SAGA-GIS Tool Library Documentation (v9.1.2)

Tool Soil Water Simulation after Glugla (Grid)

A simple model for daily soil water simulation based on the approach of Glugla (1969).

This is a re-implementation of the formulas used in the 'Simpel' model developed by Hörmann (1998), "...covering the lowest, serious end of hydrologic computing".

References

Parameters

 NameTypeIdentifierDescriptionConstraints
InputPrecipitationGrid list, inputP[mm]-
Potential EvapotranspirationGrid list, inputETP[mm]-
Field Capacity (*)Grid list, input, optionalFC[vol.%]-
Permanent Wilting Point (*)Grid list, input, optionalPWP[vol.%]-
Maxmimum Evapotranspiration (*)Grid list, input, optionalETMAX[vol.%/day]-
Leaf Area Index (*)Grid, input, optionalLAI--
Glugla Coefficient (*)Grid, input, optionalGLUGLAEmpirical parameter [mm/day], depends on soil texture and structure.-
OutputSoil Water ContentGrid list, outputSOIL_WATER--
Litter Water ContentGrid, outputLITTER[mm]-
Recharge (*)Grid, output, optionalRECHARGE[mm]-
Recharge Sum (*)Grid, output, optionalRECHARGE_SUM[mm]-
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
Grid systemGrid systemLAI_GRIDSYSTEM--
DefaultFloating pointLAI_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 0.000000
Grid systemGrid systemGLUGLA_GRIDSYSTEM--
DefaultFloating pointGLUGLA_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 150.000000
Interception CapacityFloating pointI_MAXLeaf interception capacity [mm] at maximum LAI.Minimum: 0.000000
Default: 0.000000
Minimum LAIFloating pointLAI_MINMinimum leaf area index.Minimum: 0.000000
Default: 0.100000
Maximum LAIFloating pointLAI_MAXMaximum leaf area index.Minimum: 0.000000
Default: 4.000000
Litter CapacityFloating pointLITTER_MAX[mm]Minimum: 0.000000
Default: 0.000000
Litter Drying FactorFloating pointLITTER_CFCurvature factor determining the drying of the litter storage.Minimum: 0.000000
Default: 3.000000
Initial Litter Water ContentFloating pointLITTER_0[mm]Minimum: 0.000000
Default: 0.000000
ResetBooleanRESET-Default: 1
RootingBooleanDO_ROOTING-Default: 0
Output UnitChoiceOUTPUT_UNIT-Available Choices:
[0] mm
[1] vol.%
[2] percent of field capacity
Default: 0
Soil LayersStatic tableSOIL_LAYERSProvide a row for each soil layer: size [cm], field capacity [vol.%], permanent wilting point [vol.%], maximum ET [vol.%/day], rooting [% of total], initial water content [vol.%].6 Fields:
- 1. [8 byte floating point number] Size
- 2. [8 byte floating point number] FC
- 3. [8 byte floating point number] PWP
- 4. [8 byte floating point number] ETmax
- 5. [8 byte floating point number] Rooting
- 6. [8 byte floating point number] Water_0
UpdateBoolean, GUIUPDATE-Default: 0
OverwriteBoolean, GUIOVERWRITEOverwrite soil water grids from previous simulations.Default: 1
(*) optional

Command-line

Usage: saga_cmd sim_hydrology 11 [-P <str>] [-ETP <str>] [-FC <str>] [-PWP <str>] [-ETMAX <str>] [-LAI <str>] [-LAI_DEFAULT <double>] [-GLUGLA <str>] [-GLUGLA_DEFAULT <double>] [-SOIL_WATER <str>] [-LITTER <str>] [-RECHARGE <str>] [-RECHARGE_SUM <str>] [-I_MAX <double>] [-LAI_MIN <double>] [-LAI_MAX <double>] [-LITTER_MAX <double>] [-LITTER_CF <double>] [-LITTER_0 <double>] [-RESET <str>] [-DO_ROOTING <str>] [-OUTPUT_UNIT <str>] [-SOIL_LAYERS <str>]
  -P:<str>                	Precipitation
	Grid list, input
  -ETP:<str>              	Potential Evapotranspiration
	Grid list, input
  -FC:<str>               	Field Capacity
	Grid list, input, optional
  -PWP:<str>              	Permanent Wilting Point
	Grid list, input, optional
  -ETMAX:<str>            	Maxmimum Evapotranspiration
	Grid list, input, optional
  -LAI:<str>              	Leaf Area Index
	Grid, input, optional
  -LAI_DEFAULT:<double>   	Default
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -GLUGLA:<str>           	Glugla Coefficient
	Grid, input, optional
  -GLUGLA_DEFAULT:<double>	Default
	Floating point
	Minimum: 0.000000
	Default: 150.000000
  -SOIL_WATER:<str>       	Soil Water Content
	Grid list, output
  -LITTER:<str>           	Litter Water Content
	Grid, output
  -RECHARGE:<str>         	Recharge
	Grid, output, optional
  -RECHARGE_SUM:<str>     	Recharge Sum
	Grid, output, optional
  -I_MAX:<double>         	Interception Capacity
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -LAI_MIN:<double>       	Minimum LAI
	Floating point
	Minimum: 0.000000
	Default: 0.100000
  -LAI_MAX:<double>       	Maximum LAI
	Floating point
	Minimum: 0.000000
	Default: 4.000000
  -LITTER_MAX:<double>    	Litter Capacity
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -LITTER_CF:<double>     	Litter Drying Factor
	Floating point
	Minimum: 0.000000
	Default: 3.000000
  -LITTER_0:<double>      	Initial Litter Water Content
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -RESET:<str>            	Reset
	Boolean
	Default: 1
  -DO_ROOTING:<str>       	Rooting
	Boolean
	Default: 0
  -OUTPUT_UNIT:<str>      	Output Unit
	Choice
	Available Choices:
	[0] mm
	[1] vol.%
	[2] percent of field capacity
	Default: 0
  -SOIL_LAYERS:<str>      	Soil Layers
	Static table
	6 Fields:
	- 1. [8 byte floating point number] Size
	- 2. [8 byte floating point number] FC
	- 3. [8 byte floating point number] PWP
	- 4. [8 byte floating point number] ETmax
	- 5. [8 byte floating point number] Rooting
	- 6. [8 byte floating point number] Water_0