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Wildfires

Week 9. Wildfires. Would you live in an area prone to wildfires? If so, where? What level of risk from wildfires is acceptable to you? (How would you know if the subsidence risk was assessed accurately?)

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Wildfires

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  1. Week 9 Wildfires

  2. Would you live in an area prone to wildfires? If so, where? What level of risk from wildfires is acceptable to you? (How would you know if the subsidence risk was assessed accurately?) What should be done by people and communities in areas prone to wildfires to prepare for the hazard and prevent catastrophe? Questions for discussion

  3. What factors influence the impact of wildfires? How do wildfire hazards vary from place to place? Why? The five concepts from Chapter 1 Other questions to consider

  4. What is it? • Self-sustaining • Rapid • High temperature • “Biochemical oxidation reaction” • Releases • Heat • Light • Other products Wildfires

  5. Wildfire requirements

  6. Preignition – preheating & pyrolosis • Temperature increases • Water content decreases • Combustion • Ignition • Flaming • Glowering/smoldering • Extinction Wildfire phases

  7. Parts of a wildfire

  8. Sufficient quantity required to maintain fire and allow movement Size Arrangement Moisture content Fire environment - Fuel

  9. South-facing slopes • Exposure to prevailing winds • Steep slopes • Dry conditions • Rain • Humidity • Wind Fire environment – topography & weather

  10. Ground Surface Crown Types of fires

  11. Any place with sufficient fuel • Commonly • Dry grasslands • Forests • Triggers • Drought • Disease • Fire suppression Areas at risk

  12. Water-repellent soils Mass wasting Soil erosion Vegetation Habitat Impact of wildfires

  13. Aesthetic Homes Human impact

  14. Understand fire regime Remote sensing Prescribed burns Building codes Fire insurance Minimizing wildland/urban interface Response to wildfires

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