Turbulence Spectra and Cospectra Measured during Fire Front Passage Daisuke Seto, Craig B. Clements, and Daisuke Seto, Craig B. Clements, and Fred Snively Fred Snively Department of Meteorology and Climate Department of Meteorology and Climate Science Science San José State University San José State University San José, CA San José, CA Warren E. Heilman Warren E. Heilman Northern Research Station Northern Research Station USDA Forest Service USDA Forest Service East Lansing, MI East Lansing, MI San José State University Fire Weather Research Laboratory
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Turbulence Spectra and Cospectra Measured during Fire Front Passage Daisuke Seto, Craig B. Clements, and Fred Snively Department of Meteorology and Climate.
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Turbulence Spectra and Cospectra Measured during Fire Front Passage
Daisuke Seto, Craig B. Clements, and Fred SnivelyDaisuke Seto, Craig B. Clements, and Fred SnivelyDepartment of Meteorology and Climate ScienceDepartment of Meteorology and Climate Science
San José State UniversitySan José State UniversitySan José, CASan José, CA
Warren E. Heilman Warren E. Heilman Northern Research StationNorthern Research Station
USDA Forest Service USDA Forest Service East Lansing, MIEast Lansing, MI
San José State UniversityFire Weather Research Laboratory
Overview of Presentation
• Background
• Experimental datasets
• Data processing
• Results– Velocity and temperature spectra– Momentum and heat flux cospectra
• Preliminary Conclusion
• Future WorkSan José State University
Fire Weather Research Laboratory
Background and Motivation
• Fire-atmosphere coupling occurs over spatial scales from tens of meters to kilometers.
→spectral analysis of in-situ turbulence data allows for the general description of turbulence structure over frequency domain.
• Fire spread rate predictions would be improved by accounting for the effect of turbulence (Albini 1983; Sun et al. 2009).
• Spectral analysis is used for – parameterizing eddy diffusivities – estimating dispersion coefficients
• Validity of surface layer similarity theory must be questioned when used for wildland fire applications.
San José State UniversityFire Weather Research Laboratory
Experimental Datasets
San José State UniversityFire Weather Research Laboratory