Numerical Modeling from Mesoscale to Urban Scale to Building Scale

摘要

For plumes originating in urban areas, the larger-scale transport may depend onthe near-source dispersal patterns within the city. In addition, the near-source dispersal behavior within the urban canopy may depend on the larger-scale flow features. In this paper, we will present preliminary meteorological and tracer dispersion simulations from a hierarchy of three prognostic models that were centered around Salt Lake City, Utah. The mesoscale COAMPS, the urban-scale HIGRAD, and the building-scale FEM3MP models were used to perform the simulations in a nested configuration. The multi-scale modeling approach allows us to explicitly capture mesoscale flow features over the large domain as well the effects of individual buildings in the smaller area of interest. At the conference, we will discuss an early morning and an afternoon simulation case and evaluate the effects of stability on transport and dispersion on the urban and building scales. We also will study whether or not the dispersion over the mesoscale is sensitive to what happens on the building scale.