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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 46 mm5
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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1.1.5.3 Procedures Used to
Account for the Effects of Building Wakes on Effluent
Dispersion.
The procedures used by the ISC
models to account for the effects of the aerodynamic wakes and eddies produced
by plant buildings and structures on plume dispersion originally followed the
suggestions of Huber (1977) and Snyder (1976).
Their suggestions are principally based on the results of wind‑tunnel
experiments using a model building with a crosswind dimension double that of
the building height. The atmospheric
turbulence simulated in the wind‑tunnel experiments was intermediate
between the turbulence intensity associated with the slightly unstable Pasquill
C category and the turbulence intensity associated with the neutral D
category. Thus, the data reported by
Huber and Snyder reflect a specific stability, building shape and building
orientation with respect to the mean wind direction. It follows that the ISC wake‑effects
evaluation procedures may not be strictly applicable to all situations. The ISC models also provide for the revised
treatment of building wake effects for certain
sources, which uses modified plume rise algorithms, following the suggestions
of Schulman and Hanna (1986). This
treatment is largely based on the work of Scire and Schulman (1980). When the stack height is less than the
building height plus half the lesser of the building height or width, the
methods of Schulman and Scire are followed.
Otherwise, the methods of Huber and Snyder are followed. In the ISC models, direction‑specific building
dimensions may be used with either the Huber‑Snyder or Schulman‑Scire
downwash algorithms.
