市街地空間における気温分布性状に関する実験的研究

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  • FIELD INVESTIGATION ON AIR TEMPERATURE DISTRIBUTION IN AN URBAN CAVITY SPACE
  • シガイチ クウカン ニ オケル キオン ブンプ セイジョウ ニ カンスル ジッ

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Air temperature distribution in an urban cavity of the rectangular type was investigated based on field measurement all daylong in hot summer. The cavity is enclosed with a street and both walls of buildings ; the center line of the street is oriented almost exactly east-west; the width of the street is 16 m ; the heigth of both buildings on the north side and the south side is 17 m. Air temperatures of 63 points in a section rectangular to the street and building's wall of the cavity were measured. A special method measuring air temperature outdoors was devised; which used fine thermocouple without shield, calibrated temperature error to solar radiation in advance, and corrected measured data in the sunny points on the calibration according to the direct solar radiation in the same time. The standard deviation of the air temperature distribution in the cavity was higher in the daytime than in the night time, was in the linear correlation to solar radiation, and held 0.5 K of maximum in the daytime. Mean of the air temperature in the cavity was occasionally changed, as the wind direction on the street was turned from west to east. The air temperature in the cavity was almost near to the outside air temperature. Temperature boundary layer on the surface was not over 50cm. Air vortex on the section in the cavity was observed from the air temperature distribution, when the wind direction was rectangular to the building's wall.

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