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ptfkit.tiwary2014

import ptfkit.tiwary2014;

Exported namespace: ptfkit::tiwary2014

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.

PTF catalog page

Tiwary2014PTFResult

struct Tiwary2014PTFResult {
    double w_33;
    double w_100;
    double w_1500;
    double k_sat;
};
Field 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 Saturated hydraulic conductivity converted from mm/h. (m/s)

Functions

calc_ptf_tiwary2014_igp

Estimate saturated conductivity for Indo-Gangetic Plains soils.

[[nodiscard]]
inline double calc_ptf_tiwary2014_igp(double sand, double bulk_density, double esp)

Parameters

Name Description
sand Sand content. (%)
bulk_density Bulk density. (Mg/m^3)
esp Exchangeable sodium percentage. (%)

Returns

Saturated hydraulic conductivity converted from mm/h. (m/s)

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.

[[nodiscard]]
inline Tiwary2014PTFResult calc_ptf_tiwary2014_bsr(double clay, double ph, double cation_exchange_capacity, double esp, double emp, double excm)

Parameters

Name Description
clay Clay content. (%)
ph Soil pH. (dimensionless)
cation_exchange_capacity Cation exchange capacity. (cmol(c)/kg)
esp Exchangeable sodium percentage. (%)
emp Exchangeable magnesium percentage. (%)
excm Exchangeable calcium-to-magnesium ratio. (dimensionless)

Returns

A Tiwary2014PTFResult value.

Note

Water-retention equations used 75 layers from 14 profiles; equation 10 used 200 layers from 46 profiles.