MISKAM consists of a 3-dimensional
non hydrostatic flow model and an Eulerian dispersion model.
The physical basis are the complete 3-dimensional equations of motion of the flow field
and the advection-diffusion equation to determine the concentrations of substances with
neutral density. The calculated result is the stationary flow- and pressure-field,
diffusion coefficients and the concentration field in an area of typically 300 m x 300 m
(60 x 60 cells or more, non equidistant grid). The main application is in built-up
areas where neutral atmospheric stratifications are dominant. Input parameters
are: Information about the grid, the buildings, the aerodynamic roughness of the areas
between the buildings and on the building surfaces as well as position and strength of the
sources. Additionally, initial information about the wind direction, the wind speed and
the reference height of the wind speed is necessary.
WinMISKAM adds to the above mentioned MISKAM a
statistics module to determine statistical values of concentrations (annual mean
and 98-percentile), adds an NO-NO2-conversion model,
integrates everything in a user-friendly Windows-Surface which enables digitizing of the
buildings from a bitmap, handling of the non equidistant grid with the mouse, easy
gridding of the buildings, tools for the interactive preparation of the input files and
graphical features to control the input and output. Additionally needed input information
are long-term 3-dimensional statistics of the wind speed and the wind direction and the
distribution of the emissions in the course of the week. The calculated results are the
concentrations (annual mean values and 98-percentils) of the air pollutants under
consideration (incl. NOx and NO2).
WinMISKAM has an interface to PROKAS_V (program to determine
the concentrations by surrounding streets). The addition of the concentrations determined
by PROKAS_V and the concentrations determined by WinMISKAM is done time correlated with
the single values in order to assure a correct determination of the 98-percentile.
