THE EXPERIENCE OF QUANTITATIVE ASSESSMENT OF RELIEF INFLUENCE ON THE URBAN BUILDING AERATION

Abstract

Buildings aerating features are one of important characteristics of urban environment. The CFD method (realized in the UrbaWind software) was used for quantitative assessment of relief (topographic) infl uence on the aeration of urban residential zones. The necessary stage of CFD-modeling is creating of geometrically correct image of real landscape. The model must include Earth surface, buildings and main groups of trees. Modeling need such input data as digital elevation model (DEM), digital buildings model and field anemometrical data (for verification of computer simulation results). Then these results analyzed by methods of mathematical statistics. The assessment of topography infl uence on the aeration of two residential areas was implemented: 1) for group of urban square with different number of storeys to north from historical center of Kursk including the part of Kur River’s valley; 2) for one urban square on leveled surface of Tuskar’ River’s fl oodplain. The infl uence of topography on the aeration of residential sites is possible to define by comparison of wind field characteristics by different directions for two conditions: ideal fl at topography and real topography. The comparison is convenient to realize by Pearson-correlation (R-coefficient) of pairs of mean speed values in the same points of model. On the whole, the minimal values of R are inherent to the more topographical dissected area (site №1). By some directions the minimal values of R are inherent 1) to general aspect of Earth surface on the site; 2) to aspect of the most sloped area – fragment of erosional scarp of Kur River valley in the shape of cirque. The morphology of Earth surface even in plain environment infl uences on the urban area aeration.