利用区域边界层模式对杭州市热岛的模拟研究

A Numerical Simulation on Hangzhou City Heat IslandUsing Regional Boundary Model

利用一个三维非静力区域边界层数值模式,对杭州地区城市热岛现象进行了数值模拟。数值模拟结果表明,杭州地区存在明显的城市热岛现象。夏季城市热岛现象较强,春秋季次之,冬季较弱。利用资源卫星遥感资料反演所得的地表温度,以及与地面气象站观测资料和数值模拟结果相比较,数值模拟结果和实测结果吻合得较好。在此基础上,模拟并探讨了人为热源、风速、地面粗糙度等因素对城市热岛强度的影响。

A 3-D nonhydrostatic regional boundary layer model is used to simulate the heat island phenomenon in Hangzhou. The simulated results show that the obvious heat island phenomenon exists in this area. The heat island is the strongest in summer, moderate in spring and autumn, and the weakest in winter. Comparing with the numerical simulation results and the observationdata of satellite at meteorological stations, showing that the numerical simulation results are in harmony with the observationdata. On the basis of those work, we continue to simulate and discuss the changes of heat island intensity caused by artificial heat source,aerodynamic roughness length and wind speed.