Making of Thermal Environment Evaluation Map Based on Meteorological and Physiological Measurement

  • Reiko KOKUBO, 2013: Making of Thermal Environment Evaluation Map Based on Meteorological and Physiological Measurement .

Abstract

 To evaluate the thermal environment in the regional level, this study conducted the measurements of meteorological factors and physiological factors, and the questionnaire for human comfort in the city of Tajimi, Gifu prefecture. Furthermore, making a thermal environment evaluation map examined the effects of the countermeasures for thermal environment.
 Measurement results were compared with the land use and its surrounding environment using the thermal environment evaluation map. As a result, variations of meteorological and physiological factor were different for each observational location. It is considered that the difference of land use resulted in such results. Under the wet mist, for example, air temperature was low, while human comfort was uncomfortable. Under the dry mist, on the other hand, air temperature was low and human comfort was comfortable, while Wet-Bulb Globe Temperature (WBGT) was high. It became clear that air temperature, alone, cannot adequately represent the human comfort and the risk of human health. The human comfort and discomfort by thermal environment might depend on subjective and visual sense of human.
 In the target area of this study, there were few places with the low risk of the heat stroke. Results of the questionnaire for human comfort showed that the shade of a tree and the space under the dry mist were comfortable. In the target area, there were few outdoor environments to mitigate temporarily the risk of human health like heat stroke. Therefore, it could be suggested that the enlargement of more effective cool spot is necessary to mitigate the thermal environment in this city.
 In addition, the effect of countermeasures for thermal environment was evaluated using the thermal environment evaluation map. The space under the wet mist was relatively cool in terms of air temperature and human comfort, while WBGT showed more than severe caution level. On the other hand, the space in the shade of a tree was relatively cool in terms of air temperature, skin temperature, WBGT, and the human comfort was also comfortable. Hence, this study suggests that making shade of a tree is the most effective heat environment protection.
 Increasing shade of a tree is more effective to mitigate the thermal environment in terms of meteorological and physiological factors, human comfort.

Key words : climate-atlas, human health, WBGT, countermeasure for thermal environment, thermal and physiological measurement system