Fire replay and cycling - Revision history

Jmandel at 15:08, 29 April 2016

2016-04-29T15:08:06Z

← Older revision		Revision as of 15:08, 29 April 2016
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	{{users guide}}		{{users guide}}

	To specify the fire arrival time directly instead by the spread model:		To specify the fire arrival time directly instead of the spread model:

	* Replace the variable '''TIGN_G''' in WRF input file by the desired fire arrival time (in seconds since the simulation start)		* Replace the variable '''TIGN_G''' in WRF input file by the desired fire arrival time (in seconds since the simulation start)

Jmandel: wording

2016-04-29T15:06:15Z

wording

← Older revision		Revision as of 15:06, 29 April 2016
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	The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until '''fire_perimerer_time'''. The spread model then takes over.		The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until '''fire_perimerer_time'''. The spread model then takes over.

	If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in namelist.input) or from '''wrfout''' file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are ~~modified to follow~~ the given fire arrival time, but this change at the ~~restart time~~ does not generate heat fluxes.		If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in namelist.input) or from '''wrfout''' file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are area at the restart time are recomputed from the given fire arrival time, but this instantaneous change of the fuel fraction does not generate heat fluxes.

	This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time ~~from~~ data).		This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for an ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time array in response to data).

	===References===		===References===

Jmandel at 06:26, 29 April 2016

2016-04-29T06:26:28Z

← Older revision		Revision as of 06:26, 29 April 2016
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	If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in namelist.input) or from '''wrfout''' file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.		If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in namelist.input) or from '''wrfout''' file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.

	This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for ~~the~~ ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time from data).		This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time from data).

	===References===		===References===

Jmandel at 06:25, 29 April 2016

2016-04-29T06:25:05Z

← Older revision		Revision as of 06:25, 29 April 2016
Line 8:		Line 8:
	The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until '''fire_perimerer_time'''. The spread model then takes over.		The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until '''fire_perimerer_time'''. The spread model then takes over.

	If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in ~~'''~~namelist.input) or from '''~~wrfoutput~~ file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.		If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in namelist.input) or from '''wrfout''' file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.

	This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for the ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time from data).		This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for the ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time from data).

Jmandel: {{users guide}}

2016-04-29T06:17:40Z

← Older revision		Revision as of 06:17, 29 April 2016
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			{{users guide}}

	To specify the fire arrival time directly instead by the spread model:		To specify the fire arrival time directly instead by the spread model:

Jmandel: misc

2016-04-29T06:16:36Z

misc

← Older revision		Revision as of 06:16, 29 April 2016
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	To specify the fire arrival time directly instead by the spread model:		To specify the fire arrival time directly instead by the spread model:

	* Replace the variable '''TIGN_G''' in WRF input file by the desired fire ~~arrdival~~ time (in seconds since the simulation start)		* Replace the variable '''TIGN_G''' in WRF input file by the desired fire arrival time (in seconds since the simulation start)
	* Set '''fire_perimerer_time''' in the '''fire''' section of '''namelist.input'''		* Set '''fire_perimerer_time''' in the '''fire''' section of '''namelist.input'''

	The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until ~~time~~ '''t'''. The spread model then takes over.		The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until '''fire_perimerer_time'''. The spread model then takes over.

	If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in '''namelist.input) or from '''wrfoutput file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.		If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in '''namelist.input) or from '''wrfoutput file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.

Jmandel: Created page with "To specify the fire arrival time directly instead by the spread model: * Replace the variable '''TIGN_G''' in WRF input file by the desired fire arrdival time (in seconds sin..."

2016-04-29T06:15:47Z

Created page with "To specify the fire arrival time directly instead by the spread model: * Replace the variable '''TIGN_G''' in WRF input file by the desired fire arrdival time (in seconds sin..."

New page

To specify the fire arrival time directly instead by the spread model:

* Replace the variable '''TIGN_G''' in WRF input file by the desired fire arrdival time (in seconds since the simulation start)
* Set '''fire_perimerer_time''' in the '''fire''' section of '''namelist.input'''

The specified fire arrival time will be used to replay the fire, which generates heat fluxes into the atmosphere as usual, until time '''t'''. The spread model then takes over.

If WRF is restarted from '''wrfrst''' file (set '''restart=.true.''' in '''namelist.input) or from '''wrfoutput file (set '''cycling=.true.''' in '''namelist.input''') where '''TIGN_G''' at the restart time has been changed, then the fuel fraction and fire are are modified to follow the given fire arrival time, but this change at the restart time does not generate heat fluxes.

This feature allows a gradual spin up of the atmosphere over the period from the restart to '''fire_perimerer_time''', to develop circulation from the fire forcing. It can be used for the ignition from a given fire perimeter (by creating an artificial fire arrival time from the perimeter), and for data assimilation (by modifying the fire arrival time from data).

===References===

* Mandel, J., A. K. Kochanski, M. Vejmelka, and J. D. Beezley, '''Data assimilation of satellite fire detection in coupled atmosphere-fire simulations by WRF-SFIRE'''. Advances in Forest Fire Research, D. X. Viegas, ed., Coimbra University Press, 716–724, 2014. {{doi|10.14195/978-989-26-0884-6_80}}

* Jan Mandel, J.D. Beezley, A. K. Kochanski, V. Y. Kondratenko, and M. Kim, '''Assimilation of Perimeter Data and Coupling with Fuel Moisture in a Wildland Fire - Atmosphere DDDAS''', ICCS 2012, [http://dx.doi.org/10.1016/j.procs.2012.04.119 Procedia Computer Science 9, 2012, 1100-1109] {{doi|10.1016/j.procs.2012.04.119}}

* Kondratenko, Volodymyr Y., Jonathan D. Beezley, Adam K. Kochanski, and Jan Mandel, '''Ignition from a Fire Perimeter in a WRF Wildland Fire Model''', 12th Annual WRF User's Workshop, Boulder, CO, June 2011. [http://www.mmm.ucar.edu/wrf/users/workshops/WS2011/Extended%20Abstracts%202011/9_6_Kondratenko_ExtendedAbstract_11.pdf pdf] {{arXiv|1107.2675}} [http://www.openwfm.org/wiki/File:Wrf2011_VK-slides.pdf presentation]