Study on Differences of Temperature and Humidity and Vertical Distribution of Human Comfort between City and Countryside of Heilongjiang Province in Summer

摘要

[Objective]The research aimed to study differences of temperature and humidity and vertical distribution of human comfort between city and countryside of Heilongjiang in summer. [Method]By using temperature,humidity and wind velocity data at 10 and 70 m of two iron towers in urban and rural districts of Heilongjiang from June 1 to August 31,2010,the characteristics at temperature and humidity fields and change rule of human comfort index in urban and rural areas in summer were analyzed. [Result]Compared with rural areas,heat island effect of urban districts was obvious,and it was the strongest during 21:00-23:00 and the weakest during 05:00-06:00. Daily change rules of wind velocity at 10 m of two anemometer towers were basically consistent. Wind velocity was big at daytime and small at night. Daily change of wind velocity at 70 m of urban districts was consistent with that at 10 m,while wind velocity change at 70 m of rural areas was different from that at 10 m,which had obvious high-altitude wind characteristics. Daily change rules of humidity in two towers were basically consistent,and occurrence time of extremum at 70 m delayed for 1 h. At vertical height,humidity at 10 m was higher than that at 70 m at daytime,and was lower than that at 70 m at night. [Conclusion]The city had obvious wet island effect during 00:00-06:00 and dry island effect at nightfall. Comfort index of urban districts was higher than that in rural areas,and difference was the maximum during 19:00-21:00. Comfort index at 10 m was higher than that at 70 m at daytime in the city and countryside,and was lower than that at 70 m at night. Occurrence frequencies of Grade Zero of comfort at 10 and 70 m of urban districts were both over 60%,while occurrence frequency of ≥Grade Three of comfort was very small. At vertical height,human comfort had small difference at night.At daytime,as height rise,human comfort index significantly declined,and human feeling was more comfortable than that at low layer.