SAGA-GIS Tool Library Documentation (v7.8.2)

Tool SaLEM

This is the implementation of a Soil and Landscape Evolution Model (SaLEM) for the spatiotemporal investigation of soil parent material evolution following a lithologically differentiated approach. The model needs a digital elevation model and (paleo-)climatic data for the simulation of weathering, erosion and transport processes. Weathering is controlled by user defined functions in dependence of climate conditions, local slope, regolith cover and outcropping bedrock lithology. Lithology can be supplied as a set of grids, of which each grid represents the top elevation of the underlying bedrock type.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputInitial Surface ElevationGrid, inputSURFACE_T0--
Initial Regolith Thickness (*)Grid, input, optionalREGOLITH_T0Initial sediment cover (m)-
Allochthone Input (*)Grid, input, optionalALLOCHTHONEAllochthone input in meter per year (e.g. of aeolian origin, 'Loess').-
OutputSurface ElevationGrid, outputSURFACE--
Regolith ThicknessGrid, outputREGOLITH--
DifferenceGrid, outputDIFFERENCE--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
DefaultFloating pointREGOLITH_T0_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 0.000000
DefaultFloating pointALLOCHTHONE_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 0.000000
ClimateParametersCLIMATE-12 Parameters:
- 1.
- 2.
- 3.
- 4. Default: 31.000000
- 5.
- 6.
- 7.
- 8.
- 9.
- 10. Available Choices:
[0] Celsius
[1] Kelvin
Default: 0
- 11. Minimum: 0.000000
Default: 0.600000
- 12. Default: 1
BedrockParametersBEDROCK-5 Parameters:
- 1.
- 2. 2 Fields:
- 1. [string] Frost
- 2. [string] Chemical

- 3.
- 4. Default: 0.0250 * (0.00175 * R + T - Tmax) / (-Tamp * cos(S))
- 5. Default: 0.0002 * exp(-5.0 * R)
TracersParametersTRACERS-8 Parameters:
- 1.
- 2.
- 3. Available Choices:
[0] no
[1] temporarily
[2] permanently
Default: 1
- 4. Minimum: 0.000000
Default: 0.000000
- 5. Minimum: 1
Default: 1
- 6. Default: 1
- 7. Minimum: 0.010000
Default: 0.500000
- 8. Default: 1
Start [Years BP]IntegerTIME_START-Default: 50000
Stop [Years BP]IntegerTIME_STOP-Default: 10000
Step [Years]IntegerTIME_STEP-Minimum: 1
Default: 100
Diffusivity Coefficient Kd [m^2/a]Floating pointDIFFUSIVE_KD-Minimum: 0.000000
Default: 0.010000
NeighbourhoodChoiceDIFFUSIVE_NEIGHBOURS-Available Choices:
[0] Neumann
[1] Moore
Default: 1
(*) optional

