Cosby et al. (1984), United States.¶
Source¶
Cosby, B. J., Hornberger, G. M., Clapp, R. B., & Ginn, T. R. (1984). A statistical exploration of the relationships of soil moisture characteristics to the physical properties of soils. Water Resources Research, 20(6), 682-690.
Scope¶
Territory: United States
Dataset: 1448 soil samples from Holtan et al. (1968) and Rawls et al. (1976).
Functions¶
calc_ptf_cosby1984_univariate¶
Estimate Cosby et al. (1984) univariate hydraulic parameter statistics from soil texture.
Status: implemented
Prediction target: Mean and standard deviation estimates for hydraulic parameters from sand, silt, and clay percentages.
Models: \(h(\theta)\) — Power function moisture characteristic; \(k(h)\) — Saturated hydraulic conductivity parameter statistics
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | 0 <= value <= 100 | Sand content. |
silt | number | % | 0 <= value <= 100 | Silt content. |
clay | number | % | 0 <= value <= 100 | Clay content. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
mean_b | dimensionless | — | Mean slope of the moisture characteristic. |
mean_log_psi_s | reported log value | — | Mean log saturation matric potential; the underlying potential is expressed in cm H2O. |
mean_log_k_sat | reported log value | — | Mean log saturated hydraulic conductivity; the underlying conductivity is expressed in inches per hour. |
mean_theta_s | % volume/volume | — | Mean saturated water content. |
sd_b | dimensionless | — | Standard deviation of b. |
sd_log_k_sat | reported log value | — | Standard deviation of log saturated hydraulic conductivity. |
sd_theta_s | % volume/volume | — | Standard deviation of saturated water content. |
Note
No back-transform is applied to logarithmic outputs.
Note
Public API names are provisional for pilot testing.
Warning
Log-transformed output units use the pilot contract reported log value.