What is fireline intensity?

What is fireline intensity?

• A. The rate of spread of the fire.
• B. The maximum flame height.
• C. The energy released per unit length of fire front per unit time.
• D. The fuel load per unit area.

Answer: (C)

Fireline intensity is the energy released from the fire front per unit length of front per unit time. In other words, it measures how much heat energy is produced along each meter (or foot) of the fire edge each second. This concept ties together how much fuel is available, how hot that fuel burns, and how fast the front is moving, since a higher energy release along the edge means a hotter, more vigorous front. In prescribed fire planning, higher fireline intensity indicates more challenging conditions for control and a greater potential for vigorous flames or spotting. It is not the speed of the front (rate of spread), not the maximum flame height, and not simply the amount of fuel on the ground (fuel load per unit area).

Fireline intensity is the energy released from the fire front per unit length of front per unit time. In other words, it measures how much heat energy is produced along each meter (or foot) of the fire edge each second. This concept ties together how much fuel is available, how hot that fuel burns, and how fast the front is moving, since a higher energy release along the edge means a hotter, more vigorous front. In prescribed fire planning, higher fireline intensity indicates more challenging conditions for control and a greater potential for vigorous flames or spotting. It is not the speed of the front (rate of spread), not the maximum flame height, and not simply the amount of fuel on the ground (fuel load per unit area).