Skip to content

Feat/add gunarathna #74

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
mentaljam merged 1 commit into from
Sep 11, 2026
Merged

Feat/add gunarathna #74

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
398 changes: 398 additions & 0 deletions docs/src/ptf-catalog/sources/gunarathna2019.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,398 @@
---
# @generated by ptfkit-codegen; DO NOT EDIT.

title: PTF source gunarathna2019
nav-title: 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](https://doi.org/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.
Loading