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Related Experiment Video

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Wind Tunnel Experiments to Study Chaparral Crown Fires
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Fire ignition patterns to manage prescribed fire behavior: Application to Mediterranean pine forests.

J R Molina1, M Ortega1, F Rodríguez Y Silva1

  • 1Forest Fire Laboratory, Department of Forest Engineering, Universidad de Córdoba, Edificio Leonardo da Vinci, Campus de Rabanales, 14071, Córdoba, Spain.

Journal of Environmental Management
|November 6, 2021
PubMed
Summary

Prescribed fire management can be optimized by understanding ignition patterns. This study reveals how varying ignition patterns and distances significantly alter fire spread rate and flame length, aiding in wildfire hazard reduction and landscape management.

Keywords:
Fire managementFire preventionFlame residence timeFlanking fireFuel treatmentSpot-heading fireStrip-heading fire

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Area of Science:

  • Ecology
  • Forestry
  • Fire Science

Background:

  • Climate change and fuel accumulation are increasing wildfire severity globally.
  • Prescribed fire is a cost-efficient tool for wildfire hazard reduction and landscape management, but faces social and administrative constraints at larger scales.
  • Science-based knowledge on fire behavior, fuel reduction, and tree impacts is crucial for effective prescribed fire use.

Purpose of the Study:

  • To analyze fire behavior under different ignition patterns (strip-heading, flanking, spot-heading) and varying environmental conditions.
  • To quantify the impact of ignition patterns and distances on fire spread rate, flame length, and flame residence time.
  • To provide scientific knowledge supporting the optimal use of prescribed fire in the southern Iberian Peninsula.

Main Methods:

  • Seventy-seven observations from twenty-three prescribed fires were monitored.
  • Non-linear models were developed using environmental variables to predict spread rate and flame length.
  • Analysis focused on common distances between ignition lines and points in the southern Iberian Peninsula.

Main Results:

  • Strip-heading fire increased spread rate and flame length by over 3.5-fold and 1.95-fold, respectively, by altering ignition line distance.
  • Flanking fire reduced spread rate by approximately 50%.
  • Spot-heading fire decreased spread rate by over 78% and flame length by over 41%, but increased flame residence time by 39-132% with greater point distances.

Conclusions:

  • Ignition pattern and distance are critical factors influencing prescribed fire behavior.
  • Findings offer a novel approach to sharing scientific knowledge for optimizing prescribed fire strategies.
  • The research aims to balance fire intensity with ecological impacts on trees, soil, and roots.