Abstract:Along with the construction of small towns and the new round master plan being implemented, the construction of urban ventilation corridors and its eco-environment effect have gradually become a research hotspot. Taking Hangzhou as an example, the paper constructs a multilevel ventilation corridors system using a combination of urban climatic observation, multiscale numerical simulation and the controlling to urban form. The multisource evaluation indexes which could reflect and influence ventilated environment are established by synthetically considering, such as partitioned wind rose plot, the surface wind field, the wind functional areas and urban ventilated potential. The results indicate that, the spatial differences of urban dominant winds are significant and divided into 15 regions. The characteristic of surface wind fields is extracted via region boundary layer model coupling multi-layer urban canopy model, and it can be used to designate the primary urban ventilation corridors in Hangzhou. Meanwhile, the urban ventilated potential is evaluated for assisting in designating the secondary and three-level urban ventilation corridors, based on building coverage rate, upwind coefficient and surface roughness indexes. The effectiveness for improving the ventilation is proved by application of actual examples using the RNGκ-ε turbulent model. After all, the urban multilevel ventilation corridors system of Hangzhou consists of 6 primary ventilation corridors, 11 secondary ventilation corridors and 12 urban green corridors. It may provide guidance for similar research on other urban, thus serving urban ecological planning and management better.