Tool Cold Air Flow

A simple cold air flow simulation.

References

Schwab, A. (2000): Reliefanalytische Verfahren zur Abschaetzung naechtlicher Kaltluftbewegungen. Freiburger Geographische Hefte, 61.

Author: O.Conrad, H.Dietrich (c) 2020
Menu: Simulation|Air Flow

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	Grid, input	`DEM`	-	-
	Production (*)	Grid, input, optional	`PRODUCTION`	Rate of cold air production [m/h].	-
	Surface Friction Coefficient (*)	Grid, input, optional	`FRICTION`	Surface friction coefficient.	-
Output	Cold Air Height	Grid, output	`AIR`	-	-
Output	Velocity (*)	Grid, output, optional	`VELOCITY`	-	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Default	Floating point	`PRODUCTION_DEFAULT`	default value if no grid has been selected	Minimum: 0.000000 Default: 1.000000
	Default	Floating point	`FRICTION_DEFAULT`	default value if no grid has been selected	Minimum: 0.000000 Default: 1.000000
	Reset	Boolean	`RESET`	-	Default: 1
	Simulation Time [h]	Floating point	`TIME_STOP`	Simulation time in hours.	Minimum: 0.000000 Default: 6.000000
	Map Update Frequency [min]	Floating point	`TIME_UPDATE`	-	Minimum: 0.000000 Default: 10.000000
	Edge	Choice	`EDGE`	-	Available Choices: [0] closed [1] open Default: 1
	Time Step Adjustment	Floating point	`DELAY`	Choosing a lower value will result in a better numerical precision but also in a longer calculation time.	Minimum: 0.010000 Maximum: 1.000000 Default: 0.500000
	Surrounding Air Temperature	Floating point	`T_AIR`	Surrounding air temperature [degree Celsius].	Minimum: -273.150000 Default: 15.000000
	Cold Air Temperature	Floating point	`T_AIR_COLD`	Cold air temperature [degree Celsius].	Minimum: -273.150000 Default: 5.000000
(*) optional

Command-line

Usage: saga_cmd sim_air_flow 0 [-DEM <str>] [-PRODUCTION <str>] [-PRODUCTION_DEFAULT <double>] [-FRICTION <str>] [-FRICTION_DEFAULT <double>] [-AIR <str>] [-VELOCITY <str>] [-RESET <str>] [-TIME_STOP <double>] [-TIME_UPDATE <double>] [-EDGE <str>] [-DELAY <double>] [-T_AIR <double>] [-T_AIR_COLD <double>]
  -DEM:<str>                  	Elevation
	Grid, input
  -PRODUCTION:<str>           	Production
	Grid, input, optional
  -PRODUCTION_DEFAULT:<double>	Default
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -FRICTION:<str>             	Surface Friction Coefficient
	Grid, input, optional
  -FRICTION_DEFAULT:<double>  	Default
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -AIR:<str>                  	Cold Air Height
	Grid, output
  -VELOCITY:<str>             	Velocity
	Grid, output, optional
  -RESET:<str>                	Reset
	Boolean
	Default: 1
  -TIME_STOP:<double>         	Simulation Time [h]
	Floating point
	Minimum: 0.000000
	Default: 6.000000
  -TIME_UPDATE:<double>       	Map Update Frequency [min]
	Floating point
	Minimum: 0.000000
	Default: 10.000000
  -EDGE:<str>                 	Edge
	Choice
	Available Choices:
	[0] closed
	[1] open
	Default: 1
  -DELAY:<double>             	Time Step Adjustment
	Floating point
	Minimum: 0.010000
	Maximum: 1.000000
	Default: 0.500000
  -T_AIR:<double>             	Surrounding Air Temperature
	Floating point
	Minimum: -273.150000
	Default: 15.000000
  -T_AIR_COLD:<double>        	Cold Air Temperature
	Floating point
	Minimum: -273.150000
	Default: 5.000000