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
- 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 PDF (unpublished english translation).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 | 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 | 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 | GLUGLA_DEFAULT | default value if no grid has been selected | Minimum: 0.000000 Default: 150.000000 | |
| Interception Capacity | Floating point | I_MAX | Leaf interception capacity [mm] at maximum LAI. | Minimum: 0.000000 Default: 0.000000 | |
| 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 | |
| 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 | |
| (*) 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 Minimum: 0.000000 Default: 0.000000 -GLUGLA:<str> Glugla Coefficient Grid, input, optional -GLUGLA_DEFAULT:<double> Default Floating point 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 Minimum: 0.000000 Default: 0.000000 -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 -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