54
temperature, humidity, or wind measurements. However, in the UCL the turbulent
activity created by flow around sharp-edged buildings is more severe than that
around natural obstacles, and it may persist for greater distances in their wake.
Again, the highly variable wind speed and direction encountered on the roof of a
building make rooftops sites to be avoided.
W
H
c
b
a
Fig. 2.9 Typical air flow in a street canyon (a) H/W ratio is 1/3 (b) H/W ratio around 1/2 (c) a
narrow street
G. Baranka et al.
temperature, humidity, or wind measurements. However, in the UCL the turbulent
activity created by flow around sharp-edged buildings is more severe than that
around natural obstacles, and it may persist for greater distances in their wake.
Again, the highly variable wind speed and direction encountered on the roof of a
building make rooftops sites to be avoided.
W
H
c
b
a
Fig. 2.9 Typical air flow in a street canyon (a) H/W ratio is 1/3 (b) H/W ratio around 1/2 (c) a
narrow street
G. Baranka et al.