SSphilip: A Philip's water infiltration model

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

Description

This is a two- parameter function to determine water infiltration parameters contained in the Philip's infiltration model

Usage

1
SSphilip(input, fc, S)

Arguments

input

Time

fc

Steady infiltration rate

S

Sorptivity

Details

This is a self-starting model for estimating Philip's infiltration model using instantaneous infiltration rates (here known as Rate) and time (Time) data

Value

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

Author(s)

Christian Thine Omuto

References

Philip JR. 1957. The theory of infiltration.: 4 Sorptivity and algebraic infiltration equations. Soil Science 84: 257-264

See Also

SShorton, SSgampt

Examples

1
2
3
data(infilt)
philip.nis=nlsList(log(Rate)~SSphilip(Time,fc,S)|PlotNo, data=infilt)
coef(philip.nis)

Example output

Loading required package: nlme
Loading required package: minpack.lm
               fc         S
10lP3 -0.67115487  2.827428
11lP3 -2.15992579  4.885854
12lP3 -1.99641372  4.567819
13lP3 -0.66634649  4.357512
14lP3 -1.47015348  3.528538
15lP3 -3.46364018  5.583295
16lP3 -1.66034417  3.777089
17lP3 -2.69610774  7.682578
18lP3 -1.03551794  3.631941
19lP3 -1.76119791  5.298524
1lP3  -0.67465198  3.670444
20lP3 -2.77161858  8.484734
21lP3 -0.68879849  3.199272
22lP3 -4.67126000 16.126150
23lP3 -2.08733079  6.480040
24lP3 -1.70641863  4.436305
25lP3 -0.63368076  3.039162
26lP3 -1.15611998  3.791271
27lP3 -1.39522456  3.472055
28lP3 -1.80424312  3.700359
29lP3 -2.73771203  4.737743
2lP3  -3.53801892  7.822798
30lP3 -0.94631012  2.941706
3lP3  -2.86424258  5.502755
4lP3  -0.03003324  3.407198
5lP3  -1.17015006  1.977462
6lP3  -1.31420048  3.783494
7lP3  -0.99433396  1.992016
8lP3  -1.77546450  3.182394
9lP3  -0.76364675  3.793935

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