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Thermocouple Probe Orientation Affects Prescribed Fire Behavior Estimation.

T Adam Coates, Alex T Chow, Donald L Hagan

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    Summary
    This summary is machine-generated.

    Thermocouple orientation significantly impacts fire behavior metrics. Horizontal placement at the litter-soil interface yields higher estimates of peak temperature and heating duration than vertical placement, crucial for prescribed fire management.

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    Area of Science:

    • Forestry
    • Fire Ecology
    • Ecological Restoration

    Background:

    • Understanding fire intensity and fuel mass is crucial for effective prescribed fire management.
    • Thermocouple-datalogger assemblies are commonly used to measure fire behavior metrics like peak burning temperature and heating duration.
    • A standardized protocol for thermocouple installation orientation is lacking in prescribed burn studies.

    Purpose of the Study:

    • To investigate the impact of thermocouple orientation on fire behavior metrics in coastal longleaf pine forests.
    • To compare fire behavior estimates from horizontally placed thermocouples versus vertically placed ones.
    • To assess the correlation between different thermocouple orientations and fuel characteristics.

    Main Methods:

    • Conducted prescribed burns in coastal longleaf pine forests during dormant and growing seasons.
    • Installed thermocouples horizontally at the litter-soil interface and vertically 28 cm above it.
    • Measured peak burning temperature, duration of heating, and area under the temperature profile.
    • Assessed pre- and post-fire fuel mass and depth.

    Main Results:

    • Horizontal thermocouples recorded significantly higher peak temperatures, heating durations, and area under the temperature profile compared to vertical ones (p < 0.01).
    • Estimates from horizontal and vertical orientations showed weak correlation (r ≤ 0.14).
    • Horizontal heating duration was greater in growing season burns than dormant season burns (p < 0.01), a difference not observed with vertical placement (p = 0.52).
    • Fuel mass and depth were significant predictors of fire behavior metrics, but correlations were moderate (r ≤ 0.41).

    Conclusions:

    • Thermocouple orientation critically influences fire behavior metric estimations.
    • Horizontal placement at the litter-soil interface provides higher estimates of fire intensity and heating duration.
    • Careful consideration of thermocouple orientation is essential for accurate fire behavior assessment and distinguishing fire treatment effects, especially in litter-dominated forests.