Interactive Estimation of van Genuchten's (1980) Model Parameters
An interactive graphical adjustment of the soil water retention curve via van Genuchten's (1980) formula. The nonlinear least-squares estimates can be achieved taking the graphical initial values.
a numeric vector containing the values of soil water content.
a numeric vector containing the matric potential values.
a label for the x axis; if is NULL, the label "Matric potential" is used.
a label for the y axis; if is NULL, the label "Soil water content" is used.
further graphical arguments; see
A plot of
x and the curve of the current fitted model
according to the adjusted parameters in an external interactive panel.
Pressing the button "NLS estimates" a
nls summary of the
fitted model is printed on console whether convergence is achieved, otherwise
a warning box of "No convergence" is shown.
Anderson Rodrigo da Silva <firstname.lastname@example.org>
Genuchten, M. T. van. (1980). A closed form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Science Society of America Journal, 44:892-898.
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