暴風時における風速の垂直成分について

Abstract

Three dimensional wind components at 1Gm from the ground in typhoon winds are studiedby the use of a propeller anemometer and the new all-weather type bivane, whose free periodis about 15/V sec and damping ratio is 0.15, at Shionomisaki Wind Observatory of Kyoto Univ.The data used in this study was odtained on Aug. 2~, 1963 when typhoon 6311 was passingover the southern ocean of Shionomisaki. The mean wind speed over the sampling duration(6 mm) was 18.3 in/sec. The vertical fluctuating components are smaller than longitudinal ones, and decrease more rapidly with averaging time than those. The ratio is about 20-'3l~%for a few seconds averaged wind speed, but it becomes nearly 10% for 20 or 30sec. Andthe correlation coefficient between longitudinal and vertical components is about 07.