Physics of the soil medium organization part 2: pedostructure characterization through measurement and modeling of the soil moisture characteristic curves

Assi, Amjad T.; Braudeau, Erik; Accola, Joshua Jonathan Oswald; Hovhannissian, Gaghik; Mohtar, Rabi H.

doi:10.3389/fenvs.2014.00005

Cited by 22 publications

(19 citation statements)

References 52 publications

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“…The tensiometric measurements were made on unconfined cylindrical soil samples reconstituted from 2 mmsieved soil material and using the TypoSoil® apparatus according to the methodology described in Assi et al (2014). The preparation of the sample, the measurement and the treatment of data to extract parameters of the water retention curve: E ma , E mi , W miSat and W maSat , of Equations (5) and (6) have been detailed in the article.…”

Section: Methodsmentioning

confidence: 99%

“…Parameters of the pedostructural water retention curve (W Sat , W miSat , E mi , E ma ) are then extracted from the measured water retention curve according to the methodology given in and detailed in Assi et al (2014) by adjustment of the theoretical equation h(W) to the measured curve. All calculations were done in Excel sheets, using the Excel solver for optimization of adjustments of the measured curve by the theoretical one.…”

Section: Methodsmentioning

confidence: 99%

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Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer

et al. 2014

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The pressure plate method is a standard method for measuring the pF curves, also called soil water retention curves, in a large soil moisture range from saturation to a dry state corresponding to an applied pressure of near 1500 kPa. However, the pressure plate can only provide discrete water retention curves represented by a dozen measured points. In contrast, the measurement of the soil water retention curves by tensiometer is direct and continuous, but limited to the range of the tensiometer reading: from saturation to near 70-80 kPa. The two methods stem from two very different concepts of measurement and the compatibility of both methods has never been demonstrated. The recently established thermodynamic formulation of the pedostructure water retention curve, will allow the compatibility of the two curves to be studied, both theoretically and experimentally. This constitutes the object of the present article. We found that the pressure plate method provides accurate measurement points of the pedostructure water retention curve h(W ), conceptually the same as that accurately measured by the tensiometer. However, contrarily to what is usually thought, h is not equal to the applied air pressure on the sample, but rather, is proportional to its logarithm, in agreement with the thermodynamic theory developed in the article. The pF curve and soil water retention curve, as well as their methods of measurement are unified in a same physical theory. It is the theory of the soil medium organization (pedostructure) and its interaction with water. We show also how the hydrostructural parameters of the theoretical curve equation can be estimated from any measured curve, whatever the method of measurement. An application example using published pF curves is given.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer

et al. 2014

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“…These four curves are dependent on the thermodynamic interaction between the water molecules and the surface charges of soil particles, both organic and mineral, constituting the non-rigid structure of the soil medium. The new apparatus, named TypoSoil® [12], which measures accurately and simultaneously in laboratory the two first hydrostructural characteristic curves of the pedostructure, namely, the shrinkage curve and the water retention curve, allowed us validating the theoretical equations of these curves [13,9,10]. It was recently put available on the market (2014).…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

Hydrostructural Pedology, New Scientific Discipline Allowing for Physical Modelling of ‘Green Water’ Dynamics in the Soil-Plant-Atmosphere System

Braudeau

Boukcim

Assi

et al. 2018

JAERI

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Using a new paradigm of soil characterization and modeling in agro environmental sciences, named hydrostructural pedology, we were able to show that the "green water" concept of agronomists corresponds exactly to the pedostructural water concept which was physically defined in this paradigm. The water in the pedostructure of soils is composed of two types of water, named micro and macro, nested one in the other. They are differentiated by their chemical potential related to their position in the pedostructure: inside primary aggregates or outside of them in the interpedal space. A fundamental physics of the pedostructural water could be developed within this new paradigm. Finally, the soil medium can now be considered as the location in which the free water (named also blue water), coming from surface (rainfall, irrigation, etc.) and going down by gravity through the macro pore space of the soil, is partially absorbed by the pedostructure, and becomes JAERI, 15(3): xxx-xxx, 2018; Article no.JAERI.43822 2 then the 'green water' of the soil. Soil green water is, in fact, the soil water reserve available to plant roots and subsequently transpired by the plants into the canopy. The soil-water model Kamel ® , built according to this new paradigm, is the only model able to physically simulate the opposite dynamic cycles of these two kinds of water (blue and green) within the soil-plantatmosphere system, their exchanges and equilibrium states according to time, at each depth of the pedon. Important implications about strategy of soil-water characterization, mapping and modeling are given for sustainable development and management of agricultural zones. Mini-review Article

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“…Equations (1) determine the hydrostructural and thermodynamic equilibrium states of any pedostructure SREV defined in a soil medium and under the controlled variables: T, P, W, and μ air . Braudeau et al (2014) and Assi et al (2014) could then show the two following points: (i) G wl , G wmi , and G wma stay constant with any change in water content, and (ii) at each equilibrium state depending of W, there is necessarily equality between the water retention inside and outside of primary peds, such that: h mi = h ma = h at any value of W at equilibrium. They could deduce then the physical equations of the pedostructural shrinkage curve and the water retention curve that will be presented in the next section.…”

Section: Structural Representative Elementary Volume (Srev) Of the Pementioning

confidence: 99%

A framework for soil-water modeling using the pedostructure and Structural Representative Elementary Volume (SREV) concepts

Braudeau

Mohtar

2014

Front. Environ. Sci.

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Physics of the soil medium organization part 2: pedostructure characterization through measurement and modeling of the soil moisture characteristic curves

Cited by 22 publications

References 52 publications

Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer

Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer

Hydrostructural Pedology, New Scientific Discipline Allowing for Physical Modelling of ‘Green Water’ Dynamics in the Soil-Plant-Atmosphere System

A framework for soil-water modeling using the pedostructure and Structural Representative Elementary Volume (SREV) concepts

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