Soil parameterization
To develop soil parameterization file, first the depth of the different soil horizons and texture (combination of soil, silt and clay) in percentage is required. This information is general available in soil dataset. The texture information is useful to describe the characteristics of soil water retention curve. The soil texture information (in percentage) is provided as input data to the software component ROsetta inside 'HYDRUS ID' to understand pedotransfer functions of soils in three different hypothetical pressure scenarios. They are: 0 mbar, 60 mbar and 15,000 mbar. The soil texture is classified according to the specific pore volumes of soil (Scheffer and Schachtschabel 1984).
For example, a soil type A has following depth and texture combination:
| Parameter | Description width="85%" | Texture |
|---|---|
| SID | soil type ID |
| depth | thickness of soil |
| kf_min | minimum permeability coefficient |
| depth_min | depth of the horizon above the horizon with the smallest permeability coefficient |
| kf_max | maximum permeability coefficient |
| cap_rise | Boolean variable, that allows (1) or restricts (0) capillary ascension |
| aircap | air capacity |
| fc_sum | useable field capacity |
| fc_1 ...22 | useable field capacity per decimeter of profile depth |
