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

Braudeau, Erik; Mohtar, Rabi H.

doi:10.3389/fenvs.2014.00024

Cited by 12 publications

(15 citation statements)

References 27 publications

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“…The use of the new hydro structural pedology paradigm allowed discovering the exact equations of state of the pedostructure that characterize the thermodynamic and hydrostructural equilibrium between the two types of pedostructural water (W mi and W ma , internal and external to primary peds in the pedostructure) [9]. This, in turn, led to the establishment of theoretical equations of the four pedostructural characteristic curves that fully represent the hydrostructural properties of soils [9,10] and [11]; these are:…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

“…• The pedostructural hydric conductivity curve, = (dm/s) as function of the pedostructural water content [11].…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

“…• The pedostructural swelling curve, = ( ), which is the swelling with time of the pedostructure by absorbing free water [11].…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

“…Regarding the other two curves, hydric conductivity and swelling curves, the specific equipment required for their measurement exists, but the characteristic parameters of these curves cannot be determined without a preliminary determination of the hydrostructural parameters of the sample, using TypoSoil ® . These 4 hydrostructural functions of the pedostructure are taken in charge by the soil water model Kamel ® [15,11] which uses their theoretical equations for modeling the soil dynamics within the internal organization of a pedon (Representative Elementary Volume of a soil profile in a Soil Mapping Unit). Other information about the horizons of the pedon is of course needed, including the percentage of pedostructure in each horizon, the thickness of each horizon, the percentage of other organizational volumes such as macropores, roots, stones, and so forth [11].…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

“…These 4 hydrostructural functions of the pedostructure are taken in charge by the soil water model Kamel ® [15,11] which uses their theoretical equations for modeling the soil dynamics within the internal organization of a pedon (Representative Elementary Volume of a soil profile in a Soil Mapping Unit). Other information about the horizons of the pedon is of course needed, including the percentage of pedostructure in each horizon, the thickness of each horizon, the percentage of other organizational volumes such as macropores, roots, stones, and so forth [11]. 4 rigid structure of the soil medium.…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

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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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Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

“…• The pedostructural hydric conductivity curve, = (dm/s) as function of the pedostructural water content [11].…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

“…• The pedostructural swelling curve, = ( ), which is the swelling with time of the pedostructure by absorbing free water [11].…”

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

Section: The 4 Hydrostructural Functions Of the Pedostructurementioning

confidence: 99%

See 3 more Smart Citations

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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2016

Hydrostructural Pedology

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Mechanisms of lateral and linear extension of gullies (dongas) in a subhumid grassland of South Africa

Podwojewski

Janeau

Caquineau

et al. 2020

Earth Surf Processes Landf

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The formation of deep gullies (called 'dongas' locally) in rangeland in KwaZulu-Natal Province in South Africa is a natural phenomenon. These U-shaped, very wide gullies have considerable lateral expansion due to the episodic collapse of sidewalls. The dongas have developed in duplex soils such as Luvisols and Lixisols formed on Permian sedimentary rocks or unconsolidated Quaternary colluvium. This study combined morphological, mineralogical and chemical characterization with measurements of grain-size content, structural stability and the complete shrinkage curve to detect changes in soil properties of the different horizons located in the gully banks. The different soil horizons present clear and sharp differences in physical and mineralogical properties. The topsoil with complete grass cover is very resistant to soil detachment. However, the leached E horizon and the BC horizon have low structural stability. The soil profile down to and including the Bt horizon contains exclusively illite in the clay fraction, while the BC colluvial layer and the C horizon (mudstone) contain expandable interstratified illite-smectite. The Bt horizon has a high water content at saturation and high shrinkage, while the BC and C horizons have a high residual shrinkage and a very low water content at saturation. Because this type of gully expansion is not significantly linked to slope value or the stream power index (SPI) at the gully head, to land-use change, high rainfall intensities or the threshold of concentrated runoff being exceeded at the gully head, other causes were investigated. It was concluded that the heterogeneity between horizons with different mineralogical properties and structural stabilities, soil types and parent material, anisotropic water-saturation and shrink-swell properties are of major importance. This heterogeneity between different soil horizon morphologies and their physical properties can explain why the relationship between the critical slope and the drainage area for gully initiation showed a threshold for gullying much lower than that found elsewhere.

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

Cited by 12 publications

References 27 publications

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

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

Bibliography

Mechanisms of lateral and linear extension of gullies (dongas) in a subhumid grassland of South Africa

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