都市における地表面温度差の物質拡散に及ぼす影響に関する実験的研究

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This paper describes the effects of the ground surface temperature difference on gaseous diffusion in built-up area by ndd experiments and by the wind tunnel investigations. In the field experiments, the black panels with high absorbance of solar radiation were used as the model of the ground surface to produce the fully developed thermal boundary layer. It has been confirmed from the field experiments as follows ; (1) the thermal boundary layer is sufficiently developed in small-scale experiments by using the panels ; (2) the turbulent intensity of the air flow on the panels becomes larger in propotion to the total solar radiation on a horizontal plane. In the wind tunnel investigations, the thermal boundary layer observed in the field experiments was simulated by using the hot panel with electrical heaters. The other thermal boundary layers generated by the difference of the surface temperature were studied by changing the arrangement of the Panels. For example, the cool surface zone in "parks and green belts" was also simulated by the cold panel with cold water. The tracer gas was emitted from the stack upwind of the hot panel in order to clarify the effects of the surface temperature difference on gaseous diffusion. It has been confirmed from the wind tunnel investigations as follows ; (3) in the case of setting only the hot panel in the wind tunnel, when the temperature difference between the oncoming air and the surface of the hot panel becomes larger, the maximum concentration on the floor decreases gradually ; (4) when the cold panel is set on the leeward of the hot panel, a large cooled air region is generated on the cold panel. As the result, the maximum concentration appears at higher position from the ground surface than in the case of setting only the hot panel.
東京工芸大学の論文

都市における地表面温度差の物質拡散に及ぼす影響に関する実験的研究

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