SShorton {HydroMe}

A Horton water infiltration model

Description

This is a three- parameter function to determine water infiltration parameters contained in the Horrton infiltration model

Usage

SShorton(input, fc, f0, lrk)

Arguments

input

Time

fc

Steady infiltration rate

f0

Initial infiltration rate

lrk

Shape factor related to soil pore continuity

Details

This is a self-starting model for estimating parameters in the Horton infiltration model using instantaneous infiltration rates (here known as Rate) and time data (Time)

Value

A list of objects returned by standard R regression functions such as nls and lm

Author(s)

Christian Thine Omuto

References

Horton RE. 1940. An approach towards a physical interpretation of infiltration capacity. Soil Science Society of America Proceedings 5: 227-237

See Also

SSphilip, SSgampt

Examples

data(infilt)
infil <- infilt[319:751,]
library(nlme)
hort.lis <- nlsList(log(Rate) ~ SShorton(Time,fc,f0,lrk) | PlotNo,
                    infil) # Rate is the y variable
hort.lis