Weber et al. (2020), compiled international soil hydraulic data.¶
Source¶
Weber, T. K. D., Finkel, M., da Conceicao Goncalves, M., Vereecken, H., & Diamantopoulos, E. (2020). Pedotransfer function for the Brunswick soil hydraulic property model and comparison to the van Genuchten-Mualem model. Water Resources Research, 56, e2019WR026820.
Scope¶
Territory: Portuguese, German, UNSODA, and Vereecken soil data collections
Dataset: A compilation of 1,729 samples with water-retention and hydraulic-conductivity data; regression data set DS1 contained 392 of the 402 retained samples, DS2 was used for tau, DS3 contained 359 samples for K_snc, and 10 samples were held out as DS4.
Functions¶
calc_ptf_weber2020¶
Convert VGM parameters to Brunswick-VGM parameters.
Status: implemented
Prediction target: Seven Brunswick-VGM soil hydraulic model parameters from six VGM parameters.
Models: \(h(\theta)\) — Brunswick model with the van Genuchten capillary saturation function; \(k(h)\) — Brunswick capillary, noncapillary, and isothermal vapor conductivity model
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
theta_r_vgm | number | dimensionless | 0.001 <= value <= 0.35 | VGM residual volumetric water content. |
theta_s_vgm | number | dimensionless | 0.2 <= value <= 0.7 | VGM saturated volumetric water content. |
alpha_vgm | number | cm^-1 | 0.001 <= value <= 0.1 | VGM inverse pressure-head scale parameter. |
n_vgm | number | dimensionless | 1.1 <= value <= 11 | VGM pore-size distribution shape parameter. |
tau_vgm | number | dimensionless | -2 <= value <= 10 | VGM hydraulic-conductivity shape parameter. |
k_s_vgm | number | cm d^-1 | 1 <= value <= 1000 | VGM saturated hydraulic conductivity. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_snc_bw | dimensionless | — | Saturated water content of the Brunswick noncapillary pore space. |
theta_sc_bw | dimensionless | — | Saturated water content of the Brunswick capillary pore space. |
alpha_bw | cm^-1 | — | Brunswick-VGM inverse pressure-head scale parameter. |
n_bw | dimensionless | — | Brunswick-VGM pore-size distribution shape parameter. |
tau_bw | dimensionless | — | Brunswick capillary hydraulic-conductivity shape parameter. |
k_sc_bw | cm d^-1 | — | Saturated capillary hydraulic conductivity. |
k_snc_bw | cm d^-1 | — | Saturated noncapillary hydraulic conductivity. |
Note
Regression coefficients are the York-regression estimates in Table 3; parenthesized standard errors are not part of the prediction.
Note
Input domains reproduce the parameter-estimation bounds in Table 1 and are not stated as a validated application domain.
Note
The source recommends the median K_snc value as a provisional parsimonious estimate requiring further research.
Warning
The DS2 inequality is treated as a source typographical error; the tau regression is interpreted as being based on nonpositive tau_vgm values.