Characteristic of wind direction in accordance with averaging times observed by an ultrasonic anemometer

Abstract

Characteristics of the nature wind based on wind observation have been carried out so far. Among them, wind speed frequency distribution and maximum instantaneous wind speed were focused on. On the other hand, few studies focused on wind direction characteristics compared with those studies. Authors set an ultrasonic anemometer on the roof of our university building and conducted wind observation. Therefore, in this study, we focused on wind direction observed by ultrasonic anemometer and investigated wind direction characteristics according to averaging times. As a result, although it is limited data of one month, it turned out that there is clear difference in the wind roses of the instantaneous wind direction and the 10 minute average wind direction.