Soil Water Simulation after Glugla (Grid)
| Author(s) | O.Conrad (c) 2020 |
| Library ID | sim_hydrology |
| Tool ID | 11 |
| Version | 1.0 |
| 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 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 PDF (unpublished english translation)
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.%] | - |
| Maximum 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: Maximum 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