2011 Volume 7 Pages 93-96
The zero-plane displacement height d was evaluated in downtown Tokyo by the two independent methods of temperature variance and scintillometer heat flux. Regardless of the method, d exceeds the area-weighted average building height. This may be because d, which represents the point of effect for wind drag, is elevated by some tall buildings that jut above others. The area-weighted average building height would then be unsuitable as a geometrical index of urban canopies with large height variations. Thus, the height of the upper envelope of the canopy was proposed as the representative canyon height.
