SShorton: A Horton water infiltration model

Description Usage Arguments Details Value Author(s) References See Also Examples

Description

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

Usage

1
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

1
2
3
4
data(infilt)
infil=infilt[319:751,]
hort.lis=nlsList(log(Rate)~SShorton(Time,fc,f0,lrk)|PlotNo, infil)#Rate is the y variable
hort.lis

Example output

Loading required package: nlme
Loading required package: minpack.lm
Call:
  Model: log(Rate) ~ SShorton(Time, fc, f0, lrk) | PlotNo 
   Data: infil 

Coefficients:
              fc          f0       lrk
10lP3 -0.9153907  0.13781723 -3.876554
11lP3 -1.7154045  0.53727718 -1.478821
12lP3 -1.7129868 -0.16101421 -2.263245
13lP3 -0.8807472  0.87988152 -3.286569
14lP3 -1.6002645 -0.14289286 -2.917236
15lP3 -3.1202122 -1.16888432 -2.266679
16lP3 -1.4236167 -0.02887788 -2.154910
17lP3 -2.2444317 -0.50861849 -2.676427
18lP3 -1.2974485  0.09430572 -3.711095
19lP3 -1.6692989  0.38275627 -2.651548
20lP3 -2.3969585  0.43636555 -2.607348

Degrees of freedom: 433 total; 400 residual
Residual standard error: 0.2658178

HydroMe documentation built on May 29, 2017, 2:58 p.m.

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