Description of simulation

The program is written in accordance with the methodology Model – View – Controller,so that information during the course of its implementation is quite clear.

In each iteration, reviewed the whole array of forest and the following procedures are performed for each cell:

  1. Checking the type of cells (change in place only for trees).
  2. Checking whether a tree is burning, if not, then:
    1. Checking the number of burning neighbors.
      1. If you burn them enough to ignite it is checked for moisture content of the cell. Coefficient is determined by the aid of wind. Random number is dependent on the calculated coefficient of wind assistance
        • If it is greater than a factor multiplied by the probability of happiness cell ignites.
      2. Otherwise, the cell is only from burning dried neighbors.
    2. Checking whether wind power is big enough to move the fire more than one cell.
      1. If so, is checking whether the direction from which the wind blows, burning the forest and the cell line with a probability depending on the wind power cell is set on fire or not.
  3. If the tree is burning, it is dried with the burning of its neighbors and the fire, its density decreases.
  4. Moisture content of each cell type of the tree is adjusted to the average humidity (for example, can be irrigated in the presence of the river) and the humidity.

So constructed transition function quite well modeled behavior of the burning forest, it is clear how the fire spread. It is close to the actual spread of the fires. The full understanding of this diagram may help:

Automat komórkowy funkcja przejścia - pożar lasu

    In addition:

  • 4. Simulate turning and abandonment of a burning tree, it causes the transfer of fire.
  • 5. Moving fire from higher to lower layers, ie, if the burning crown of trees is probably what is in the flat quickly ignites.
  • 6. Different models of the spread of fire for different types of trees and seasons.
  • 7. Slopes of the northern dry slower, less sunshine.
  • 8. The denser woods are easier to burns (greater likelihood of contact between the branches).

Wind is variable, implemented by using a sinusoidal wave model gives a realistic air gusts of wind. It is also dependent on the terrain, which is different elevations, which are described by layer topographic model. Wind affects fire spread in a manner proportional to its strength. May cause, for example, “skip fire” a canopy. The maximum force, with which it may blow in our simulation is 7 on the Beaufort scale. Distribution of the strength seen in the map in a separate operation during the simulation.

Humidity is determined by the user and is the value to which seek non-linear humidity of each cell. However, in every cell of moisture changes under the influence of environmental conditions (eg, adjacent the river, approaching fire front).

Terrain affects wind power, he is stronger on the slopes consistent with the prevailing wind direction and weaker on the slopes opposite. In addition, affect the transfer of fire (fire slide in August in advance, and accelerate its move into the top).

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