西安市城市边界层热岛的数值模拟

本文使用非定常二维边界层大气动力和热力方程组数值模式,结合西安市1983年秋冬季城郊气象场的观测资料及能源耗量,分析计算了西安城市热岛热力场的特性和强度,并评估了由于城市能源消耗总量的增加对未来城市热岛的影响。

AMALYSES AND NUMEKRICAL STUDIES OF HEAT ISLAND OF XIAN CITY

In order to understand the characteristics of Boundarv layer climate of the city of Xian,a svnthetic field observation on the boundary layer and the soil layer was carried Out from Oct.to Nov,in the Xian region,and several usefuI turbulence and radiation data are obtained.A two-Dimensional dynamical and thermal numerical model used in PBL structure of the city,The turbulence colosure is based on the turbulent energy equation;the soil properties and radiative properties are also considered in the model.The simulating results from the model are suitable to illustrate the situation of the Xian heat lsland by using field data.The result of calculations shows the existance of urban heat island which is several degrees higher in temperature than adjacent rural regions.The result also compares the importance of different factors such as artifical heat release,soil properties and the surface roughness.The total amount of fuel consumed in the Xian industrial area and its increase rate in recent yearsvhave been carefully studied.The predicted tendency seems good in compared with teh climatic analyses, which indicates that the urban-rural temperature difference in the year of 2000 is about 0.6℃ morethan that of the mowadays.