| Popis: |
In the wind-resistant design of buildings and structures, it is very important to accurately assess the design wind speed at a particular site, considering the variation in wind speed with terrain roughness. In this study, the authors’ group attempts to find a reasonable method for estimating design wind speed for a given terrain roughness, through simultaneous wind observations at altitudes up to 420 m over two sites with different roughnesses using Doppler sodars. Prior to the observations, preliminary measurements were conducted to determine the effect of measurement conditions such as the transmission method, pulse length, power and frequency, on both the data collectable rate and the measured values. The quality of the data obtained under various measuring conditions was studied, and then a proper measuring condition was determined. Then, simultaneous observations of atmospheric boundary layer wind speeds were conducted by Doppler sodars at a “seaside” area and a “suburban” area. The characteristics of the mean wind speed profiles, which were evaluated for each distinguished wind speed level in each wind direction, are presented. The longitudinal mean wind speed profiles in the same storms at the two sites were also compared to study the variation in longitudinal mean wind speed as this is affected by inland terrain roughness |
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