【摘要】 为探究湖泊等大型水体对内陆城市大气环境的影响,本文运用数值模拟的方法,引入KRB坐标变换,建立内陆城市热岛与湖风环流的模型,对比水箱实验验证数值模型的精确性,探究不同内陆城市湖泊面积和城-湖中心距大小对城市热岛影响,模拟结果表明:湖泊面积越大,近地面城市热岛羽流的偏移量越大,而当城-湖中心距增大的时候,近地面城市热岛羽流的偏移量则减小.在湖泊靠近城市时,湖风与城市气流协同作用产生较强的环流,对城市热岛羽流产生偏转作用;在湖泊远离城市时,湖风与城市上空气流发生对抗作用,并绕过城市热岛羽流顶部,与城市上空的分散流协同,在背风面产生增益效果.更多还原

【Abstract】 The impact of inland large water bodies on the air environment of inland cities was investigated based on the method of CFD(Computational Fluid Dynamics) simulation with KRB coordinate transformation. Both urban heat island circulation and lake wind circulation were modelled by the CFD methodology, and they were verified by comparing with the reduced-scale water tank experiment. The urban island circulation was heavily influenced by the size of the water body and its distance to the urban center. It was shown that the larger the lake area, the greater offset of the observed urban thermal plume; whereas, when the distance from the city center to the water bodies increased, the offset of the heat island plume near the ground reduced. When the lake was located close to the city, lake-breeze and the city airflow put aiding effect, i.e., generating strong aiding circulations. However, as the lake was further away from the city, opposing effect was found between the lake wind and the urban heat island circulation. Cooperating aiding effect could be found between the diverging flow and lake wind beyond of the plume.更多还原