STUDY ON EFFECT OF GREENING ON OUTDOOR THERMAL ENVIRONMENT USING THREE DIMENSIONAL PLANT CANOPY MODEL

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  • 樹木モデルを組み込んだ対流・放射・湿気輸送連成解析による樹木の屋外温熱環境緩和効果の検討
  • ジュモク モデル オ クミコンダ タイリュウ ホウシャ シッケ ユソウ レンセイ カイセキ ニ ヨル ジュモク ノ オクガイ オンネツ カンキョウ カンワ コウカ ノ ケントウ

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Abstract

In this study, velocity, temperature and humidity fields in urban area were analyzed using a new three dimensional plant canopy model developed by the authors. The model for the plant canopy developed here considers the following effects : (1) drag force of the planted trees, (2) shading effects on shortwave and longwave radiations, (3) production of latent heat from the plant canopy. Three cases were carried out here in order to evaluate the relaxation effect of plants on the outdoor thermal environment. In easel, green area ratio of ground surface was assumed 10%, while the green area ratio of ground surface was changed to 100% in case2. Furthermore plant canopies were set on the ground surface of case2 in case3. By comparing the distributions of scalar wind velocity, ground surface temperature, MRT (Mean Radiant Temperature) and SET (Standard Effective Temperature) in these three cases, effects of the plant canopy were clarified.

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