The Burn Simulation
The simulation itself is pretty easy to understand: The forest is an area of cells, each cell representing a tree or empty space. A tree is characterized by the following variables:
The empty space (i.e. cells which are no trees) are displayed white.
You now do the following: Decide on a tree density; a value between 0 and 1
which represents the ratio of trees among all cells (all other cells stay
empty). Then, set fire ("ignite") some of the trees
(by clicking on them with the mouse in QXBurn
or using the auto-ignition). Then start the sim and watch what happens:
What you will see...
You will notice that there is a certain tree density called the critical tree density. If there are fewer trees, only very few of them will burn no matter how many you initially ignite. If you are above the critical density, (nearly) the complete forest will go up in flames even if you initially set fire on just a few trees.
What was described above is what you can do with
QXBurn. Change the tree density just a
little, run the sim again, change the density, run again, etc. will give
you a feeling for the critical density. You can do that fairly quickly
using auto-ignition, see the program page for
QXBurn for details and a screen shot.
If you feel you need the burn simulation, go to the download page.