ptfkit.gunarathna2019¶
import ptfkit.gunarathna2019;
Exported namespace: ptfkit::gunarathna2019
Point water-retention regressions for tropical Sri Lankan soils.
Source¶
Gunarathna, M. H. J. P., Sakai, K., Nakandakari, T., Momii, K., Kumari, M. K. N., & Amarasekara, M. G. T. S. (2019). Pedotransfer functions to estimate hydraulic properties of tropical Sri Lankan soils. Soil & Tillage Research, 190, 109-119. https://doi.org/10.1016/j.still.2019.02.009
DOI: 10.1016/j.still.2019.02.009
Scope¶
Territory: Tropical Sri Lanka.
Dataset: 323 soil horizons retained after removing samples with missing water-content data from the SRI-CANSOL survey of 110 profiles. The survey covers almost all soil series and land uses except the northern part of Sri Lanka. Models were evaluated using tenfold cross-validation.
Functions¶
calc_ptf_gunarathna2019_vwc10_set1¶
Estimate volumetric water content at -10 kPa using Set 1.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc10_set1(double sand)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
Returns¶
Volumetric water content at -10 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC10, Set 1.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
Warning
Section 3.1 reports slight overprediction above 64% sand at this pressure.
calc_ptf_gunarathna2019_vwc10_set2¶
Estimate volumetric water content at -10 kPa using Set 2.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc10_set2(double sand, double silt)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
silt | Silt percentage measured by the pipette method. (%) |
Returns¶
Volumetric water content at -10 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC10, Set 2.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc10_set3¶
Estimate volumetric water content at -10 kPa using Set 3.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc10_set3(double sand, double silt, double bulk_density)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
silt | Silt percentage measured by the pipette method. (%) |
bulk_density | Bulk density measured using undisturbed cores. (g/cm3) |
Returns¶
Volumetric water content at -10 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC10, Set 3.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc10_set4¶
Estimate volumetric water content at -10 kPa using Set 4.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc10_set4(double sand, double silt, double organic_carbon)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
silt | Silt percentage measured by the pipette method. (%) |
organic_carbon | Organic carbon percentage measured by the Walkley-Black method. (%) |
Returns¶
Volumetric water content at -10 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC10, Set 4.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc33_set1¶
Estimate volumetric water content at -33 kPa using Set 1.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc33_set1(double sand)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
Returns¶
Volumetric water content at -33 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC33, Set 1.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
Warning
Section 3.1 reports slight overprediction above 66% sand at this pressure.
calc_ptf_gunarathna2019_vwc33_set2¶
Estimate volumetric water content at -33 kPa using Set 2.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc33_set2(double sand, double silt)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
silt | Silt percentage measured by the pipette method. (%) |
Returns¶
Volumetric water content at -33 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC33, Set 2.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc33_set3¶
Estimate volumetric water content at -33 kPa using Set 3.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc33_set3(double sand, double silt, double bulk_density)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
silt | Silt percentage measured by the pipette method. (%) |
bulk_density | Bulk density measured using undisturbed cores. (g/cm3) |
Returns¶
Volumetric water content at -33 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC33, Set 3.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc33_set4¶
Estimate volumetric water content at -33 kPa using Set 4.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc33_set4(double sand, double silt, double organic_carbon)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
silt | Silt percentage measured by the pipette method. (%) |
organic_carbon | Organic carbon percentage measured by the Walkley-Black method. (%) |
Returns¶
Volumetric water content at -33 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC33, Set 4.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc1500_set1¶
Estimate volumetric water content at -1500 kPa using Set 1.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc1500_set1(double sand)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
Returns¶
Volumetric water content at -1500 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC1500, Set 1.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
Warning
Section 3.1 reports slight overprediction above 66% sand at this pressure.
calc_ptf_gunarathna2019_vwc1500_set3¶
Estimate volumetric water content at -1500 kPa using Set 3.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc1500_set3(double sand, double bulk_density)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
bulk_density | Bulk density measured using undisturbed cores. (g/cm3) |
Returns¶
Volumetric water content at -1500 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC1500, Set 3.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.
calc_ptf_gunarathna2019_vwc1500_set4¶
Estimate volumetric water content at -1500 kPa using Set 4.
[[nodiscard]]
inline double calc_ptf_gunarathna2019_vwc1500_set4(double sand, double organic_carbon)
Parameters¶
| Name | Description |
|---|---|
sand | Sand percentage measured by sieve analysis. (%) |
organic_carbon | Organic carbon percentage measured by the Walkley-Black method. (%) |
Returns¶
Volumetric water content at -1500 kPa matric potential. (mm/mm)
Note
Equation evidence: Table 3, VWC1500, Set 4.
Note
Input ranges describe the study observations, not enforced validity limits.
Warning
Predictions are empirical and are not clipped to physical bounds.