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.
Status: implemented
Prediction target: Volumetric water content at -10 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_10 | mm/mm | — | Volumetric water content at -10 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -10 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
silt | number | % | Table 1 observed range: 0.0 <= value <= 38.6 | Silt percentage measured by the pipette method. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_10 | mm/mm | — | Volumetric water content at -10 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -10 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
silt | number | % | Table 1 observed range: 0.0 <= value <= 38.6 | Silt percentage measured by the pipette method. |
bulk_density | number | g/cm3 | Table 1 observed range: 1.0 <= value <= 2.0 | Bulk density measured using undisturbed cores. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_10 | mm/mm | — | Volumetric water content at -10 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -10 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
silt | number | % | Table 1 observed range: 0.0 <= value <= 38.6 | Silt percentage measured by the pipette method. |
organic_carbon | number | % | Table 1 observed range: 0.0 <= value <= 4.5 | Organic carbon percentage measured by the Walkley-Black method. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_10 | mm/mm | — | Volumetric water content at -10 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -33 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_33 | mm/mm | — | Volumetric water content at -33 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -33 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
silt | number | % | Table 1 observed range: 0.0 <= value <= 38.6 | Silt percentage measured by the pipette method. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_33 | mm/mm | — | Volumetric water content at -33 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -33 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
silt | number | % | Table 1 observed range: 0.0 <= value <= 38.6 | Silt percentage measured by the pipette method. |
bulk_density | number | g/cm3 | Table 1 observed range: 1.0 <= value <= 2.0 | Bulk density measured using undisturbed cores. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_33 | mm/mm | — | Volumetric water content at -33 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -33 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
silt | number | % | Table 1 observed range: 0.0 <= value <= 38.6 | Silt percentage measured by the pipette method. |
organic_carbon | number | % | Table 1 observed range: 0.0 <= value <= 4.5 | Organic carbon percentage measured by the Walkley-Black method. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_33 | mm/mm | — | Volumetric water content at -33 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -1500 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_1500 | mm/mm | — | Volumetric water content at -1500 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -1500 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
bulk_density | number | g/cm3 | Table 1 observed range: 1.0 <= value <= 2.0 | Bulk density measured using undisturbed cores. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_1500 | mm/mm | — | Volumetric water content at -1500 kPa matric potential. |
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.
Status: implemented
Prediction target: Volumetric water content at -1500 kPa.
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | Table 1 observed range: 5.2 <= value <= 99.0 | Sand percentage measured by sieve analysis. |
organic_carbon | number | % | Table 1 observed range: 0.0 <= value <= 4.5 | Organic carbon percentage measured by the Walkley-Black method. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_1500 | mm/mm | — | Volumetric water content at -1500 kPa matric potential. |
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.