Kcap: Relative capillary conductivity

In SoilHyP: Soil Hydraulic Properties

Relative capillary conductivity

Description

Relative capillary conductivity based on Mualem's conductivity model for unimodal or bimodal van Genuchten-Mualem.

Usage

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

Arguments

suc	Suction/pressure heads. Negative if suc.negativ = TRUE
par.shp	named parameter in list or vector
suc.negativ	set TRUE if suction/pressure heads are negative and FALSE if positive
modality	pore size distributions ('uni' or 'bi')

Details

par.shp:

alfa [1/L]: van Genuchten shape parameter
n [-]: van Genuchten shape parameter
m [-]: shape parameter (m = 1-(1/n) if missing)
tau [-]: tortuosity and connectivity parameter (minimum -1 or -2 for the PDI model; for details see Peters (2014))
h0 [L]: suction at water content of 0 (i.e. oven dryness) (h0 = 10^6.8 if missing, corresponding to oven dryness at 105°C (Schneider and Goss, 2012))

par.shp: additional parameter 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

Peters, A. (2014). Reply to comment by S. Iden and W. Durner on Simple consistent models for water retention and hydraulic conductivity in the complete moisture range. Water Resour. Res. 50, 7535–7539.

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.

Mualem, Y. (1976). A new model for predicting the hydraulic conductivity of unsaturated porous media. Water resources research, 12(3), 513-522.

Schneider, M., & Goss, K. U. (2012). Prediction of the water sorption isotherm in air dry soils. Geoderma, 170, 64-69.

See Also

Ku

SoilHyP documentation built on Feb. 16, 2023, 7:06 p.m.