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DISPER software: Air pollution map produced by three different stacks (XZ-plane)
Canarina software for analysis of air pollution in environment: air pollution control, environmental engineering, environmental consultancy service, environment simulation, environmental modeling and environmental impact assessment. Air dispersion software: 56 atmospheric environment
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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The ISC models print a message and do not calculate concentrations for any source‑receptor combination where the source‑receptor separation is less than 1 meter, and also for distances less than 3 hb for a squat building or 3 hw for a tall building under building wake effects. It should be noted that, for certain combinations of stability and building height and/or width, the vertical and/or lateral plume dimensions indicated for a point source by the dispersion curves at a downwind distance of ten building heights or widths can exceed the values given by Equation (1‑37) or (1‑38) and by Equation (1‑42) or (1‑43). Consequently, the ISC models do not permit the virtual distances xy and xz to be less than zero.
1.1.5.3.2 Schulman and Scire refined
building downwash procedures.
The procedures for treating
building wake effects include the use of the Schulman and Scire downwash
method. The building wake procedures
only use the Schulman and Scire method when the physical stack height is less
than hb + 0.5 LB, where hb is the building
height and LB is the lesser of the building height or width. In regulatory applications, the maximum
projected width is used. The features of
the Schulman and Scire method are: (1) reduced plume rise due to initial plume
dilution, (2) enhanced vertical plume spread as a linear function of the
effective plume height, and (3) specification of building dimensions as a
function of wind direction. The reduced
plume rise equations were previously described in Section 1.1.4.11.
