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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: ISC 94 velocity
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DISPER: Air pollution dispersion · DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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3.The user specifies the average
height of emissions from the floor of the pit (H) and the pit volume (V). The effective pit depth (de) and
the relative pit depth (Dr) are then calculated as follows:
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4.Based on observations and
measurements in a wind tunnel study (Perry, et al., 1994), it is clear that the
emissions within the pit are not uniformly released from the pit opening. Rather, the emissions show a tendency to be
emitted primarily from an upwind sub-area of the pit opening. Therefore an effective area source (with Ae
being the fractional size relative to the entire pit opening) is used to
simulate the pit emissions. Ae
represents a single area source whose dimensions and location depend on the
effective depth of the pit and the wind direction. Based on wind tunnel results, if Dr³0.2,
then the effective area is about 8% of the total opening of the mine (i.e. Ae=0.08). If Dr<0.2, then the fractional
area increases as follows:
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When Dr
= 0, which means that the height of emissions above the floor equals the
effective depth of the pit, the effective area is equal to the total area of
the mine opening (i.e. Ae=1.0).
