Soil parameterization
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Select model of “% Sand, Silt and Clay (SSC)”. | Select model of “% Sand, Silt and Clay (SSC)”. | ||
| − | Input the percentage of SSC. | + | Input the percentage of SSC in the window. In this example, the SSC of A-horizon from the table above is provided. |
[[File:texture_input2.png|soilType-A]] | [[File:texture_input2.png|soilType-A]] | ||
Revision as of 10:40, 8 August 2012
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 1D' 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:
| Horizon | Depth (cm) | Texture (Sand,Silt,Clay %) |
|---|---|---|
| A Horizon | 15 | texture (47, 39, 14 ) |
| B Horizon | 15 | texture (40, 42, 19 ) |
| C Horizon | 25 | texture (33, 40, 27 ) |
| D Horizon | 35 | texture (49, 33, 18 ) |
| E Horizon | 35 | texture (55, 32, 13 ) |
The texture information needs to be supplied to HYDRUS 1D software to get the water holding capacity of the specific texture combination:
- The HYDRUS 1D can be download from the following link: http://www.pc-progress.com/en/Default.aspx?hydrus-1d
- Click Hydrus-1D Downloads-->
- Download the latest version (In this tutorial, version Hydrus1D_4.15.0110 is downloaded)
- Open the software:
Click File--> New-->>
Give the name for the new project. For example: Soil type-A
Click OK
A new window with new project name will appear:
On pre-processing windows select the “Water Flow – Soil Hydraulic Parameters”
The new window will appear:
On this window, select the “Neural Network Prediction”.
A new window will appear:
Select model of “% Sand, Silt and Clay (SSC)”.
Input the percentage of SSC in the window. In this example, the SSC of A-horizon from the table above is provided.
Click ‘Predict’ and the Output will be resulted.
