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Soil hydraulic models in SWRC Fit

In SWRC Fit (Web interface and offline version), 6 hydraulic models are used. Out of the 6 models, 4 models (BC, VG, LN, FX) assume unimodal pore structure (unimodal model) and 2 models (DB, BL) assume bimodal pore structure (bimodal model).

BCBrooks and Corey (1964)[[ S_e = \begin{cases}\left(\dfrac{h}{h_b}\right)^{-\lambda} & (h>h_b) \\ 1 & (h \le h_b)\end{cases} ]]$\theta_s, \theta_r, h_b, \lambda$
VGvan Genuchten (1980)[[ S_e = \biggl[\dfrac{1}{1+(\alpha h)^n}\biggr]^m ~~ (m=1-1/n) ]]$\theta_s, \theta_r, \alpha, n$
LNKosugi (1996)[[ S_e = Q \biggl[\dfrac{\ln(h/h_m)}{\sigma}\biggr] ]] $\theta_s, \theta_r, h, \sigma$
FXFredlund and Xing (1994)[[ S_e = C(h)\biggl[ \dfrac{1}{\ln \left[e+(h / a)^n \right]} \biggr]^m ]] $\theta_s, \theta_r, a, m, n$
DBDurner (1994)[[ S_e = w_1\biggl[\dfrac{1}{1+(\alpha_1 h)^{n_1}}\biggr]^{m_1} + (1-w_1)\biggl[\dfrac{1}{1+(\alpha_2 h)^{n_2}}\biggr]^{m_2} ]] $(m_i=1-1/n_i)$ $\theta_s, \theta_r, w_1, \alpha_1, n_1, \alpha_2, n_2$
BLSeki (2007)[[ S_e = w_1 Q \biggl[\dfrac{\ln(h/h_{m_1})}{\sigma_1}\biggr] + (1-w_1) Q \biggl[\dfrac{\ln(h/h_{m_2})}{\sigma_2}\biggr] ]] $\theta_s, \theta_r, w_1, h_{m_1}, \sigma_1, h_{m_2}, \sigma_2$


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Author: Katsutoshi Seki