关键词: 北京大学, 城市冠层模式, 不同下垫面, 温湿指数

Abstract: In the campus of Peking University, there are Weiming Lake, other water body, and agminate green space in the north part, differing significantly on the thermodynamic properties from the south teaching and living part which consist mainly of buildings and roads. In order to study the meteorological and comfort fields in summer, numerical simulation using the city canopy model of Peking University is carried out. In September it is more cool and comfortable in the north of the campus than in the south, and the temperature difference can reach 6. 7℃ at 15: 00. The temperature of road surface is higher than other surfaces because of the zero latent heat flux. The temperature difference can reach 10. 6℃ between road and water. The air specific humidity is higher in the north. The temperature distribution leads to a divergence air flow at 15:00. Thermohygrometric index (THI) is introduced to access human comfort, according to which 50% time of a day is at the “hot”level above road while above other surfaces only 20% of a day is at this level. This work can provide the scientific basis for assessing the meteorological effect of campus environment designs.

Key words: Peking University, city canopy model, different land use, thermohygrometricindex