Skip to Main Content
Mean and turbulent flow downstream of a low-intensity fire: influence of canopy and background atmospheric conditionsAuthor(s): Michael T. Kiefer; Warren E. Heilman; Shiyuan Zhong; Joseph J. Charney; Xindi Bian
Source: Journal of Applied Meteorology and Climatology. 54(1): 42-57.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
PDF: Download Publication (3.5 MB)
Related Research Highlights
Unraveling the Mysteries of Fire-induced Weather
DescriptionThis study examines the sensitivity of mean and turbulent flow in the planetary boundary layer and roughness sublayer to a low-intensity fire and evaluates whether the sensitivity is dependent on canopy and background atmospheric properties. The ARPS-CANOPY model, a modified version of the Advanced Regional Prediction System (ARPS) model with a canopy parameterization, is utilized for this purpose. A series of numerical experiments are conducted to evaluate whether the ability of the fire to alter downstream wind, temperature, turbulent kinetic energy (TKE), and vertical heat flux differs between forested and open areas, sparse and dense forests, weak and strong background flow, and neutral and convective background stability. Analysis of all experiments shows that, in general, mean and turbulent flow both prior to and during a low-intensity fire is damped in the presence of a canopy. Greater sensitivity to the fire is found in cases with strong ambient wind speed than in cases with quiescent or weak wind speed. Furthermore, sensitivity of downstream atmospheric conditions to the fire is shown to be strongest with a neutrally stratified background. An analysis of the TKE budget reveals that both buoyancy and wind shear contribute to TKE production during the period of time in which the fire conditions are applied to the model.On the basis of the results of the ARPS simulations, caution is advised when applying ARPS-simulation results to predictions of smoke transport and dispersion: smoke-model users should consider whether canopy impacts on the atmosphere are accounted for and whether neutral stratification is assumed.
- 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, firstname.lastname@example.org 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.
CitationKiefer, Michael T.; Heilman, Warren E.; Zhong, Shiyuan; Charney, Joseph J.; Bian, Xindi. 2015. Mean and turbulent flow downstream of a low-intensity fire: influence of canopy and background atmospheric conditions. Journal of Applied Meteorology and Climatology. 54(1): 42-57.
- Evaluation of an ARPS-based canopy flow modeling system for use in future operational smoke prediction efforts
- Multiscale simulation of a prescribed fire event in the New Jersey Pine Barrens using ARPS-CANOPY
- Regimes of dry convection above wildfires: Idealized numerical simulations and dimensional analysis
XML: View XML