最大瞬間風速と突風率の測定について

Abstract

The typhoon 9119 has left the new largest peak gust speed records at many stations compared to the largest wind speed records.Some researchers pointed out special feature of large turbulence of this typhoon.However, it is necessary to consider recent changes of characteristics of anemometers.In this paper, the response of the propeller anemometer is studied using the observed data at Tsuruga test power-line.Propeller anemometers can not respond to wind fluctuations with short duration (less than around 1 sec). Recent improvement of the dynamic response of the anemometer has resulted in larger peak gust speed.If large deviations from the wind direction happens from overshooting of wind vane of the propeller anemometer, the averaged wind speed by the propeller anemometer may be underestimated.As the result, apparent larger gust factor may be obtamed.