TScreen - ENV 6146, Atmospheric Dispersion Modeling A M...

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9/13/11 Table of Content 2 2 Part I Overview Limitations and Assumptions Release Type Model Selection Considerations for Time-Varying and Time-
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9/13/11 Overview 3 3 This model provides a logical approach to the selection of appropriate screening techniques for estimating ambient concentrations due to various toxic/hazardous pollutant releases . Screening estimates obtained using this model represent maximum short-term ground level concentration estimates from a meteorological perspective.
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9/13/11 Limitations and Assumptions 4 4 Screening techniques provided are intended for use on small to mid-scale non-accidental releases . All techniques assume that the toxic air contaminant is non-reactive and non-depositing . The determination of denser-than-air behavior is done based on the initial contaminant density comparison to ambient air.
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9/13/11 Limitations and Assumptions 5 5 Time dependent emissions cannot be simulated with these simple screening technique. Techniques provided assume steady releases for a specified period. All release calculations assume ideal conditions for gas and liquid flows. The influence of obstructions such as buildings and topography on denser-than- air releases and releases close to the ground are not included.
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9/13/11 6 6 Release Type Physical State Ø Gas (dense/highly reactive/rapidly deposits on surfaces) Ø Liquid Ø Aerosol Ø Multi-phased Process/Release Conditions
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9/13/11 7 7 Scenario Selection 1. Particulate matter (3) 2. Gases (11) 3. Liquids (9) 4. Releases from Superfund sites (1) Model Selection SCREEN RVD PUFF Britter-McQuaid How to select a model?
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9/13/11 Release Type 8 8
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9/13/11 Release Type 9 9
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9/13/11 Particulate Releases from Ducting/Connector Failures - 1.3 10 10 Instantaneous bursts of particulates due to duct failure (e.g., pneumatic conveyor line failures), line disconnection, isolation joint failure, or other types of equipment openings.
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Continuous Multiple Fugitive Emissions - 2.7 11 11 Releases from any continuous area or volume source. The emissions are uniformly released over the
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This note was uploaded on 09/11/2011 for the course ENV 6146 taught by Professor Staff during the Spring '11 term at University of Florida.

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TScreen - ENV 6146, Atmospheric Dispersion Modeling A M...

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