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RESEARCH ARTICLE
Contents Vol 18(7)

Validation of FIRETEC wind-flows over a canopy and a fuel-break

François Pimont A D , Jean-Luc Dupuy A , Rodman R. Linn B and Sylvain Dupont C
+ Author Affiliations
- Author Affiliations

A INRA (Institut National pour la Recherche Agronomique), Unité de Recherches Forestières Méditerranéennes, Equipe de Prévention des Incendies de Forêt, UR629, F-84914, Avignon, France.

B Earth and Environmental Sciences Division, Los Alamos National Laboratory Los Alamos, NM, 87544, USA.

C INRA, UR1263 EPHYSE, 71 Avenue Edouard Bourlaux, F-33883, Villenave d’Ornon, France.

D Corresponding author. Email: pimont@avignon.inra.fr

International Journal of Wildland Fire 18(7) 775-790 https://doi.org/10.1071/WF07130
Submitted: 7 September 2007  Accepted: 22 December 2008   Published: 27 October 2009

Abstract

The wildfire model FIRETEC simulates the large coherent eddies of the wind-flows induced by the canopy. It has been qualitatively validated in its ability to simulate fire behavior, but there is still a need to validate physical submodels separately. In the present study, the dynamics and turbulence of the flow simulated by FIRETEC are validated in a manner similar to other air-flow models without fire, through comparison with measurements associated with flows within continuous and discontinuous forests captured through in situ and wind-tunnel experiments with neutral thermal stratification. The model is shown to be able to reproduce accurately all essential features of turbulent flow over both forests. Moreover, a short sensitivity study shows that the model is not very sensitive to uncertain parameters such as vegetation drag coefficient. Finally, it is shown in the discontinuous forest case that wind gusts on fuel-breaks can be very strong and significantly higher than in surrounding canopies, even if their directions are more stable. These results and others briefly reviewed in the present paper allow better understanding of wind-flow perturbations induced by fuel-breaks. This new validation added to previous ones confirms the ability of FIRETEC for investigating effects of fuel-break design on fire propagation.

Additional keywords: forest canopy, forest edge, HIGRAD, large-eddy simulation, wildfire.


Acknowledgements

This study has been partially funded by the European Commission in the frame of the FIREPARADOX research program (contract FP6–018505) and the large computations for this work have been made possible by the Los Alamos National Laboratory Institutional Computing resources.


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