Assignment 13 - Wildfires (Answers).docx

Assignment 13 - Wildfires (Answers).docx - Assignment 13...

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Assignment 13 – Wildfires (Answers) 1. How has the nature of wildfires and human interaction changed over geologic and historic time? Use to burn a lot longer and burn more because of natural burning. Recent increase in fires. 2. Describe the three things required for fire? Oxygen, Heat, and Fuel. 3. Describe the three phases of a wildfire? a. Preignition – Fuel achieves temperature and water content favorable to ignition. Two processes: i. Preheating; fuel losses water and other volatile compounds. ii. Pyrolysis – fuel chemically degraded to produce fuel gasses that ignite the next phase of the fire. b. Combustion begins with ignition, involves release of energy as heat and light ignition does not always lead to wildfires (fuel must be present). Ignition is not a single process, occurs repeatedly as wildfire moves. i. Dominant Types of combustion = flaming combustion and smoldering combustion. c. Extinction – Point at which combustion includes smoldering, ceases.
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