FULL SCALE MEASUREMENTS OF WIND VELOCITY IN 2 URBAN AREAS USING AN ULTRASONIC ANEMOMETER

This paper describes the results obtained from the measurements of the characteristics of wind turbulence in urban areas through the use of ultrasonic anemometers. The data used in this paper is that which was gained from the year long observation extending from January 1990 through December 1990 and during two typhoons No.8922 and No.9011. The values of the turbulence intensity at a height of less than 100m were approximately 10%-15% larger than those recommended for corresponding urban areas by the AIJ standard, in which the specified power index of the wind profile is set at 0.3. The shape of the power spectral density for the u component agrees fairly well with the shape of the Karman type spectrum. The power spectral density of the v component is quite similar to the Karman type spectrum for the u component.