Studying Forest Fire Spread and Suppression in DEVS

1
Studying Forest Fire Spread and Suppression in
DEVS

• Lewis Ntaimo,
• Bithika Khargharia,
• Bernard P. Zeigler,
• Maria J. Vasconcelos

2
Coupled model structure
Cell Space
Ignite
Wind
Water
Potential neighbor cells to ignite by fire from
center cell.
3
Atomic model structure
Forest Cell State Transitions
Fireline Intensity FI





input

input

input


Make a transition

Make a transition

Make a transition

elapsed

elapsed

time

time

Time advance

Time advance

Phase unburned

If (FI gt Threshold)

Phase burning
holdIn (burning,

else


Compute new spread ( using

passiva
teIn( Unburned)

Rothermels eq)

Compute remaining distance to

reach center of neighbor cell

Compute time delays

4
class hierarchy
5
Experimentation
experimental frame
Cell Space
Ignite
Wind
Water
6
wind across valley floor experiments

7

water meets fire experiment



8
Activity
Ratio of number of burning cells to total cells
in the cell space