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Numerical Experiment on the Variation of Atmospheric Circulation due to Wild Fire

산불 발화에 따른 하층 대기 순환장 변화에 관한 수치 실험

  • Lee, Hwa-Woon (Division of Earth Environmental System, Pusan National University) ;
  • Tak, Sung-Hoon (Division of Earth Environmental System, Pusan National University) ;
  • Lee, Soon-Hwan (Institude of Environmental Studies, Pusan National University)
  • 이화운 (부산대학교 지구환경시스템학부) ;
  • 탁성훈 (부산대학교 지구환경시스템학부) ;
  • 이순환 (부산대학교 환경연구원)
  • Received : 2012.09.27
  • Accepted : 2013.02.21
  • Published : 2013.02.28

Abstract

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.

Keywords

WRF-FIRE;Fireline;Absolute vorticity;Hydraulic jump;Heat flux

Acknowledgement

Supported by : 부산대학교

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  2. Development of Optimal Modeling System for Analyzing Mountain Micrometeorology vol.17, pp.2, 2015, https://doi.org/10.5532/KJAFM.2015.17.2.165
  3. Multi-Temporal Analysis of Forest Fire Probability Using Socio-Economic and Environmental Variables vol.11, pp.1, 2019, https://doi.org/10.3390/rs11010086