modified.kostiakov: Smith modified kostiakov infiltration parameter optmisation...

In gowusu/vadose: The estimation of saturated hydraulic conductivity and soil water retention Curves in the vadose zone

Description

This function optimises Smith (1972) modified kostiakov cumulative infiltration (I)

Usage

modified.kostiakov(data = NULL, time, I, a = 0.1, k = 0.1, fc = 0.1,
  group = NULL)

## Default S3 method:
modified.kostiakov(data = NULL, time, I, a = 0.1,
  k = 0.1, fc = 0.1, group = NULL)

## S3 method for class 'modified.kostiakov'
predict(object, time = NULL, ...)

Arguments

data	dataframe. It can contain data with column names of "time" and "I"
time	character or numeric. The name of time variable in the dataframe. If the "data" parameter contains "time", this will be ignored. The unit must be in seconds.
I	cumulative infiltration (I) or infiltration rate (i) [mm]
a	constant
k	constant
fc	constant
group	character. The name of the group variables if the data is from different areas.
object	Model output object
...	Any other graphical parameter

Value

• a: optimised constant

• k: optimised constant

• fcoptimised constant

• output: output of the group simulation

Author(s)

George Owusu

References

Smith, R. E. (1972). The infiltration envelope: Results from a theoretical infiltrometer. J.Hydrol., 17, 1-21.

Examples

## Not run: 
data=read.csv(system.file("ext","sys","exampleBEST.csv",package="vadose"))
modified.kostiakov1<-modified.kostiakov(data=data,time="time",I="I")
#print(gof(modified.kostiakov1))
plot(modified.kostiakov1)
predict(modified.kostiakov1)
coef(modified.kostiakov1)
#gof(modified.kostiakov1)

#group simulation
data=read.csv(system.file("ext","sys","infiltration2.csv",package="vadose"))
assin_breko<- subset(data, ID=="41A20_1")
modified.kostiakov1vg<-modified.kostiakov(data=data,time="minutes",I="CumInfil",group="ID")
coef(modified.kostiakov1vg)

## End(Not run)

gowusu/vadose documentation built on May 17, 2019, 7:59 a.m.