Zhuzhou City Block Summer Temperature Distribution And Street Characteristics

We studied the microclimate characteristics in the summer and the interrelationship among the climate elements in Zhuzhou city. The results showed that there was a temperature difference of 0. 1℃ between the eastern district and the western district in the city. The center of Yandi Square was the center of heat-island, with an average value of 2. 8癈. The results also showed that the temperature near the ground was the main factor influencing the evaporation. When the gap of evaporation rate was 0. 602g/ (cm2, hour), it led to a temperature gap of 0. 5癈 in average at 0. 5m above the concrete ground. It was not efficient to decrease temperature in the summer by means of water evaporation. It is more important to reduce temperature in the street in the summer by increasing plant cover. Normally, humidity had a strong influence on temperature in the street. However, when it was too high or too low, its influence became much weak.We analyzed also the relationship between temperature and the elements such as planting ratio, streets direction, and L/H. The result showed that:The temperature in W~E oriented streets was always higher than that in N-S oriented streets, with an average: 0. 6癈-0. 7℃. The difference would be higher when L/H value was lower, and the biggest difference reached to 1. 4℃ -1. 8℃. The high buildings by the streets could effectively reduce the absorption of solar energy within the streets.In a word, L/H value did not affect the absorption of solar energy in a W-E street. . When L/H value was too low, it would slow down the heat emission of a street, and keep the temperature higher and for a longer time, comparing with that of a high L/H-valued street. The increase of plant ratio would decrease effectively the temperature under this circumstance. It was utterly opposite while to an N~S oriented street.The results also provided some principled suggestion for the city construction and development in Zhuzhou.