【摘要】 采用通过卡尔斯鲁厄大学风洞实验数据验证的数值模型，研究绿墙（包含壁面绿化和屋顶绿化）在不同太阳辐射条件下对街道峡谷内污染物扩散的影响。结果表明，在背风面受热以及地面受热情况下，绿墙会削弱峡谷与外界的通风，并略微加剧峡谷底部污染物的堆积；在迎风面受热情况下，峡谷内出现多旋涡结构，通风削弱，污染物浓度大幅增加，而绿墙的蒸腾降温效应会略微抵消壁面受热带来的负面效果，降低峡谷底部的污染物浓度。更多还原

【Abstract】 A numerical model verified by the wind tunnel experiment data of KIT is used to study the impacts of wall greening, including green walls and green roofs, on the ventilation and the diffusion of pollutants within street canyons under different solar radiation conditions. The conclusion shows that when the leeward wall and the ground are both heated, the wall greening will weaken the ventilation between the canyon and the outside, and slightly increase the accumulation of pollutants at the bottom of the canyon. While the windward wall is heated, a multi-vortex structure appears in the canyon and the ventilation is weakened. The concentration of pollutants has increased significantly, and the transpiration and cooling effect of the green wall will slightly offset the negative effects of heating on the wall and reduce the concentration of pollutants at the bottom of the canyon.更多还原