The Research For Simulation Method Of Forest Fire Spreading

Forest fires and other natural disasters, man-made and natural conditions can cause sudden accident, and strong, not easy to predict. Fire can destroy forest, burning with the process of high temperature and radiation will break the ecological balance, cause huge economic loss of property. Forest fire spreading is combustible by weather and terrain conditions, which is a complex combustion process of movement. According to the features and natural conditions, many countries establish their forest fire spreading models for forest fire monitoring and prediction, and set the forest fire risk grades.This article mainly study on forest fire spread with mathematical modeling methods. Selection of meteorological factors and topographical factors for characteristic factors, based on forest fire spreading models of different factors, through computer simulation, terrain factor different meteorological factors under the action of ground fire spread area, through the simulation results, the conclusions are as follows:First, for a single wind factor induced ground fire simulation, wind direction is constant, surface fire spread area is regular. When the wind speed in the2m/s-6m/s, spread area is a round, regular symmetric elliptic; when the wind speed in the6m/s-10m/s, spread area is a slender symmetric elliptic; wind speed greater than10m/s, the corresponding simulation of fire spreading area into a linear approximation. If the wind becomes partial, head wind to deflect the spread area, irregular changes. Could reflect the real fire situation, it can be applied to the ground surface fire spread under the action of wind power forecast.Secondly, for a single slope under the effect of factors of uphill fire simulation, when the slope angle is less than the range40π/180, fire spread rate with slope angle increases the change is not significant; when the slope angle between (40π/180, π/3), fire spread rate increased with slope angle is increased obviously; when the slope angle between(π/3,π/2), actual situation of fire is difficult to continue to spread, calculate the fire spread rate of little practical significance. For the small slope wind uphill fire spread is basically consistent with the actual situation, has a certain reference value.Finally, forest fire spreading model of mix to roll under the effect of factors, through double factor affect the ground fire simulation and comparison with the traditional model, this model is simulated, no critical point deletion, fire spread fire area boundary region and reliable calculation accuracy, can be used with this condition is similar to the actual fire spread prediction.