Soil Water Simulation after Glugla (Table)

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

Description

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 H_rmann (1998), "...covering the lowest, serious end of hydrologic computing".

References

Simpel Homepage
Bonta, J.V., M_ller, 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.
H_rmann, G. (1997): SIMPEL - ein einfaches, benutzerfreundliches Bodenwassermodell zum Einsatz in der Ausbildung. Deutsche Gew_sserkundliche Mitteilungen 41(2):67-72. PDF (unpublished english translation).

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 number	`INPUT_LAI_DEFAULT`	default value if no attribute has been selected	Default: 0.000000
	Interception Capacity	floating point number	`I_MAX`	Leaf interception capacity [mm] at maximum LAI.	Minimum: 0.000000 Default: 2.000000
	Minimum LAI	floating point number	`LAI_MIN`	Minimum leaf area index.	Minimum: 0.000000 Default: 0.100000
	Maximum LAI	floating point number	`LAI_MAX`	Maximum leaf area index.	Minimum: 0.000000 Default: 4.000000
	Litter Capacity	floating point number	`LITTER_MAX`	[mm]	Minimum: 0.000000 Default: 0.000000
	Litter Drying Factor	floating point number	`LITTER_CF`	Curvature factor determining the drying of the litter storage.	Minimum: 0.000000 Default: 3.000000
	Initial Litter Water Content	floating point number	`LITTER_0`	[mm]	Minimum: 0.000000 Default: 0.000000
	Glugla Coefficient	floating point number	`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

Command Line

Usage: saga_cmd sim_hydrology 10 [-INPUT ] [-INPUT_DAY ] [-INPUT_P ] [-INPUT_ETP ] [-INPUT_LAI ] [-INPUT_LAI_DEFAULT ] [-SIMULATION ] [-I_MAX ] [-LAI_MIN ] [-LAI_MAX ] [-LITTER_MAX ] [-LITTER_CF ] [-LITTER_0 ] [-GLUGLA ] [-DO_ROOTING ] [-OUTPUT_UNIT ] [-SOIL_LAYERS ]
  -INPUT:               	Input
	table, input
  -INPUT_DAY:           	Day Identifier
	table field
  -INPUT_P:             	Precipitation
	table field
  -INPUT_ETP:           	Potential Evapotranspiration
	table field
  -INPUT_LAI:           	Leaf Area Index
	table field
  -INPUT_LAI_DEFAULT:	Default
	floating point number
	Default: 0.000000
  -SIMULATION:          	Simulation
	table, output
  -I_MAX:            	Interception Capacity
	floating point number
	Minimum: 0.000000
	Default: 2.000000
  -LAI_MIN:          	Minimum LAI
	floating point number
	Minimum: 0.000000
	Default: 0.100000
  -LAI_MAX:          	Maximum LAI
	floating point number
	Minimum: 0.000000
	Default: 4.000000
  -LITTER_MAX:       	Litter Capacity
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -LITTER_CF:        	Litter Drying Factor
	floating point number
	Minimum: 0.000000
	Default: 3.000000
  -LITTER_0:         	Initial Litter Water Content
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -GLUGLA:           	Glugla Coefficient
	floating point number
	Minimum: 0.000000
	Default: 150.000000
  -DO_ROOTING:          	Rooting
	boolean
	Default: 0
  -OUTPUT_UNIT:         	Output Unit
	choice
	Available Choices:
	[0] mm
	[1] vol.%
	[2] percent of field capacity
	Default: 0
  -SOIL_LAYERS:         	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