Assessing the effect of a fuel break network to reduce burnt area and wildfire risk transmission
Tiago M. Oliveira A B F , Ana M. G. Barros C , Alan A. Ager D and Paulo M. Fernandes E
+ Author Affiliations
- Author Affiliations
A The Navigator Company, Apartado 55, 2901-861 Setúbal, Portugal.
B Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisbon, Portugal.
C College of Forestry, Oregon State University, 3100 SW Jefferson Way, Corvallis, OR 97333, USA.
D USDA Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory, 5775 US Highway 10W, Missoula, MT 59808 USA.
E Centro de Investigação e Tecnologias Agroambientais e Biológicas (CITAB), Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal.
F Corresponding author. Email: tiago.oliveira@thenavigatorcompany.com
International Journal of Wildland Fire 25(6) 619-632 https://doi.org/10.1071/WF15146
Submitted: 5 August 2015 Accepted: 25 February 2016 Published: 9 May 2016
Abstract
Wildfires pose complex challenges to policymakers and fire agencies. Fuel break networks and area-wide fuel treatments are risk-management options to reduce losses from large fires. Two fuel management scenarios covering 3% of the fire-prone Algarve region of Portugal and differing in the intensity of treatment in 120-m wide fuel breaks were examined and compared with the no-treatment option. We used the minimum travel time algorithm to simulate the growth of 150 000 fires under the weather conditions historically associated with large fires. Fuel break passive effects on burn probability, area burned, fire size distribution and fire transmission among 20 municipalities were analysed. Treatments decreased large-fire incidence and reduced overall burnt area up to 17% and burn probability between 4% and 31%, depending on fire size class and treatment option. Risk transmission among municipalities varied with community. Although fire distribution shifted and large events were less frequent, mean treatment leverage was very low (1 : 26), revealing a very high cost–benefit ratio and the need for engaging forest owners to act in complementary area-wide fuel treatments. The study assessed the effectiveness of a mitigating solution in a complex socioecological system, contributing to a better-informed wildland fire risk governance process among stakeholders.
Additional keywords: Portugal, risk governance, risk management, wildfire exposure.
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