Tool Soil Water Simulation after Glugla (Table)

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

Simpel Homepage
Bonta, J.V., Müller, M. (1999): Evaluation of the Glugla method for estimating evapotranspiration and groundwater recharge. Hydrological Sciences Journal, 44(5):743-761. doi:10.1080/02626669909492271.
Glugla, G. (1969): Berechnungsverfahren zur Ermittlung des aktuellen Wassergehalts und Gravitationswasserabflusses im Boden. Archives of Agronomy and Soil Science, 13(4):371-376. doi:10.1080/03650346909413005.
Hörmann, G. (1997): SIMPEL - ein einfaches, benutzerfreundliches Bodenwassermodell zum Einsatz in der Ausbildung. Deutsche Gewässerkundliche Mitteilungen 41(2):67-72. PDF (unpublished english translation).

Author: O.Conrad (c) 2020
Menu: Simulation|Soil Hydrology

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Input	Table, input	`INPUT`	-	-
Output	Simulation	Table, output	`SIMULATION`	-	-
Options	Day Identifier (*)	Table field	`INPUT_DAY`	Day specifier, e.g. a date field.	-
	Precipitation	Table field	`INPUT_P`	[mm]	-
	Potential Evapotranspiration	Table field	`INPUT_ETP`	[mm]	-
	Leaf Area Index (*)	Table field	`INPUT_LAI`	-	-
	Default	Floating point	`INPUT_LAI_DEFAULT`	default value if no attribute has been selected	Default: 0.000000
	Interception Capacity	Floating point	`I_MAX`	Leaf interception capacity [mm] at maximum LAI.	Minimum: 0.000000 Default: 2.000000
	Minimum LAI	Floating point	`LAI_MIN`	Minimum leaf area index.	Minimum: 0.000000 Default: 0.100000
	Maximum LAI	Floating point	`LAI_MAX`	Maximum leaf area index.	Minimum: 0.000000 Default: 4.000000
	Litter Capacity	Floating point	`LITTER_MAX`	[mm]	Minimum: 0.000000 Default: 0.000000
	Litter Drying Factor	Floating point	`LITTER_CF`	Curvature factor determining the drying of the litter storage.	Minimum: 0.000000 Default: 3.000000
	Initial Litter Water Content	Floating point	`LITTER_0`	[mm]	Minimum: 0.000000 Default: 0.000000
	Glugla Coefficient	Floating point	`GLUGLA`	Empirical parameter [mm/day], depends on soil texture and structure.	Minimum: 0.000000 Default: 150.000000
	Rooting	Boolean	`DO_ROOTING`	-	Default: 0
	Output Unit	Choice	`OUTPUT_UNIT`	-	Available Choices: [0] mm [1] vol.% [2] percent of field capacity Default: 0
	Soil Layers	Static table	`SOIL_LAYERS`	Provide a row for each soil layer: depth [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
	Show Diagram	Choice, GUI	`DIAGRAM`	-	Available Choices: [0] no [1] yes [2] yes, force update Default: 2
(*) optional

Command-line

Usage: saga_cmd sim_hydrology 10 [-INPUT <str>] [-INPUT_DAY <str>] [-INPUT_P <str>] [-INPUT_ETP <str>] [-INPUT_LAI <str>] [-INPUT_LAI_DEFAULT <double>] [-SIMULATION <str>] [-I_MAX <double>] [-LAI_MIN <double>] [-LAI_MAX <double>] [-LITTER_MAX <double>] [-LITTER_CF <double>] [-LITTER_0 <double>] [-GLUGLA <double>] [-DO_ROOTING <str>] [-OUTPUT_UNIT <str>] [-SOIL_LAYERS <str>]
  -INPUT:<str>               	Input
	Table, input
  -INPUT_DAY:<str>           	Day Identifier
	Table field
  -INPUT_P:<str>             	Precipitation
	Table field
  -INPUT_ETP:<str>           	Potential Evapotranspiration
	Table field
  -INPUT_LAI:<str>           	Leaf Area Index
	Table field
  -INPUT_LAI_DEFAULT:<double>	Default
	Floating point
	Default: 0.000000
  -SIMULATION:<str>          	Simulation
	Table, output
  -I_MAX:<double>            	Interception Capacity
	Floating point
	Minimum: 0.000000
	Default: 2.000000
  -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
  -GLUGLA:<double>           	Glugla Coefficient
	Floating point
	Minimum: 0.000000
	Default: 150.000000
  -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