A Case Study on Urban Ventilation Assessment with Local Climate Zone (LCZ) Parameters

The local climate zone (LCZ) partitions are widely used in urban climate investigations. Parameters characterizing LCZ types could be used in investigations about urban heat island (UHI) intensity and air ventilation modelling and assessment. In the current work, modelling methods of UHI intensity and wind environment are investigated based on the LCZ parameters. A drag source term with a porous media model of the urban canopy layer was proposed to simulate the urban scale wind environment with the CFD method. Vertical and horizontal airflow in the urban canopy layer was analysed. The upward and downward wind was found in the urban canopy model influenced by the variations of building height and density. On the other hand, the heat balance models could also be conducted on LCZ. Results showed the potential capabilities in urban wind assessment. A summary of models and the requirement on LCZ parameters were proposed.