市街地におけるキャノピー層内の風速分布に関する風洞実験

Abstract

The roughness elements of urban areas are large in size and densely distributed. Thismakes the wind characteristic of turbulent boundary layer over urban areas different fromthat over a flat plane or open country areas. In the region near ground I.e. the urbancanopy, in which the wind characteristic is directly affected by roughness elements, the windvelocity profie varies with the site and the distribution usually can not be shown by thelogrithmic law and the power law. A series of wind tunnel tests using staggered arrayedblocks was performed in order to investigate the wind characteristic of the urban canopy.The wind velocity was evaluated as the spatially averaged mean value. The variation wasexamined on the fetch, the free stream velocity, the condition of the inlet flow and thedensity of roughness.