街道峡谷地面源污染物扩散规律的风洞试验研究

A WINDTUNNEL INVESTIGATION ON DISPERSION OF SURFACE EMITTED POLLUTANTS IN A STREET CANYON

在风洞中１／２５０街道峡谷模型的底板内释放示踪气体，通过对浓度分布特征的观测，分析了街道峡谷地面源污染物的扩散过程及其与街道建筑物结构、风向及排放源强度等因素之间的关系，探讨了中性边界层风洞模拟微尺度湍流扩散过程的相似准则与相似参数，为建立街道峡谷地面源污染物扩散模型提供了物理基础。

A windtunnel investigation on dispersion of surface emitted pollutants ina urban street canyon is reported. The investigation concentrates on the mior-oscale factors, such as wind direction and architectural geometry, which haveinfluence on the dispersion process. The similarity criteria and the experimenttechniqus for simulating microscale turbulent dispersion in a bandary-layer-windtunnel are also discussed. This investigation provides a physical founda-tion for the dispersion model of urban street canyon.