hypothesis must be rejectet by the goodness-of fit test when all directions are integrated.