DEVELOPMENT OF A SOFTWARE TO DESCRIBE THE CITY MORPHOLOGY AND TO COMPUTE AERODYNAMIC PARAMETERS FROM AN URBAN DATA BASE

摘要

The Urban Boundary Layer (UBL) is structured by the heats fluxes and drag of the earth surface. The city represents a complex obstacle in the air flow. Consequently, a precise description of urban area is needed to calculate the aerodynamic parametersrepresenting the resistance offered by the urban structure to the flow.In this objective, the software DFMap is developed within a partnership of ECN, USTL and the society Siriatech. It allows to compute not only some statistical parameters describing the morphology of the buildings but also aerodynamic parameters like roughness length and displacement height, needed for micro-meteorological and air quality numerical simulations. This study is a contribution to UBL-ESCOMPTE project. A campaign of measurements was performed in the summer 2001, in Marseille (Fance), with objectives to carry out a three-dimensional data base of pollutant emissions and a study of the atmospheric composition and dynamics.This presentation of DFMap is followed by the first results of calculations and their validation.