Institute of Computational Mathematics and Mathematical Geophysics

International Conference on Mathematical Methods in Geophysics «MMG-2003»

Akademgorodok, Novosibirsk, Russia, October 8-12, 2003

Abstracts

Mathematical modeling of environmental protection problems

SOME RESULTS OF NUMERICAL MODELING OF THE PROPAGATION OF SMOKE PLUMES FROM FOREST FIRES

Lezhenin A.A., Mal'bakhov V.M., Shlychkov V.A.

Кrasnoyarsk centre for hydrometeorology and environmental monitoring with regional functions (Krasnoyarsk),
Institute of computional mathematics and mathematical geophysics SB RAS (Novosibirsk),
Institute water and environmental problems SB RAS (Novosibirsk branch) (Novosibirsk)

During forest fires, a strong heat source causes the development of intensive convective motions, and the temperature contrast between the fire zone and the surrounding area leads to the formation of a local circulation. The flow pattern depends on the external wind, the stratification of the main flow, and orographic effects. Vortex-resolving and local numerical models of the atmospheric boundary layer based on the solution to nonhydrostatic equations of hydrothermodynamics are used to calculate local atmospheric circulation in the forest zone. These models can provide a direct description of large turbulent vortices generated in the convective instability zone over the fire. A hydrostatic model of the atmospheric boundary layer with step of a grid across some tens kilometers is used to study mesoscale transfer. The calculated velocity and turbulence fields are used to solve equations of transfer and diffusion of solid particles of the aerosol (smoke). Examples of calculations of smoke propagation for the main types of forest fires in various meteorological situations are presented. This work has received financial support from the Russian Foundation for Basic Research (Grant No. 03-05-65279).

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