高架桥对城市街谷风环境的影响研究

Impact of Viaduct on the Wind Environment of Urban Street Valley

城市风环境是城市居住空间品质和居民生态质量的重要评价指标.研究表明,城市高架桥对周边既有建筑的室外风环境具有明显影响.以影响空气污染物扩散的无风区面积比例、影响室外活动区域舒适度的风速放大系数为指标,街谷高宽比、高架桥高度、跨线高差为变量,基于计算流体力学模型,模拟分析了高架桥跨线节点及街道沿线的风环境变化规律,为以环境控制为目标的高架桥建设提供了前期规划及设计依据.

In the paper,urban wind environment is an important evaluation index for the quality of urban living space and the ecological quality of residents.The study shows that the urban viaduct has a significant impact on the outdoor wind environment of surrounding and existing buildings.Based on the computational fluid dynamics model,the wind environment change rules of viaduct over-line joints and along streets are simulated and analyzed in this paper.The ratio from height to width of valley,the height of viaduct and the height difference between viaducts are as the variables.The proportion in windless areas of affecting the diffusion in air pollutants and the wind speed amplification factor of affecting the comfort in outdoor active areas are as the indicators.The work provides the prophase of planning and design basis for viaduct construction which is aimed at the environmental control.