jaky: R optmisation of Jaky particle size distribution function

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

Description

The function optimises parameters of Jaky(1944) particle size distribution function

Usage

jaky(data = NULL, D = NULL, fr = NULL, j = 1, p = NULL,
  group = NULL)

## Default S3 method:
jaky(data = NULL, D = NULL, fr = NULL, j = 1,
  p = NULL, group = NULL)

## S3 method for class 'jaky'
plot(x, main = "Particle Size Distribution Function",
  xlab = "Particle Diameter", ylab = "Fraction", ...)

## S3 method for class 'jaky'
coef(object, ...)

## S3 method for class 'jaky'
predict(object, D, ...)

Arguments

data	dataframe. It can contain data with column names of "time" and "I"
D	character. The corresponding diameter in the data.
fr	character. The corresponding fraction of the particles.
j	initial value of j parameter to be optimised
p	porosity[g/m^3]
group	character. The name of the group variables if the data is from different areas.
x	a return object of the function.
main	Title of the plot
xlab	x label of the plot
ylab	y label of the plot
...	Any other graphical parameter
object	Model output object

Value

• PD: predicted fraction by mass of particles passing a particular diameter

• D10: The diameter at which 10 per cent of the sample mass comprised of smaller particles

• D60: The diameter at which 60 per cent of the sample mass comprised of smaller particles

• sand: percentage of sand

• clay: percentage of clay

• silt: percentage of silt

• j: optimised j parameter

Author(s)

George Owusu

References

Jaky, J. (1944). Soil mechanics. (In Hungarian). Budapest: Egyetemi Nyomda.

See Also

zhuang3, zhuang4,lass3,logarithmic, logistic2, logistic3,fredlund3,fredlund4, jaky,andersson,gompertz, haverkamp

Examples

data=read.csv(system.file("ext","sys","soil2.csv",package="vadose"))
single<- subset(data, ID=="30B20_1")
mod=jaky (data=single,p="sand",D="D",fr="Sand.")
plot(mod)

#group simulation
mod2=jaky (data=data,D="D",fr="FractionSand",group="ID")
mod2$coef
#generic function

#input function ############################################

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