Sat_old {SoilHyP}

Capillary saturation function

Description

Capillary saturation function of van Genuchten for unimodal or bimodal pore space distributions.

Usage

Sat_old(suc, par.shp, modality = c("uni"), suc.negativ = TRUE)

Arguments

suc

Suction/pressure heads. Negative if suc.negativ = TRUE

par.shp

named parameter in list or vector

modality

pore size distribution ('uni' or 'bi')

suc.negativ

set TRUE if suction/pressure heads are negative and FALSE if positive

Details

par.shp:

alfa [1/L]: van Genuchten shape parameter
n [-]: van Genuchten shape parameter
m [-]: shape parameter (m = 1-(1/n) if missing)

par.shp (additional for bimodal (modality = 'bi')):

w2 [-]: weigthing between pore space distribution
alfa2 [1/L]: van Genuchten parameter alfa for second pore space distribution
n2 [-]: van Genuchten parameter n for second pore space distribution

References

Van Genuchten, M. T. (1980). A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil science society of America journal, 44(5), 892-898.

Durner, W. (1994). Hydraulic conductivity estimation for soils with heterogeneous pore structure. Water Resources Research, 30(2), 211-223.