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 | 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 | INPUT_LAI_DEFAULT | default value if no attribute has been selected | Default: 0.000000 |
Interception Capacity | Floating point | I_MAX | Leaf interception capacity [mm] at maximum LAI. | Minimum: 0.000000 Default: 2.000000 |
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 |
Glugla Coefficient | Floating point | GLUGLA | Empirical parameter [mm/day], depends on soil texture and structure. | Minimum: 0.000000 Default: 150.000000 |
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 |