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A preliminary consideration on advantages of a puff model, such as CALPUFF, over plume models such as ISCST3 should be based
on the following modeling requirements:
- Whether the straight-line steady-state assumptions
on which a plume model is based are valid.
- Transport distances.
- Potential for temporally and/or spatially varying flow
fields due to influences of complex terrain.
- Non-uniform land use patterns.
- Coastal effects.
- Calm winds and stagnation conditions.
- Variable wind directions.
For cases involving a high degree of spatial variability
of the flow within the boundary layer, such as upslope or
downslope flows or flows along a winding river valley, the
straightline, steady state assumption may not be valid beyond
even a few kilometers, and a
puff model may be more appropriate.
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Puff models have a more realistic presentation of dispersion than
plume models. |
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Each of these programs has a graphical user interface (GUI). In addition to these components, there are several other processors
that may be used to prepare:
- Geophysical (land use and terrain) data in many standard
formats,
- Meteorological data (surface, upper air, precipitation,
and buoy data), and
- Interfaces to other models, like Penn State/NCAR Mesoscale
Model (MM5).
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| Other Advantages Include: |
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Complex Terrain |
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Stagnation, inversion, recirculation, and fumigation conditions. |
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Overwater transport |
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Coastal conditions |
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US EPA recommended model for Long Range Transport. |
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Near-fields impacts |
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Visibility assessments |
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Class I area impact studies |
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Criteria pollutants modeling |
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Implementation Plan (SIP) applications |
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Secondary pollutant formation and particulate matter modeling |
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Buoyant area and line sources |
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