hydpar_hypres: Mualem - van Genuchten Parameters from regression functions...

Description Usage Arguments Value References Examples

View source: R/ptf_hypres_regr.R

Description

Derives the Mualem - van Genuchten parameters ThetaR, ThetaS, Alpha, n, Tort and Ksat from sand, silt, clay, bulk density, organic carbon content values

Usage

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hydpar_hypres(clay, silt, bd, oc.pct = 0.1, topsoil = TRUE,
  humconv = 1.72)

Arguments

clay

clay mass percent

silt

silt mass percent

bd

bulk density in g cm-3

oc.pct

organic carbon content in mass percent

topsoil

Is the sample from the topsoil?

humconv

conversion factor oc.pct to organic matter percent

Value

A data.frame with the number of rows equal to length(clay) The data.frame contains the following variables:

ths

Saturation water content fraction

thr

Residual water content fraction

alpha

Alpha parameter of van Genuchten water retention function, m-1

npar

N parameter of van Genuchten water retention function

mpar

M parameter of van Genuchten water retention function

ksat

Saturated hyraulic conductivity parameter of Mualem hydraulic conductivity function, mm d-1

tort

Tortuosity parameter of Mualem hydraulic conductivity function

References

Woesten JHM, Lilly A, Nemes A, Le Bas C (1999) Development and use of a database of hydraulic properties of European soils. Geoderma 90, pp. 169-185

Examples

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hydpar_hypres(20,20,1.5,2)

pschmidtwalter/brook90r documentation built on Sept. 26, 2018, 5:17 p.m.