Command-line

Usage: saga_cmd sim_landscape_evolution 0 [-SURFACE_T0 <str>] [-REGOLITH_T0 <str>] [-REGOLITH_T0_DEFAULT <double>] [-ALLOCHTHONE <str>] [-ALLOCHTHONE_DEFAULT <double>] [-SURFACE <str>] [-REGOLITH <str>] [-DIFFERENCE <str>] [-CLIMATE_TREND <str>] [-CLIMATE_TREND_YEAR <str>] [-CLIMATE_TREND_T <str>] [-CLIMATE_TREND_T_OFFSET <double>] [-CLIMATE_ANNUAL <str>] [-CLIMATE_ANNUAL_T <str>] [-CLIMATE_ANNUAL_TMIN <str>] [-CLIMATE_ANNUAL_TMAX <str>] [-CLIMATE_ANNUAL_P <str>] [-CLIMATE_ANNUAL_T_UNIT <str>] [-CLIMATE_T_LAPSE <double>] [-CLIMATE_T_LAPSE_CELL <str>] [-BEDROCK_ROCK_LAYERS <str>] [-BEDROCK_WEATHERING <str>] [-BEDROCK_FROST <str>] [-BEDROCK_CHEMICAL <str>] [-TRACERS_POINTS <str>] [-TRACERS_LINES <str>] [-TRACERS_TRIM <str>] [-TRACERS_DIR_RAND <double>] [-TRACERS_H_DENSITY <num>] [-TRACERS_H_RANDOM <str>] [-TRACERS_V_DENSITY <double>] [-TRACERS_V_RANDOM <str>] [-TIME_START <num>] [-TIME_STOP <num>] [-TIME_STEP <num>] [-DIFFUSIVE_KD <double>] [-DIFFUSIVE_NEIGHBOURS <str>]
  -SURFACE_T0:<str>               	Initial Surface Elevation
	Grid, input
  -REGOLITH_T0:<str>              	Initial Regolith Thickness
	Grid, input, optional
  -REGOLITH_T0_DEFAULT:<double>   	Default
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -ALLOCHTHONE:<str>              	Allochthone Input
	Grid, input, optional
  -ALLOCHTHONE_DEFAULT:<double>   	Default
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -SURFACE:<str>                  	Surface Elevation
	Grid, output
  -REGOLITH:<str>                 	Regolith Thickness
	Grid, output
  -DIFFERENCE:<str>               	Difference
	Grid, output
  -CLIMATE_TREND:<str>            	Long-term Temperature Signal
	Table, input
  -CLIMATE_TREND_YEAR:<str>       	Year
	Table field
  -CLIMATE_TREND_T:<str>          	Temperature
	Table field
  -CLIMATE_TREND_T_OFFSET:<double>	Temperature Offset
	Floating point
	Default: 31.000000
  -CLIMATE_ANNUAL:<str>           	Annual Climate
	Table, input
  -CLIMATE_ANNUAL_T:<str>         	Mean Temperature
	Table field
  -CLIMATE_ANNUAL_TMIN:<str>      	Minimum Temperature
	Table field
  -CLIMATE_ANNUAL_TMAX:<str>      	Maximum Temperature
	Table field
  -CLIMATE_ANNUAL_P:<str>         	Precipitation
	Table field
  -CLIMATE_ANNUAL_T_UNIT:<str>    	Temperature Unit
	Choice
	Available Choices:
	[0] Celsius
	[1] Kelvin
	Default: 0
  -CLIMATE_T_LAPSE:<double>       	Temperature Lapse Rate
	Floating point
	Minimum: 0.000000
	Default: 0.600000
  -CLIMATE_T_LAPSE_CELL:<str>     	Temperature Height Correction
	Boolean
	Default: 1
  -BEDROCK_ROCK_LAYERS:<str>      	Lithology
	Grid list, input, optional
  -BEDROCK_WEATHERING:<str>       	Weathering Formulas
	Static table
	2 Fields:
	- 1. [string] Frost
	- 2. [string] Chemical
	
  -BEDROCK_FROST:<str>            	Frost Weathering
	Text
	Default: 0.0250 * (0.00175 * R + T - Tmax) / (-Tamp * cos(S))
  -BEDROCK_CHEMICAL:<str>         	Chemical Weathering
	Text
	Default: 0.0002 * exp(-5.0 * R)
  -TRACERS_POINTS:<str>           	Tracer
	Shapes, output, optional
  -TRACERS_LINES:<str>            	Tracer Paths
	Shapes, output, optional
  -TRACERS_TRIM:<str>             	Trim
	Choice
	Available Choices:
	[0] no
	[1] temporarily
	[2] permanently
	Default: 1
  -TRACERS_DIR_RAND:<double>      	Randomize Direction
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -TRACERS_H_DENSITY:<num>        	Horizontal Density
	Integer
	Minimum: 1
	Default: 1
  -TRACERS_H_RANDOM:<str>         	Randomize
	Boolean
	Default: 1
  -TRACERS_V_DENSITY:<double>     	Vertical Density
	Floating point
	Minimum: 0.010000
	Default: 0.500000
  -TRACERS_V_RANDOM:<str>         	Randomize
	Boolean
	Default: 1
  -TIME_START:<num>               	Start [Years BP]
	Integer
	Default: 50000
  -TIME_STOP:<num>                	Stop [Years BP]
	Integer
	Default: 10000
  -TIME_STEP:<num>                	Step [Years]
	Integer
	Minimum: 1
	Default: 100
  -DIFFUSIVE_KD:<double>          	Diffusivity Coefficient Kd [m^2/a]
	Floating point
	Minimum: 0.000000
	Default: 0.010000
  -DIFFUSIVE_NEIGHBOURS:<str>     	Neighbourhood
	Choice
	Available Choices:
	[0] Neumann
	[1] Moore
	Default: 1