Document


Title

Role of buoyant flame dynamics in wildfire spread
Document Type: Journal Article
Author(s): Mark A. Finney; Jack D. Cohen; Jason M. Forthofer; Sara S. McAllister; Michael J. Gollner; Daniel J. Gorham; Kozo Saito; Nelson K. Akafuah; Brittany A. Adam; Justin D. English
Publication Year: 2015

Cataloging Information

Keyword(s):
  • buoyant instability
  • convection
  • convective heating
  • fine fuels
  • fire management
  • flame length
  • flame spread
  • forest management
  • fuel management
  • heat effects
  • radiation
  • rate of spread
  • wildfires
  • wildfires
Record Maintained By:
Record Last Modified: October 25, 2018
FRAMES Record Number: 54165
Tall Timbers Record Number: 31808
TTRS Location Status: Not in file
TTRS Call Number: Available
TTRS Abstract Status: Fair use, Okay, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

Large wildfires of increasing frequency and severity threaten local populations and natural resources and contribute carbon emissions into the earth-climate system. Although wildfires have been researched and modeled for decades, no verifiable physical theory of spread is available to form the basis for the precise predictions needed to manage fires more effectively and reduce their environmental, economic, ecological, and climate impacts. Here, we report new experiments conducted at multiple scales that appear to reveal how wildfire spread derives from the tight coupling between flame dynamics induced by buoyancy and fine-particle response to convection. Convective cooling of the fine-sized fuel particles in wildland vegetation is observed to efficiently offset heating by thermal radiation until convective heating by contact with flames and hot gasses occurs. The structure and intermittency of flames that ignite fuel particles were found to correlate with instabilities induced by the strong buoyancy of the flame zone itself. Discovery that ignition in wildfires is critically dependent on nonsteady flame convection governed by buoyant and inertial interaction advances both theory and the physical basis for practical modeling. Open access.

Online Link(s):
Citation:
Finney, M. A. et al. 2015. Role of buoyant flame dynamics in wildfire spread. Proceedings of the National Academy of Sciences of the United States of America, v. 112, no. 32, p. 9833-9838. 10.1073/pnas.1504498112. http://www.fs.fed.us/rm/pubs_journals/2015/rmrs_2015_finney_m001.pdf.