Soil data¶
Soil layers¶
Soil layer thickness is globally defined with the parameter i_delz, or in the file soilprofile.par for each soil layer separately. The sum of the soil layers need to be equal to the topographical parameter i_cz (maximum elevation). The VOM will raise a warning and correct i_cz if this is not the case. The river bed level i_zr needs to align with the soil layers. Also here, the VOM will give a warning and correct i_zr if needed.
Soil properties¶
Soil water retention and hydraulic conductivity parameters for 12 major soil textural groups according to [1]. Some units of the parameters (alpha and Ksat) are converted for the use in the VOM.
Texture | theta-r | theta-s | alpha (1/m) | n | K-sat (m/s) |
Sand | 0.045 | 0.43 | 14.5 | 2.68 | 8.25*10-5 |
Loamy Sand | 0.057 | 0.41 | 12.4 | 2.28 | 4.053*10-5 |
Sandy Loam | 0.065 | 0.41 | 7.5 | 1.89 | 1.228*10-5 |
Loam | 0.078 | 0.43 | 3.6 | 1.56 | 2.889*10-6 |
Silt | 0.034 | 0.46 | 1.6 | 1.37 | 6.944*10-7 |
Silt Loam | 0.067 | 0.45 | 2.0 | 1.41 | 1.25*10-6 |
Sandy Clay Loam | 0.100 | 0.39 | 5.9 | 1.48 | 3.639*10-6 |
Clay Loam | 0.095 | 0.41 | 1.9 | 1.31 | 7.222*10-7 |
Silty Clay Loam | 0.089 | 0.43 | 1.0 | 1.23 | 1.944*10-7 |
Sandy Clay | 0.100 | 0.38 | 2.7 | 1.23 | 3.333*10-7 |
Silty Clay | 0.070 | 0.36 | 0.5 | 1.09 | 5.555*10-8 |
Clay | 0.068 | 0.38 | 0.8 | 1.09 | 5.555*10-7 |
[1] | Carsel, R.F. & R.S.Parrish (1988): Developing joint probability distributions of soil water retention characteristics.-Water Resource Research 24:755-769. |