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This paper shows the effects of building height variation on momentum and heat transfer characteristics using Comprehensive Outdoor Scale Model (COSMO) . Turbulent fluctuations and radiations were monitored on the two different type arrays at the same time to investigate the essential effects of building height heterogeneity; the normal model included an aligned array of only 15cm concrete cubes, and the variable model had a geometrically same array but with two building heights of 15cm±50% (i. e. 7.5cm and 22.5cm) . The uneven building array produced relatively strong mixing, and consequently the large drag coefficient. On the other hand, it showed a little difference in sensible heat transfer; there may exist a trade-off between the mixing intensity and the surface heating. The net radiations on the two sites were almost the same so that the building height variation was likely to have little influence on the heat balance as far as the current experimental condition is concerned.

OUTDOOR URBAN SCALE MODEL EXPERIMENTS ON THE EFFECTS OF BUILDING HEIGHT VARIATION ON THE ATMOSPHERE