Silty topsoil structure and its dynamics: the fractal approach

Gomendy, V.; Bartoli, F.; Burtin, G.; Doirisse, M.; Philippy, R.; Niquet, S.; Vivier, H.

doi:10.1016/s0016-7061(98)00103-7

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…Also, PSDs determined by two combined methods, for example, MIP and adsorption isotherms (Jocefaciuk et al, 2001) or MIP and water retention curves Gomendy et al, 1999), demonstrated the fractal nature of soil porosity. A multiscale model of soil structure, the PSF model (Perrier et al, 1999), associated both a fractal pore-number size distribution and a fractal solid number size distribution by incorporating a third phase, the interface, that is intermediate between the pore and solid phases.…”

Section: Introductionmentioning

confidence: 97%

Multifractal analysis of Hg pore size distributions in soils with contrasting structural stability

Paz‐Ferreiro

Vázquez

2010

Geoderma

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Section: Introductionmentioning

confidence: 97%

Multifractal analysis of Hg pore size distributions in soils with contrasting structural stability

Paz‐Ferreiro

Vázquez

2010

Geoderma

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“…A contact angle of zero occurs if the liquid wets perfectly, and a contact angle of 90° corresponds to no wetting of the surface. If the contact angle is greater than 90°, as for mercury intruding into soil, the fluid has to be forced in (Gomendy et al , 1999). The capillary rise method (Ellerbrock et al , 2005; Goebel et al , 2005) is a convenient way to measure contact angle on small samples of soil in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Wetting of agricultural soil measured by a simplified capillary rise technique

Matthews¹,

Watts²,

Powlson³

et al. 2008

European J Soil Science

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We describe the use of a capillary rise method to measure the wettability of 10 samples of agricultural soil from Rothamsted long-term experimental sites. The samples have very similar clay contents, but organic carbon (C) contents range from 11.5 to 31.2 g kg À1 . Their wetting rates were interpreted by an improved method of data analysis, consistent with the Washburn equation, and showed an increase in the effective contact angle between the water meniscus and the soil with increasing C content. This corresponds to a decrease in wettability with increasing C content, and accords with other results reported in the literature. By contrast with water, we found that capillary rise for n-hexane into soil did not depend on the soil's bulk density or C content. A priori calculations of the expected wetting rates from fluid properties and an effective hydraulic radius estimated by other methods gave magnitudes and trends that agreed with our experimental data. The results show that estimates of effective hydraulic radius can provide a useful approximation for characterizing soil wetting, but that further modelling should be carried out.

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“…The analysis of pore systems and PSDs is probably the area of soil physics where fractals have been most widely used (e.g., Ahl and Niemeyer, 1989; Rieu and Sposito, 1991a,b; Bartoli et al, 1992, 1998, 1999; Hallett et al, 1998; Rieu and Perrier, 1998; Perrier et al, 1999; Bird and Perrier, 2003). Fractal dimensions, D , have been estimated from PSDs obtained by direct methods, i.e., image analysis (Pachepsky et al, 1996b; Dathe et al, 2001, 2006; Menéndez et al, 2005), and indirect methods, mainly water characteristic curves (e.g., Toledo et al, 1990; Crawford et al, 1995; Perfect, 1999), Hg intrusion porosimetry (e.g., Bartoli et al, 1991; Pachepsky et al, 1995, 1996a), adsorption isotherms (e.g., Sokolowska et al, 1997; Hajnos et al, 2000), or a combination of two or more of these (Bartoli et al, 1991, 1999; Hallett et al, 1998; Gomendy et al, 1999; Sokolowska and Sokolowski, 1999).…”

mentioning

confidence: 99%

Multifractal Analysis of Pore Size Distributions as Affected by Simulated Rainfall

Vázquez

Paz‐Ferreiro

Miranda

et al. 2008

Vadose Zone Journal

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A: PSD, pore size distribution; VPD, volume pore distribution.S S : M M Rainfall changes the physical state, pore system geometry, and structure of soils. Characteriza on of the soil pore system provides a realis c base to understand the reten on and movement of water in soil. The objec ve of this work was to es mate mul fractal parameters from Hg injec on porosimetry data on the uppermost soil surface layer as aff ected by simulated rainfall. Soil aggregates were sampled at the 0-to 2-cm depth in a loamy soil, both on a recently lled soil surface and on its disturbed counterpart a er 260-mm cumula ve rainfall. Pore size distribu ons (PSDs) were determined by Hg intrusion porosimetry from 0.005-to about 100-μm pore diameters on 10 samples per surface stage. The rainfall reduced aggregate pore volume, showing signifi cant diff erences between the pore space of the reference and the disturbed soil surfaces. A mul fractal analysis was performed by means of scaling of the moments ranging from −10 < q < 10 for all PSDs. Mean values of the entropy dimension, D 1 , and correla on dimension, D 2 , in the aggregate set sampled a er rain disturbance were lower than those of the reference stage; however, mean values of the diff erence Δ(D 1 − D 2 ), the Hölder exponent of order zero, α 0 , and widths of the le (α 0 − α q+ ) and right (α q− − α 0 ) hand sides of the singularity spectra f(α) a er rainfall ac on were higher than those of the ini al soil surface. Entropy dimension, D 1 , and the width of the le (α 0 − α q+ ) hand side of the f(α) spectra best discriminated between PSDs of the reference ini al soil surface vs. soil surface disturbed by rain.

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Silty topsoil structure and its dynamics: the fractal approach

Cited by 13 publications

References 39 publications

Multifractal analysis of Hg pore size distributions in soils with contrasting structural stability

Multifractal analysis of Hg pore size distributions in soils with contrasting structural stability

Wetting of agricultural soil measured by a simplified capillary rise technique

Multifractal Analysis of Pore Size Distributions as Affected by Simulated Rainfall

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