SAGA-GIS Tool Library Documentation (v9.2.0)

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 point numberLAI_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 0.000000
Grid systemgrid systemGLUGLA_GRIDSYSTEM--
Defaultfloating point numberGLUGLA_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 150.000000
Interception Capacityfloating point numberI_MAXLeaf interception capacity [mm] at maximum LAI.Minimum: 0.000000
Default: 0.000000
Minimum LAIfloating point numberLAI_MINMinimum leaf area index.Minimum: 0.000000
Default: 0.100000
Maximum LAIfloating point numberLAI_MAXMaximum leaf area index.Minimum: 0.000000
Default: 4.000000
Litter Capacityfloating point numberLITTER_MAX[mm]Minimum: 0.000000
Default: 0.000000
Litter Drying Factorfloating point numberLITTER_CFCurvature factor determining the drying of the litter storage.Minimum: 0.000000
Default: 3.000000
Initial Litter Water Contentfloating point numberLITTER_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 number
	Minimum: 0.000000
	Default: 0.000000
  -GLUGLA:<str>           	Glugla Coefficient
	grid, input, optional
  -GLUGLA_DEFAULT:<double>	Default
	floating point number
	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 number
	Minimum: 0.000000
	Default: 0.000000
  -LAI_MIN:<double>       	Minimum LAI
	floating point number
	Minimum: 0.000000
	Default: 0.100000
  -LAI_MAX:<double>       	Maximum LAI
	floating point number
	Minimum: 0.000000
	Default: 4.000000
  -LITTER_MAX:<double>    	Litter Capacity
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -LITTER_CF:<double>     	Litter Drying Factor
	floating point number
	Minimum: 0.000000
	Default: 3.000000
  -LITTER_0:<double>      	Initial Litter Water Content
	floating point number
	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