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    Author(s): Warren E. HeilmanXindi Bian
    Date: 2010
    Source: In: Proceedings of the 3rd fire behavior and fuels conference; 2010 October 25-29; Spokane, WA. Birmingham AL: International Association of Wildland Fire. 8 p. [On CD-ROM].
    Publication Series: Other
    Station: Northern Research Station
    PDF: View PDF  (342.83 KB)

    Description

    Combining the Haines Index (HI) with near-surface turbulent kinetic energy (TKEs) through a product of the two values (HITKEs) has shown promise as an indicator of the atmospheric potential for extreme and erratic fire behavior in the U.S. Numerical simulations of fire-weather evolution during past wildland fire episodes in the U.S. indicate that large wildfires and periods of rapid fire growth are often associated with and accompanied by periods of significant near-surface atmospheric turbulence. These findings provide new insight into the variability of ambient atmospheric turbulence during wildfire events over relatively short time periods. However, the ultimate application of a fire-weather index based on the product of the HI and TKEs in fire-weather forecasts requires an understanding of where and when high values of the index typically occur. This study examines the spatial and temporal variability of TKEs and HITKEs values over the U.S. using North American Regional Reanalysis (NARR) data. Study results indicate that there are preferred locations and periods for large TKEs and HITKEs values, the temporal variability of TKEs and HITKEs is regionally dependent, and there has been a general increase in TKEs and HITKEs values over much of the U.S. over the last 30 years.

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    Citation

    Heilman, Warren E.; Bian, Xindi. 2010 Climatic variability of a fire-weather index based on turbulent kinetic energy and the Haines Index. In: Proceedings of the 3rd fire behavior and fuels conference; 2010 October 25-29; Spokane, WA. Birmingham AL: International Association of Wildland Fire. 8 p. [On CD-ROM].

    Keywords

    turbulence, wildfire

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