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17 - Firestorms, Fallout, and Atmospheric Turbulence Induced by a Nuclear Detonation

from Part II - Challenges

Published online by Cambridge University Press:  31 January 2025

By
Jon Reisner ,
Eunmo Koo ,
Alexander Josephson  and
Alexander L. Brown
Edited by
Fernando F. Grinstein ,
Filipe S. Pereira  and
Massimo Germano
Fernando F. Grinstein
Affiliation:
Los Alamos National Laboratory
Filipe S. Pereira
Affiliation:
Los Alamos National Laboratory
Massimo Germano
Affiliation:
Duke University, North Carolina
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Summary

A nuclear detonation’s energy release can be approximately broken up into blast (50%), thermal (35%), and radiation (15%). If a detonation occurs significantly above ground (airburst) and various factors are favorable, for example, few clouds and no snow on the ground, then thermal radiation can ignite surface fires. These fires will first commence within fine fuels, such as paper and leaves on vegetation, but given time, these small-scale fires can upscale to larger fires that burn entire houses, trees, and possibly a city. Depending on weather conditions, the fires may continue to spread within a city and impact first responders or civilians sheltering in place to avoid fallout. This chapter highlights the coarse-graining of turbulence, combustion, and cloud physics associated with ignition, spread, and possible interaction of fires with nuclear fallout plumes. In particular, examples are given to illustrate the complex relationship between fallout and fires, an idealized detonation over Dallas (Texas, USA) and Hiroshima (Japan). For both examples, even though the nuclear airburst was at a fallout-free height of burst, the complex and turbulent interaction of the fires with clouds induced significant fallout on the ground.

Type
Chapter
Information
Coarse Graining Turbulence
Modeling and Data-Driven Approaches and their Applications
 , pp. 525 - 549
Publisher: Cambridge University Press
Print publication year: 2025

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