Soil Water Simulation after Glugla (Grid)

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 PDF (unpublished english translation).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	Precipitation	grid list, input	`P`	[mm]	-
	Potential Evapotranspiration	grid list, input	`ETP`	[mm]	-
	Field Capacity	grid list, input, optional	`FC`	[vol.%]	-
	Permanent Wilting Point	grid list, input, optional	`PWP`	[vol.%]	-
	Maxmimum Evapotranspiration	grid list, input, optional	`ETMAX`	[vol.%/day]	-
	Leaf Area Index	grid, input, optional	`LAI`	-	-
	Glugla Coefficient	grid, input, optional	`GLUGLA`	Empirical parameter [mm/day], depends on soil texture and structure.	-
Output	Soil Water Content	grid list, output	`SOIL_WATER`	-	-
	Litter Water Content	grid, output	`LITTER`	[mm]	-
	Recharge	grid, output, optional	`RECHARGE`	[mm]	-
	Recharge Sum	grid, output, optional	`RECHARGE_SUM`	[mm]	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Grid system	grid system	`LAI_GRIDSYSTEM`	-	-
	Default	floating point number	`LAI_DEFAULT`	default value if no grid has been selected	Minimum: 0.000000 Default: 0.000000
	Grid system	grid system	`GLUGLA_GRIDSYSTEM`	-	-
	Default	floating point number	`GLUGLA_DEFAULT`	default value if no grid has been selected	Minimum: 0.000000 Default: 150.000000
	Interception Capacity	floating point number	`I_MAX`	Leaf interception capacity [mm] at maximum LAI.	Minimum: 0.000000 Default: 0.000000
	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
	Reset	boolean	`RESET`	-	Default: 1
	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: 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
	Update	boolean [GUI]	`UPDATE`	-	Default: 0
	Overwrite	boolean [GUI]	`OVERWRITE`	Overwrite soil water grids from previous simulations.	Default: 1

Command Line


Usage: saga_cmd sim_hydrology 11 [-P ] [-ETP ] [-FC ] [-PWP ] [-ETMAX ] [-LAI ] [-LAI_DEFAULT ] [-GLUGLA ] [-GLUGLA_DEFAULT ] [-SOIL_WATER ] [-LITTER ] [-RECHARGE ] [-RECHARGE_SUM ] [-I_MAX ] [-LAI_MIN ] [-LAI_MAX ] [-LITTER_MAX ] [-LITTER_CF ] [-LITTER_0 ] [-RESET ] [-DO_ROOTING ] [-OUTPUT_UNIT ] [-SOIL_LAYERS ]
  -P:                	Precipitation
	grid list, input
  -ETP:              	Potential Evapotranspiration
	grid list, input
  -FC:               	Field Capacity
	grid list, input, optional
  -PWP:              	Permanent Wilting Point
	grid list, input, optional
  -ETMAX:            	Maxmimum Evapotranspiration
	grid list, input, optional
  -LAI:              	Leaf Area Index
	grid, input, optional
  -LAI_DEFAULT:   	Default
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -GLUGLA:           	Glugla Coefficient
	grid, input, optional
  -GLUGLA_DEFAULT:	Default
	floating point number
	Minimum: 0.000000
	Default: 150.000000
  -SOIL_WATER:       	Soil Water Content
	grid list, output
  -LITTER:           	Litter Water Content
	grid, output
  -RECHARGE:         	Recharge
	grid, output, optional
  -RECHARGE_SUM:     	Recharge Sum
	grid, output, optional
  -I_MAX:         	Interception Capacity
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -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
  -RESET:            	Reset
	boolean
	Default: 1
  -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