Wind Tunnel Study on Wind Speeds near the Ground with Roughness Blocks

抄録

A wind tunnel experiment was carried out in a turbulent boundary layer wind tunnel to measure the vertical wind profile near the ground using a hot-wire anemometer. According to the Building Standard Law or AIJ Recommendation for Loads on Buildings, the wind speed near the ground surface at a height below Z_b is specified as a constant value. In the practical case, however, as the height approaches the ground surface, the wind speed decreases owing to the friction of the ground surface. In the present study, the focus was on the vertical wind profiles of the mean and maximum wind speeds and turbulence intensity near the ground with roughness blocks. The relationship between the mean and maximum wind speeds was investigated based on the results of the wind tunnel experiment. Finally, an equation that can estimate the maximum wind speed from the mean wind speed was proposed and compared with the equation proposed in a previous study.