熱環境の評価における樹木の夏季蒸散量に関する基礎的検討

概要

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In summer, trees are expected to ease the intense hot weather in urban areas. Numerical simulation by CFD is an available method for the estimation of the climatic mitigation effect of trees in urban planning. For improving the precision of numerical simulation, this study aims at acquiring basic knowledge about transpiration of a tree. This paper reports the results of actual survey in summer about zelkova serrata and prunus yedoensis. Conclusions gained by this research are as follows. 1) As a result of survey about prunus yedoensis and zelkova serrata that the leaf area density is about 1 m^2/m^3, when the global solar radiation is more than 2.0MJ/(m^2h) in summer, the approximate sap flow of prunus yedoensis is from 7 to 8cm/h and that of zelkova serrata is from 4 to 5cm/h respectively. 2) In summer, the mean percentage of released water of lawn to that of water surface is 79% approximately. Meanwhile, that of a tree per unit of area horizontally projected at the tree crown to that of water surface is about 26% for prunus yedoensis and 12% for zelkova serrata respectively. 3) The relationship between the leaf area density and the volume of transpiration per unit area horizontally projected at the tree crown of zelkova serrata is linear.
社団法人日本建築学会の論文
2006-03-30