"Numerical Study on the effect of building on temperature variation in urban and suburban areas in Tokyo "

Takayuki Tokairin^１, Hiroaki Kondo², Hiroshi Yoshikado², Yutaka Genchi², Tomohiko Ihara², Yukihiro Kikegawa³, Yujiro Hirano⁴, Kazutake ASAHI⁵

^１BUILDING RESEARCH INSTITUTE 
²National Institute of Advanced Industrial Science and Technology
³Meisei University
⁴Gunma University  
⁵Mizuho Information & Research Institute, Inc.

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN、Vol.84 No. 5 pp. 921- 937 (2006/10)

---

概要

A numerical investigation of the temperature variation in urban and suburban areas due to the presence of buildings was carried out using a one-dimensional canopy model combined with a meso-scale meteorological model. Since temperature increases in an urban area are caused by sensible heat from building surfaces besides anthropogenic heat and reduction of wind speed due to buildings’ drag,, we estimated each cause separately to determine the contribution by each to the temperature variation. The simulation was performed for Kanda, an urban area, and for Nerima, a suburban area of Tokyo. Comparisons were made with actual temperatures before the estimation. The simulation results indicated that, in a comparison with the temperature in no building environment, the contribution of (I) sensible heat flux from building surfaces to temperature rise was 49% in Kanda and 20% in Nerima, (II) wind reduction due to drag was 41% in Kanda and 59% in Nerima, and (III) the effect of the interaction between (I) and (II) was 10% in Kanda and 20% in Nerima.

キーワード

Urban heat island, Tokyo, daily maximum temperature, effects of buildigs on temperature 

---