Abstract
The region below the roughness height is called a canopy. In this layer the wind characteristics are directly affected by roughness elements and the wind velocity profiles vary with the location. In this paper the spatially averaged mean wind speed profiles in the urban canopy were calculated numerically using the eddy viscosity hypothesis. The results of calculation were compared with the experimental data and a roughness parameter which was appeared in the model was evaluated. The roughness parameter includes the drag coefficient of roughness element and the friction velocity at the roughness height. The results shows that the roughness parameter depends on the roughness configuration. In case of cubic blocks arrayed in staggered patterns the relation between the roughness parameter and the roughness density was obtained.
