CBM Smoke Management & Post-Burn Evaluation 2

Question 1

Which atmospheric condition creates the greatest risk of smoke intrusion into valley communities during a prescribed burn?

Accepted Answer

Stable nocturnal inversion layer

Answer

A stable nocturnal inversion traps smoke near the surface, preventing vertical mixing and allowing smoke to flow downslope into communities.

Question 2

Under the USDA Smoke Management Guidelines, what is the primary purpose of calculating a Ventilation Index (VI)?

Accepted Answer

Determining the potential for smoke dispersal based on mixing height and transport wind speed

Answer

The Ventilation Index combines mixing height and transport wind speed to quantify the atmosphere's ability to dilute and carry away smoke.

Question 3

A burn manager observes that smoke is lying flat and drifting slowly along the ground after ignition. This condition most likely indicates:

Accepted Answer

The atmosphere is in a stable state with poor vertical mixing

Answer

Flat, ground-hugging smoke plumes are a visual indicator of atmospheric stability and insufficient convective mixing height.

Question 4

Which post-burn assessment metric best indicates whether fire achieved the desired understory fuel reduction objective?

Accepted Answer

Percent consumption of fine woody debris and litter layer

Answer

Fine woody debris and litter consumption percentage directly measures how thoroughly surface fuels were reduced, which is the primary hazard reduction goal.

Question 5

When documenting post-burn effects for an agency record, which of the following best describes an appropriate method for estimating burn severity?

Accepted Answer

Using the Composite Burn Index (CBI) at systematically placed field plots

Answer

The Composite Burn Index provides a standardized, multi-strata field assessment of burn severity across overstory, understory, and soil layers.

(CBM) Certified Burn Manager Practice Test

(CBM) Certified Burn Manager Practice Test

CBM Smoke Management & Post-Burn Evaluation 2