Fire Whirl Formation During a Valley Wind Reversal Daisuke Seto, Craig B. Clements, and Scott Strenfel Department of Meteorology San José State University.

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Presentation transcript:

Fire Whirl Formation During a Valley Wind Reversal Daisuke Seto, Craig B. Clements, and Scott Strenfel Department of Meteorology San José State University San José, CA Warren E. Heilman and Xindi Bian Northern Research Station USDA Forest Service East Lansing, MI

Overview of Presentation Background Experimental design & instrument setup Observations - High-frequency wind data - Turbulence Kinetic Energy - Momentum fluxes Summary Future work

Fire Whirl Formation Location: Joseph D. Grant State Park (10mi. E of San Jose) Date: 7 Oct 2008 Movie: Andrew Joros Edit: Scott Strenfel

Experimental Design 20 ft tower – 10 Hz turbulence (18’, 276° ) – 1 Hz temperature & RH – 4 fine-wire theromocouples – Heat flux and CO 2 Tripod – wind speed & direction – temperature & RH

Topography

Wind speed and direction Fire whirl

High frequency horizontal winds

High frequency vertical wind

Std dev? Intensity?

Preliminary wind analysis

Summary

Future Work Run numerical model for simulation of fire whirl formation.

Acknowledgements