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ptfkit.weber2020

import ptfkit.weber2020;

Exported namespace: ptfkit::weber2020

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.

DOI: 10.1029/2019WR026820

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.

PTF catalog page

Weber2020PTFResult

struct Weber2020PTFResult {
    double theta_snc_bw;
    double theta_sc_bw;
    double alpha_bw;
    double n_bw;
    double tau_bw;
    double k_sc_bw;
    double k_snc_bw;
};
Field Description
theta_snc_bw Saturated water content of the Brunswick noncapillary pore space. (dimensionless)
theta_sc_bw Saturated water content of the Brunswick capillary pore space. (dimensionless)
alpha_bw Brunswick-VGM inverse pressure-head scale parameter. (cm^-1)
n_bw Brunswick-VGM pore-size distribution shape parameter. (dimensionless)
tau_bw Brunswick capillary hydraulic-conductivity shape parameter. (dimensionless)
k_sc_bw Saturated capillary hydraulic conductivity. (cm d^-1)
k_snc_bw Saturated noncapillary hydraulic conductivity. (cm d^-1)

Functions

calc_ptf_weber2020

Convert VGM parameters to Brunswick-VGM parameters.

[[nodiscard]]
inline Weber2020PTFResult calc_ptf_weber2020(double theta_r_vgm, double theta_s_vgm, double alpha_vgm, double n_vgm, double tau_vgm, double k_s_vgm)

Parameters

Name Description
theta_r_vgm VGM residual volumetric water content. (dimensionless)
theta_s_vgm VGM saturated volumetric water content. (dimensionless)
alpha_vgm VGM inverse pressure-head scale parameter. (cm^-1)
n_vgm VGM pore-size distribution shape parameter. (dimensionless)
tau_vgm VGM hydraulic-conductivity shape parameter. (dimensionless)
k_s_vgm VGM saturated hydraulic conductivity. (cm d^-1)

Returns

A Weber2020PTFResult value.

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.