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KMID : 1024520130220020173
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Journal of the Environmental Sciences
2013 Volume.22 No. 2 p.173 ~ p.185
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Numerical Experiment on the Variation of Atmospheric Circulation due to Wild Fire
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Lee Hwa-Woon
Tak Sung-Hoon
Lee Soon-Hwan
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Abstract
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In order to clarify the impact of wildfire and its thermal forcing on atmospheric wind and temperature patterns, several numerical experiments were carried out using three dimensional atmospheric dynamic model WRF with wildfire parametrization module SFIRE. Since wind can accelerate fire spread speed, the moving speed of fireline is faster than its initial values, and the fireline tends to move the northeast, because of the wind direction and absolute vorticity conservation law associated with driving force induced by terrain. In comparison with non-fire case, the hydraulic jump that often occurs over downwind side of mountain became weak due to huge heat flux originated by surface wildfire and wind pattern over downwind side of mountain tends to vary asymmetrically with time passing. Therefore temporal variation of wind pattern should be catched to prevent the risk of widfire.
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KEYWORD
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WRF-FIRE, Fireline, Absolute vorticity, Hydraulic jump, Heat flux
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