3D CAD 対応熱環境シミュレータを用いた密集市街地の緑化による熱環境の緩和に関する研究

概要

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In this study, the cooling effect of urban greenery was analyzed, based on numerical simulation using a 3D CAD. Information regarding building form and materials was collected using geographic information system (GIS) data, aerial photographs and field investigations in a substantial urban area (26 ha) of Tokyo. A 3D CAD model was then developed, to which the material data was added. A method for the extraction of potential spaces for the introduction of greening was then developed, considering the live loads, legal conditions and daylight conditions for vegetation growth. A feasible greening plan was then constructed. The all surface temperature distribution was calculated for the present conditions, and a greening plan was proposed using the developed numerical simulation. After all considerations, it was revealed that the sensible heat flux, based on the proposed greening plan, would be decreased by nearly 10% to 30% per day from the present condition. In addition, it was determined that the most effective urban greenery locations were rooftops in detached house blocks, rooftop or ground areas in apartment blocks and rooftops or walls in commercial/business blocks.