GGU-CONTAM-FE: "Soil properties" menu item
After going to this menu item, a system-specific dialog box opens allowing input of the soil properties. The steady-state property neff imported from the GGU-2D-SSFLOW program can no longer be amended here
In the example above, three soils have been defined for the system (groundwater modelling with GGU-2D-SSFLOW). Enter the soil parameters relevant to contaminant transport in the input boxes:
"Info"
This menu item provides some information on the meaning of the properties and their units. Take care to always use the same units, as these are not pre-specified by the program. The result will be given in terms of the units with which you entered your data."alph_l"
Enter the value of the longitudinal dispersivity alph_l. This is a function of grain size and varies between a few centimetres (laboratory tests in sand) and over 100 metres (jointed rocks)."alph_t"
The transversal dispersivity alph_t is generally a magnitude smaller than the longitudinal. In field tests, ratios around 0.01 were determined. Values of up to 0.3 are given in the literature."Dm"
Enter the value of the diffusion coefficient Dm. This value only influences contaminant distribution at very low flow velocities. For water at 10°C, this value is 10-9 m/s²."Sorp"
Enter the value of the sorption constant sorp. The sorption constant is dimensionless and is the product of grain density and the adsorption coefficient."lambda"
Enter the value of the decay constant lambda.