A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A FIELD STUDY ON CLIMATE COMFORTABLE CONDITIONS OF URBAN PUBLIC OPEN SPACES IN MARGINAL SEASON OF WINTER CITIES
When the temperature is lower than 40 C, few users do outdoor activities; when it is higher than 40Q, on a sunny day with mild wind, the number of users doing outdoor activities increases gradually. [...]this study suggested that microclimate design in winter cities should focus on people's outdoor activities and improving the outdoor thermal comfort of public urban spaces in the marginal season rather than those in winter, which is the key to extending the outdoor season to be as long as possible (Pihlak, 1 994; Pressman, 1 996). The first stable five-day running average temperature value higher than 9Q in spring is the value from Apr 23rd to Apr 27th, and the first daily temperature higher than 9C among the five days is on Apr 25th, so it is taken as the initial date of the outdoor season. in the same way, the final date of the outdoor season in fall is calculated to be Oct 1st. [...]Apr 25th to Oct 1st is defined as the outdoor season, a duration of 160 days. in winter cities, climate conditions are very comfortable for outdoor activities in the period from late spring to early fall, during which people can reach the best comfortable state without clothing adjustment or active cooling or heating. in the meantime, the utilization ratio of public urban spaces is the highest during the entire year. According to the above analysis, the field survey results for the Harbin marginal season agree well with the calculated results based on the meteorological data from 1985 to 2014. The low roughness of the waterfront may limit wind velocity (Fu, 1987); this, together with the usual dry climate in the marginal season and the water climatic effects, contribute to the increase in wind velocity and the decrease in apparent temperature for local areas (Fu, 1994). [...]for winter cities, water use should be reasonably planned, such as reducing large areas of artificial water bodies and paying attention to the correlation between prevailing wind direction and waterfront in different seasons so that cool air can be brought into the public urban spaces in the summer and an adverse effect in the marginal season can be avoided.
A FIELD STUDY ON CLIMATE COMFORTABLE CONDITIONS OF URBAN PUBLIC OPEN SPACES IN MARGINAL SEASON OF WINTER CITIES
When the temperature is lower than 40 C, few users do outdoor activities; when it is higher than 40Q, on a sunny day with mild wind, the number of users doing outdoor activities increases gradually. [...]this study suggested that microclimate design in winter cities should focus on people's outdoor activities and improving the outdoor thermal comfort of public urban spaces in the marginal season rather than those in winter, which is the key to extending the outdoor season to be as long as possible (Pihlak, 1 994; Pressman, 1 996). The first stable five-day running average temperature value higher than 9Q in spring is the value from Apr 23rd to Apr 27th, and the first daily temperature higher than 9C among the five days is on Apr 25th, so it is taken as the initial date of the outdoor season. in the same way, the final date of the outdoor season in fall is calculated to be Oct 1st. [...]Apr 25th to Oct 1st is defined as the outdoor season, a duration of 160 days. in winter cities, climate conditions are very comfortable for outdoor activities in the period from late spring to early fall, during which people can reach the best comfortable state without clothing adjustment or active cooling or heating. in the meantime, the utilization ratio of public urban spaces is the highest during the entire year. According to the above analysis, the field survey results for the Harbin marginal season agree well with the calculated results based on the meteorological data from 1985 to 2014. The low roughness of the waterfront may limit wind velocity (Fu, 1987); this, together with the usual dry climate in the marginal season and the water climatic effects, contribute to the increase in wind velocity and the decrease in apparent temperature for local areas (Fu, 1994). [...]for winter cities, water use should be reasonably planned, such as reducing large areas of artificial water bodies and paying attention to the correlation between prevailing wind direction and waterfront in different seasons so that cool air can be brought into the public urban spaces in the summer and an adverse effect in the marginal season can be avoided.
A FIELD STUDY ON CLIMATE COMFORTABLE CONDITIONS OF URBAN PUBLIC OPEN SPACES IN MARGINAL SEASON OF WINTER CITIES
Wen Leng Hong (author) / Jiang Cun-Yan
2017
Article (Journal)
English
Cold , Microclimate , Weather , Climate change , Temperature , Wind , Field study , Architecture , Winter , Outdoor activities , Seasons , Urban planning , Research , Cities
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