Tiwary et al. (2014), hydraulic PTFs for two major soil regions of India.¶
Source¶
Tiwary, P., Patil, N. G., Bhattacharyya, T., Chandran, P., Ray, S. K., Karthikeyan, K., ... & Thakre, S. (2014). Pedotransfer functions: a tool for estimating hydraulic properties of two major soil types of India. Current Science, 1431-1439.
Scope¶
Territory: Indo-Gangetic Plains and black soil region of India
Dataset: 209 layers from 30 Indo-Gangetic Plains profiles and 275 layers from 62 black-soil profiles; equation-specific subsets are described below.
Functions¶
calc_ptf_tiwary2014_igp¶
Estimate saturated conductivity for Indo-Gangetic Plains soils.
Status: implemented
Prediction target: Saturated hydraulic conductivity.
Models: \(k(h)\) — Saturated hydraulic conductivity
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | — | Sand content. |
bulk_density | number | Mg/m^3 | value > 0 | Bulk density. |
esp | number | % | — | Exchangeable sodium percentage. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
k_sat | m/s | — | Saturated hydraulic conductivity converted from mm/h. |
Note
Equation 11 was calibrated on 100 layers from 20 Indo-Gangetic Plains profiles.
Warning
The legacy API's three water-retention outputs are intentionally excluded because the source defines them only for BSR soils.
calc_ptf_tiwary2014_bsr¶
Estimate water retention and saturated conductivity for the black soil region.
Status: implemented
Prediction target: Gravimetric water contents at 33, 100, and 1500 kPa and saturated hydraulic conductivity.
Models: \(h(\theta)\) — Point water-retention estimates; \(k(h)\) — Saturated hydraulic conductivity
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
clay | number | % | — | Clay content. |
ph | number | dimensionless | value > 0 | Soil pH. |
cation_exchange_capacity | number | cmol(c)/kg | — | Cation exchange capacity. |
esp | number | % | — | Exchangeable sodium percentage. |
emp | number | % | — | Exchangeable magnesium percentage. |
excm | number | dimensionless | — | Exchangeable calcium-to-magnesium ratio. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
w_33 | % | — | Gravimetric water content at 33 kPa. |
w_100 | % | — | Gravimetric water content at 100 kPa. |
w_1500 | % | — | Gravimetric water content at 1500 kPa. |
k_sat | m/s | — | Saturated hydraulic conductivity converted from mm/h. |
Note
Water-retention equations used 75 layers from 14 profiles; equation 10 used 200 layers from 46 profiles.