Wind tunnel experiments of parameters scheme of non-uniformity buildings

To more precisely describe the effects of non-uniform buildings on atmospheric dynamics in parametric numerical models, this paper set up a morphological parameterization method to represent the non-uniformity of buildings according to the geometric morphology of buildings, including the frontal area index (λ_f), the plan area index (λ_p), the shape index (S_BC), and the integrated non-linear coefficient (R). Wind tunnel experiments were carried out to study the effect of buildings morphologic parameters on drag force. A floating experimental platform was designed to measure the drag force of the whole area. Results show that, different roughness of surrounding landforms has little effect on the drag coefficient, the frontal area index is the main factor of wind direction on the drag coefficient. The drag coefficient increases with the increasing of frontal area index, density index, shape index and the decreasing of integrated non-linear coefficient, respectively.