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Michael Brown
Los Alamos National Laboratory
Energy and Environmental Analysis Group
Drop Point 19S, SM-30, Bikini Atoll Road
Group D-4, MS F604
Los Alamos, NM 87545
Urban Dispersion Modeling in Cities
Abstract
The possibility of accidental releases of dangerous
chemicals from industrial facilities or terrorists attacks using chemical,
biological, or radiological (CBR) agents has led to renewed research on the
transport and dispersion of airborne contaminants in urban environments.
Our team is in the forefront of research on high fidelity city scale
transport and dispersion modeling, accounting for thousands of buildings in
our computational fluid dynamics/meteorological simulations. This code is
unique in that it includes meteorological physics as well as the large eddy
simulation (LES) turbulence scheme, the former being necessary for
city-scale problems and the latter allowing us to look at real time chaotic
behavior of plume transport. We have also developed a fast response code
that computes 3D wind fields and contaminant dispersion around building
complexes. This code, using empirical algorithms and mass conservation, can
provide answers in tens of seconds running on a laptop. In this presentation
I will provide a background on the impact of buildings on plume dispersion
and then discuss our high fidelity and our fast response urban transport and
dispersion models. I will also give information on wind tunnel,
reduced-scale outdoor, and full-scale outdoor urban experiments that we have
been involved in, and discuss a day-night population database that we have
created for the U.S. that is essential for estimating casualties for a toxic
agent release.
Biosketch
Michael Brown has worked at Los Alamos National Laboratory
on various air quality projects over the past ten years and has been the
team leader of the Urban Dispersion Modeling group for the past five years.
He received his Ph.D. and M.S. degrees from North Carolina State University
and his B.S. from the University of California at Davis.
Monday, December 1, 2003
Surge 284
10:10 a.m.-11:00 p.m.
(Refreshments will be served at 10:00 a.m.) |
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