Chemical Dispersion and Consequence Analysis (CD/CA) Workshop
Sunday, 9 March 2008, 12:30 - 5:30
This training course presents basic principles and subsequent
applications associated with the assessment of consequences resulting from
an accidental release of hazardous chemicals. The training begins
with presentations to introduce the participants to the fundamental elements
of CD/CA. These are:
1) source term characterization,
2) atmospheric transport and dispersion analysis, and
3) human health effects assessment.
The course material on source term characterization covers various gas and
liquid phase release mechanisms and addresses the complex phenomenology
that influences the variable non-linear rate at which the hazardous material
is released as a puff or plume to the environment. Basic principles
of two-phase flow and choked flow discharges, as well as liquid pool heat
transfer and evaporation, are among the topics to be discussed in conjunction
with characterizing the chemical source term.
The atmospheric transport and dispersion analysis element discusses the
complex interactions of the puff or plume of airborne hazardous material
with the atmosphere in the flow stabilization, near-field, and far-field
regions. Fundamental principles of atmospheric dispersion modeling,
including plume buoyancy, dense/heavy gas effects, deposition, effects of
temporal and spatial variations of the wind field, and application of meteorological
data are among the topics that are discussed.
The consequences segment focuses on the application of Emergency Response
Planning Guidelines (ERPGs) and its surrogate Temporary Emergency Exposure
Limits (TEELs), as indicators to establish inhalation exposure impacts of
individuals from environmental release of specific hazardous chemicals.
Trainers: Carl Mazzola
and Steve Vigeant
