Abstract
This report aims to propose a new aerodynamic parameterization of the urban land surface parameters for mesoscale weather prediction models. Aerodynamic parameters in build-up area are calculated from an output of the large eddy simulation in which the airflow within the building canopy was explicitly resolved with fine grid spacing. Real urban morphologies in Tokyo were implemented in the simulation. Drag coefficients, which were calculated from the numerical simulation, became significantly larger than those from the conventional morphological models widely used. The influence of relevant geometric parameters such as the maximum building height and the deviation of building height on the aerodynamic parameters are discussed. On the base of discussion above, a new simple aerodynamic parameterization is proposed.
