5.3-firePercolation.nlogo

;; The MIT License (MIT)
;;
;; Copyright (c) 2011-24 David O'Sullivan and George Perry
;;
;; Permission is hereby granted, free of charge, to any person
;; obtaining a copy of this software and associated documentation
;; files (the "Software"), to deal in the Software without restriction,
;; including without limitation the rights to use, copy, modify, merge,
;; publish, distribute, sublicense, and/or sell copies of the Software,
;; and to  permit persons to whom the Software is furnished to do so,
;; subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included
;; in all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
;; OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;; DEALINGS IN THE SOFTWARE.
;;

globals [
  fire-front     ; the latest round of burning patches
  fire-size      ; total aread burned by the current fire
  forest-color   ;
  s              ; stores the random-seed for behaviour space experiments
]

to setup
  clear-all
  ;; get, store and set a random-seed
  set s new-seed
  random-seed s
  set forest-color green + 3
  ask n-of (p * count patches) patches [
    set pcolor forest-color
  ]
  set fire-front patch-set nobody
  reset-ticks
end


;; a whole fire
to go
  ask patches with [shade-of? orange pcolor] [set pcolor forest-color]
  ignite-fire
  while [any? fire-front] [
    advance-fire
    tick
  ]
  wait 0.1
  reset-ticks
end


to ignite-fire
  set fire-size 0
  ask one-of patches with [pcolor = forest-color] [
    set pcolor orange + 2
    set fire-front patch-set self
  ]
end

to advance-fire
  ask fire-front [set pcolor pcolor - 4]
  ;; Empty set of patches for the next 'round' of the fire
  let new-fire-front patch-set nobody
  ;; advance into neighboring patches that are forested
  set new-fire-front ((patch-set [neighbors4] of fire-front) with [pcolor = forest-color])
  ask new-fire-front [set pcolor orange + 2]
  set fire-front new-fire-front
end
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BUTTON
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setup
setup
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OBSERVER
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MONITOR
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Size
count patches with [pcolor = red]
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OBSERVER
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BUTTON
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repeat-fires
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OBSERVER
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NIL
1

@#$#@#$#@
## WHAT IS IT?

This model is a simple percolation-based model of fire spread (or any other contagious process).  It is discussed in Chapter 5 of

+   O'Sullivan D and Perry GLW 2013 _Spatial Simulation: Exploring Pattern and Process_. Wiley, Chichester, England.

You should consult that book for more information and details of the model.

## THINGS TO NOTICE

This model has been reorganised slightly so you can trigger a single fire or let it repeatedly produce one fire after another in the same system. There is a good opportunity here to see how the NetLogo screen update method can be used to advantage. In 'continuous' mode, the fires appear rapidly and continuously. In 'ticks' mode you see how the fires spread. The marked difference in the apparent speed of the model is entirely due to how NetLogo is handling screen updates. An important lesson in paying attention to this aspect of model design!

## HOW TO CITE

If you mention this model in a publication, please include these citations for the model itself and for NetLogo

+   O'Sullivan D and Perry GLW 2013 _Spatial Simulation: Exploring Pattern and Process_. Wiley, Chichester, England.
+   Wilensky U 1999 NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.

## COPYRIGHT AND LICENSE

The MIT License (MIT)

Copyright © 2011-24 David O'Sullivan and George Perry

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to  permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
@#$#@#$#@
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NetLogo 6.4.0
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<experiments>
  <experiment name="nshells-expt" repetitions="50" runMetricsEveryStep="false">
    <setup>setup</setup>
    <go>go</go>
    <exitCondition>not any? fire-front and any? patches with [shade-of? orange pcolor]</exitCondition>
    <metric>count patches with [shade-of? orange pcolor]</metric>
    <steppedValueSet variable="p" first="0.5" step="0.01" last="0.75"/>
  </experiment>
</experiments>
@#$#@#$#@
@#$#@#$#@
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