Dtheta: Hydraulic diffusivity
In ilyamaclean/ecohydrotools: hydrogical modelling for ecological applications with R
Description
Usage
Arguments
Details
Value
See Also
Examples
Description
Dtheta calculates hydrualic diffusivity
Usage
1
Dtheta(sm, sp, timestep = 86400)
Arguments
sm
Soil water fraction
sp
a list of van Genuchten soil parameters as returned by getsoilparams()
timestep
number of seconds in each time step of model run (default one day)
Details
Applies the van Genuchten equation to estimate the hydrualic diffusivity
(van Genuchten 1980 Soil Science Society of America Journal 44:892-898).
Paramaters of the van Genuchten equation can be found in the dataset soilparams().
Ksat and the returned value are adjusted so that returned units are in cm per timestep.
Dtheta is contrained to be finite by ensuring that sm marginally less than Smax
when saturated and is assumed to be zero, when sm = Smin.
Value
Hydraulic conductivity (cm / time-step)
See Also
Examples
1
2
sm <- c(74:422) / 1000
plot(log(Dtheta(sm, getsoilparams("Loam")), 10) ~ sm)
ilyamaclean/ecohydrotools documentation built on June 10, 2019, 5:45 a.m.
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Description Usage Arguments Details Value See Also Examples
Description
Dtheta calculates hydrualic diffusivity
Usage
1 | Dtheta(sm, sp, timestep = 86400)
|
Arguments
sm |
Soil water fraction |
sp |
a list of van Genuchten soil parameters as returned by |
timestep |
number of seconds in each time step of model run (default one day) |
Details
Applies the van Genuchten equation to estimate the hydrualic diffusivity
(van Genuchten 1980 Soil Science Society of America Journal 44:892-898).
Paramaters of the van Genuchten equation can be found in the dataset soilparams().
Ksat and the returned value are adjusted so that returned units are in cm per timestep.
Dtheta is contrained to be finite by ensuring that sm marginally less than Smax
when saturated and is assumed to be zero, when sm = Smin.
Value
Hydraulic conductivity (cm / time-step)
See Also
Examples
1 2 | sm <- c(74:422) / 1000
plot(log(Dtheta(sm, getsoilparams("Loam")), 10) ~ sm)
|
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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