Vertical porosity profile of a clay-rich marsh soil

Dudoignon, P.; Causseque, S.; Bernard, M.; Hallaire, Vincent; Pons, Y.

doi:10.1016/j.catena.2006.12.002

Cited by 12 publications

(15 citation statements)

References 31 publications

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“…Fig. 14. a -Schematic representation of the ductile-to-fragile behaviour of the clay dominant soil taking into account the W-C couple evolution and successive steps of fracturing, bresult on the shrinkage fracture network observed on a polish section of a soil prism (grassland; from Dudoignon et al, 2007 andGallier, 2011). 1, 2 and 3 represent the successive steps of fracturing according to the shrinkage effect and increase of cohesion of the clay matrix which is associated to the desiccation effect.…”

Section: Discussion and Soil Structure -Hydromecanical Property Relatmentioning

confidence: 99%

“…their textural and mineralogical homogeneity all over the West Marsh area (Ducloux, 1989;Righi et al, 1995;Pons & Gerbaud, 2005;Bernard, 2006), 2. and structural profiles which show the clay-rich material from its solid state near the surface down to plastic and liquid state in depth (Bernard, 2006Bernard-Ubertosi et al, 2009;Dudoignon et al,2007 ;Figure 1b).…”

Section: Methodsmentioning

confidence: 99%

“…The method was induced by previous works on the clay matrix microstructure behaviours based on image analyses of thin sections captured by optical microscopy and by SEM (Dudoignon & Pantet, 1998;Dudoignon et al, 2004;Dudoignon et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure – Hydro-Mechanical Property Relationship in Clay Dominant Soils

Gallier¹,

Dudoignon²,

Hillaireau³

2012

An Introduction to the Study of Mineralogy

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Section: Discussion and Soil Structure -Hydromecanical Property Relatmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure – Hydro-Mechanical Property Relationship in Clay Dominant Soils

Gallier¹,

Dudoignon²,

Hillaireau³

2012

An Introduction to the Study of Mineralogy

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“…Numerous authors (e.g. Dexter and Richard 2009; Dudoignon et al 2007;Kutílek 2004) evaluated the various scales of porosity. In summary, for soils, macropores typically relate to vertical prism joints or any other pores which are non-capillary; mesopores are typically due to shrinkage cracking and 100 -2 000 μm; micropores are due to the clay-matrix and particle arrangement and are capillary pores; and submicropores relate to water molecules and flow path inhibiting sized capillary openings.…”

Section: Scale Of Porositymentioning

confidence: 99%

Porosity Reviewed: Quantitative Multi-Disciplinary Understanding, Recent Advances and Applications in Vadose Zone Hydrology

Dippenaar¹

2013

Geotech Geol Eng

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Porosity -one of the most basic mechanical properties of a mediumhas implications in a vast range of disciplines and used for a similar vast range of applications. These include, for instance, the storage and flow of water; the compressible component of earth materials, which can be subjected to consolidation under loading; the variable parameter in the swelling and shrinkage of clays; and possibly a governing parameter in the formation of wetlands and perched water tables. This review notes the relevance of a fourfold quantification of porosity for vadose zone studies, viz. (1) type (matrix or structure), (2) scale (submicro to macro scale), (3) connectivity, and (4) water saturation. This is followed by a review of recent advances in the quantification and description of porosity in porous media (visual and remote sensing methods, porosimetry, geometrical approaches, empirical estimations, densest packing simulations, etc.), the applications to quantification of hydrological parameters, and a brief glimpse into the significance of porosity in a temporary hillslope wetland underlain by Archaean Lanseria gneiss in South Africa. Final comments are made regarding areas where quantification of porosity is problematic.Keywords: porosity; void ratio; vadose zone; effective porosity; fractal; microstructure; porosimetry; ferricrete; temporary hillslope wetland IntroductionAlbeit a straightforward concept (how hard can determining the ratio of voids to solids possibly be?), quantification of porosity is often significantly simplified. The importance of porosity in hydrology as a primary input parameter in almost all subsequent calculations is overlooked and the parameter is estimated without any validation, resulting in significant unquantifiable errors in hydraulic parameters. However, the simple percentage value of porosity is only one such aspect. The importance of type, scale and connectivity of porosity is commonly understood, but rarely evaluated in significant detail.A detailed discussion in Miller and Gray (2002) on the status of groundwater research accentuates a number of aspects requiring more research and where our understanding is often not sufficient. Reference is made particularly to preferential flow paths such as fractures and the resulting complicated accounting of interactions between these fractures and the flow through the primary pore space. They continue to elaborate on the difficulty of accounting for scale ranging from molecular to regional field problems. Fractured systems are singled out due to the difficulty in characterising and modelling fractures with available methods and because of their interaction with the porous matrix.As this is a review paper, basic concepts will be described concisely for the sake of cross-disciplinary agreement. It is impossible to cover the whole range of methods applicable to porosity. The purpose of this paper is primarily to summarise considerations in the quantification of porosity, to review recent advances in the quantification of porosity, to ap...

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“…Two dimensional approaches on thin sections or consolidated blocks, combined to image processing, have been widely used to study the pore size distribution, pore shape, and pore connectivity [2,3,4,5]. To reach the three-dimensional geometry of soil porosity, it is possible to use different techniques such as serial sectioning [6] or X-ray computed tomography (X-ray µCT).…”

Section: Introductionmentioning

confidence: 99%

Characterizing soil macroporosity by X-ray microfocus computed tomography and quantification of the coring damages.

Gallier¹,

Hubert²,

Robinet³

et al. 2010

EPJ Web of Conferences

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Abstract. X-ray Computed Tomography (X-ray µCT) was employed to characterize vertical variations of structural porosity of a soil profile (pore dimension higher than 5.10 3 µm3 ). Three distinct horizons of a Cambisol have been studied for a total depth of 75 cm: L, S 1 /S 2 and S 2 /S Fe horizons. Samples have been cored in situ by driving in PVC tubes (inner diameter 10 cm). From reconstructed and filtered volumes, pores segmentation allows to study variations of structural porosity within the profile. Two kinds of porosity were identified: biological pores (tube-like) and physical pores (fracture-like). Structural porosity content varies strongly according to the horizons: from 5.48% in the L horizon to 6.48% in the S 1 /S 2 horizon. The 3D connectivity of both of these pore types was also assessed. During sampling, soil shearing induced damages around the cores. Identification and quantification of the damaged zone was performed from the calculation of porosity profile from core surface to core heart. In average, the damaged zone reaches a depth of 1 cm. Porosity loss (compaction) or porosity increase (fracturing) was observed according to the studied profile.

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Vertical porosity profile of a clay-rich marsh soil

Cited by 12 publications

References 31 publications

Microstructure – Hydro-Mechanical Property Relationship in Clay Dominant Soils

Microstructure – Hydro-Mechanical Property Relationship in Clay Dominant Soils

Porosity Reviewed: Quantitative Multi-Disciplinary Understanding, Recent Advances and Applications in Vadose Zone Hydrology

Characterizing soil macroporosity by X-ray microfocus computed tomography and quantification of the coring damages.

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