Abstract
This paper is intended to investigate the gustiness of wind concerning the greatest wind velocity in a given time interval at the eastern place of the City from the records of the Dines pressure tube installed at the Oosaka Meteorological Observatory at Katuyama, Higasinari-ku. From the observational data during two years the gustiness of wind, which is defined as the ratio of the velocity of turbulence to the mean wind velocity V, is given statistically by the following empirical formulae. G=0.575-0.65/V……SWerly Wind G=0.432+0.152/V…NEerly Wind Then the instantaneous greatest wind velocity W is given by W=2.0+1.65(V-2)…SWerly Wind W=2.0+1.40(V-1.6)…NEerly Wind These formulae will be useful for the estimation of wind pressure upon the building, etc caused by the violent storm. At this station the gustiness is usually observed to be greater in the case of SWerly wind coming over the City than NEerly wind flowing over from the flat field. In the tormer case the gustiness becomes to be about 0.43 having a tendency of decreasing according as the wind velocity increases, while in the later case it attains as 0.50 as the mean and increases with the wind velocity. This character is distinctly different from the results obtained by Mr. T. Harata, N. Kitahara, and others by using the data of the western part of this City.
