The hysteretic nature of
soil water characteristic curve (SWCC) is captured assuming the virgin drying
and virgin wetting (a.k.a. imbibition) curves; which can be obtained from
experiments or various fitting equations in the literature, bound all possible
values during transition from one regime to the other. The scanning curves
(transitions between virgin wetting and drying SWCC) are modelled by using
geometry-based relations, which are devised by means of the observations on the
shapes of graphs of experimental data found in the literature. The proposed
relations can be used in incremental form to predict suction in different
frameworks (e.g. infiltration, evaporation) and related physical problems. An
empirical equation is proposed for power parameter (K), which is introduced in the relations. Only virgin wetting and
virgin drying SWCCs and regime reversal point suffice to model a scanning curve
in the developed formulations.

Anahtar Kelimeler:
## Soil-water characteristic curve, retention curve, scanning curve, hysteresis

The hysteretic nature of
soil water characteristic curve (SWCC) is captured assuming the virgin drying
and virgin wetting (a.k.a. imbibition) curves; which can be obtained from
experiments or various fitting equations in the literature, bound all possible
values during transition from one regime to the other. The scanning curves
(transitions between virgin wetting and drying SWCC) are modelled by using
geometry-based relations, which are devised by means of the observations on the
shapes of graphs of experimental data found in the literature. The proposed
relations can be used in incremental form to predict suction in different
frameworks (e.g. infiltration, evaporation) and related physical problems. An
empirical equation is proposed for power parameter (K), which is introduced in the relations. Only virgin wetting and
virgin drying SWCCs and regime reversal point suffice to model a scanning curve
in the developed formulations.

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- [7] Li, X.S. "Modelling of hysteresis response for arbitrary wetting/drying paths". Computers and Geotechnics, 32(2): 133-137, (2005).
- [8] Pedroso, D.M., and Williams, D.J. "A novel approach for modelling soil- water characteristic curves with hysteresis". Computers and Geotechnics, 37(3): 374-380, (2010).
- [9] Van Genuchten, M.T. "A closed-form equation for predicting the hydraulic conductivity of unsaturated soils", Soil Sci. Soc. Am. J. 44: 892-898 ,(1980).
- [10] Lins, Y., Zou, Y., and Schanz, T. "Physical modelling of SWCC for granular materials". Theoretical and numerical unsaturated soil mechanics, Weimar, Germany, 61-74, (2007).
- [11] Talsma, T. "Hysteresis in two sands and the independent domain model". Water Resources Research 6(3): 964-970, (1970).
- [12] Poulovassilis, A., and Childs, E.C. "The hysteresis of pore water: The non- indepence of domains". Journal of Soil Science, 112(5): 301-312, (1971).
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- [15] Haverkamp, R., Arrue, J.L., and Soet, M. "Soil physical properties within the root zone of the vine area of Tomelloso". Local and spatial standpoint, In Final integrated report of EFEDA II (European Field Experiment in a Desertification Area) Spain, Ed. J. F. Santa Olalla, CEE project n° CT920092, Brussels, chapter 3, (1997).
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- [18] Chen, P., Wei, C. F., and Ma, T. T. (2015). “Analytical model of soil-water characteristics considering the effect of air entrapment.” Int. J. Geomech., 10.1061/(ASCE)GM.

**ISSN:**1302-0900**Yayın Aralığı:**6**Başlangıç:**1998**Yayıncı:**GAZİ ÜNİVERSİTESİ

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