第24回風工学シンポジウム

Presentation information

口頭講演

Wind environment (2)

Mon. Dec 5, 2016 2:50 PM - 4:02 PM AIJ Hall (AIJ)

司会:佐々木 澄(清水建設(株))

3:08 PM - 3:26 PM

[15] Measurement of Roughness Length in an Urban Area

○Tatsuki Hirano1, Hirofumi Sugawara2, Saya Araki1 (1.Graduate School of Science and Engineering, National Defense Academy of Japan., 2.Department of Earth and Ocean Sciences, National Defense Academy of Japan.)

Keywords:Roughness length, Urban canopy, Field observation

Roughness length was measured over the urban building canopy in Shibuya Tokyo. The study area includes low residential and highly built-up buildings. A sonic anemometer mounted in the tower at 52 m AGL measured turbulence, and the roughness length was determined by using the log profile equation and the measured wind speed. The measured roughness length agreed qualitatively with the land-cover type; 1.2 m for highly built-up area and 0.6 m for lower residential area. The parameterization for roughness length developed by Kanda et al. (2014, Boundary-Layer Meteorology) was validated with the measured results. Although some uncertainty remains for the footprint size, the parameterization agreed with the measurement.