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 Hoermann (1998), "...covering the lowest, serious end of hydrologic computing".
| Name | Type | Identifier | Description | Constraints |
Input | Precipitation | Grid list, input | P | [mm] | - |
Potential Evapotranspiration | Grid list, input | ETP | [mm] | - |
Leaf Area Index (*) | Grid, input, optional | LAI | - | - |
Glugla Coefficient (*) | Grid, input, optional | GLUGLA | Empirical parameter [mm/day], depends on soil texture and structure. | - |
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] | - |
Output | Soil Water Content | Grid list, output | SOIL_WATER | [mm] | - |
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 |
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] Depth - 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
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(*) optional |