公園内の熱放射環境と幼児の行動から捉える熱中症の危険性

概要

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Recently, the increase of heat stress by the urban heat island or global warming is being pointed out. Increase of heat stress raises the danger of the heat stroke in daily life. Especially infants are strongly influenced by thermal radiation from the ground compared with adults and, therefore, infant's heatstroke risk could be considered very high. The purpose of this study was set to clarify the change in the Mean Radiant Temperature (MRT) with the passage of time from a viewpoint of infant by analyzing MRT at the height of 50cm and infant’s behavior. First, we gathered spatial geometry and material data in a park and constructed a 3D-CAD model, and calculated the spatial distribution of MRT. We also recorded the change in location of infant in the park. Then, we analyzed the change in the MRT with the passage of time from the viewpoint of infant. The results indicated that MRT for infants scored 38 degrees or more in bad condition and the condition continued 5 minutes or more. On the other hand, MRT for the parents scored the value from 33 to 35 degrees. The difference of MRT between for infant and for parent was 5 degrees at the maximum.