Determination of soil–water characteristic curve variables

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Quantification of uncertainties in soil-water characteristic curve associated with fitting parameters (2013, methodology): “…¼ ψb amax; nmax; mminð Þ; AEVmin ¼ ψb amin; nmin; mmaxð Þ; ð15Þ ψrmax ¼ ψr amax; nmin; mminð Þ;ψrmin ¼ ψr amin; nmax; mmaxð Þ; ð16Þ Where: ψb(a, n, m) and ψr(a, n, m) are the function for the determination of air-entry value and residual suction (Zhai and Rahardjo, 2012), respectively.”
Effects of residual suction and residual water content on the estimation of permeability function (2017, background): “Zhai and Rahardjo (2012a) demonstrated the geometrical relationship between these SWCC variables as illustrated in Figure 2.”
Estimation of air permeability function from soil-water characteristic curve (2015, methodology): “…(2) where: Cr = input value, can be a roughly estimated value for residual suction, Cr = 1500 kPa for most cases as suggested by Fredlund and Xing (1994) and Zhai and Rahardjo (2012a, 2012b); θ = volumetric water content; ψ = matric suction; e = Euler’s number and a, n and m = fitting…”