Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub

    Description

    A two-dimensional nonhydrostatic atmospheric model is used to simulate the boundary-layer circulations that develop from multiple lines of extremely high surface temperatures. Numerical simulations are carried out to investigate the role of buoyancy and ambient crossflow effects in generating horizontal roll vortices in the vicinity of adjacent wildland fire perimeters. Numerical results suggest that the downdraft segments of buoyancy-generated horizontal roll vortices can be reinforced when multiple heating lines are present, with the degree of reinforcement dependent on the heating-line spacing. Significant low-level horizontal flow directly over the bounding heating lines is observed in some simulations, suggesting a mechanism for low-level flame migration in actual wildland fires. Multiple heating lines also affect the development and behavior of buoyancy-generated horizontal roll vortices when ambient crossflows are present. Simulations indicate that vortices are more likely to persist for multiple heating lines than for a single heating line when light ambient crossflows are introduced. Although simulation results should be viewed qualitatively, they suggest the potential importance of adjacent fire perimeters in actual wildland fire episodes for the development and behavior of buoyancy-generated horizontal roll vortices.

    Publication Notes

    • Check the Northern Research Station web site to request a printed copy of this publication.
    • Our on-line publications are scanned and captured using Adobe Acrobat.
    • During the capture process some typographical errors may occur.
    • Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Heilman, W.E. 1994. Simulations of buoyancy-generated horizontal roll vortices over multiple heating lines. Forest Science. 40(4): 601-617.

    Keywords

    Nonhydrostatic model, vorticity, pressure perturbations, circulation.

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/47956