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Gallipoli Model

The Gallipoli model1 is an extension of the van Genuchten model2 to account for the influence of the void ratio on the Soil-Water Retention Curve (SWRC). The numgeo keyword reads:

*Hydraulic = Gallipoli [, Swr = ]
phi, psi, n, m

The material parameters of the Gallipoli model are given in the following.

  • \(\phi\) is an empirical parameter with units of inverse pressure (e.g., kPa\(^{-1}\)).
  • \(\psi\) and \(m\) are soil constants (dimensionless). \(m\) is often related to \(n\) via \(m=1-1/n\).
  • \(n > 1\) is an empirical parameter related to the pore-size distribution (dimensionless).

  1. D. Gallipoli, S. J. Wheeler, and M. Karstunen. Modelling the variation of degree of saturation in a deformable unsaturated soil. Géotechnique, 53(1):105–112, 2003-02. doi:10.1680/geot.2003.53.1.105. ↩

  2. M. Th. van Genuchten. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Science Society of America Journal, 44(5):892–898, 1980. URL: http://doi.wiley.com/10.2136/sssaj1980.03615995004400050002x (visited on 2022-04-07), doi:10.2136/sssaj1980.03615995004400050002x. ↩