This package is version 2 of HydroMe v.1 package. It estimates the parameters in infiltration and water retention models by curve-fitting method. The models considered are those that are commonly used in soil science. It has new models for water retention characteristic curve and debugging of errors in HydroMe v.1
The package contains hydraulic functions whose parameters are estimated from experimental data. The functions are supposed to be specified, the input data, and associated parameters declared in a standard regression modelling fashion. Where starting variables are needed, the package has a function known as Dstart for determining the starting variables
Christian Thine Omuto
Maintainer: Christian Thine Omuto <firstname.lastname@example.org>
Omuto CT and Gumbe LO. 2009. Estimating water infiltration and retention characteristics using a computer program in R. Computers and Geosciences 35: 579-585
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data(infilt) require("minpack.lm") gamp.ns <- nlsLM(Rate ~ SSgampt(Time,ks,A), infilt) summary(gamp.ns) data(isric) isric1 <- isric[1:32,] require("nlme") omuto <- nlsList(y~SSomuto(x,ths1,alp1,ths2,alp2)|Sample, isric1) omuto.nlme <- nlme(omuto)## for fitting mixed-effects models summary(omuto.nlme)
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