Kfilm: Relative film conductivity

In SoilHyP: Soil Hydraulic Properties

Relative film conductivity

Description

Relative film conductivity described by Peters (2013).

Usage

Kfilm(suc, par.shp, modality = "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:

ths [-]: saturated water content
thr [-]: residual water content
alfa [1/L]: van Genuchten shape parameter
n [-]: van Genuchten shape parameter
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))
a: slope at the log scale (a = -1.5 if missing as suggested by Tokunaga (2009) and Peters (2013))

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

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. (2013). Simple consistent models for water retention and hydraulic conductivity in the complete moisture range. Water Resour. Res. 49, 6765–6780. physics-a review. Vadose Zone J. http://dx.doi.org/10.2136/vzj2012.0163.

Tokunaga, T. K. (2009). Hydraulic properties of adsorbed water films in unsaturated porous media. Water resources research, 45(6).

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.