3D multifractal characterization of computed tomography images of soils under different tillage management: Linking multifractal parameters to physical properties

Gómez, Diego Soto; Pérez‐Rodríguez, Paula; Juíz, Laura Vázquez; Paradelo, Marcos; López-Periago, J. Eugenio

doi:10.1016/j.geoderma.2019.114129

Cited by 15 publications

(11 citation statements)

References 42 publications

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“…Another important element is the multifractal singular spectrum [α, f(α)] presenting an upwardly convex parabolic shape, which proves the multifractal behavior of PSDs in these samples. 33,53 This curve is tangent to the internal bisector f(α) = α (see Figure 7), 36 which confirms the accuracy of our calculation. The parameter α 0 is used, where its higher value is regarded as more obvious local agglomeration of pores to reflect the degree of the concentration of PSD.…”

Section: Methodssupporting

confidence: 83%

Investigation on the Methane Adsorption Capacity in Coals: Considerations from Nanopores by Multifractal Analysis

Liu

Cai

et al. 2021

Energy Fuels

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Methane adsorption properties of coal are essential for coalbed methane (CBM) extraction and clean energy utilization. However, the effect of nanopores on CH 4 adsorption in high volatile bituminous coal and anthracite remains to be revealed. In this work, the multidimensional description of nanopores was established using gas adsorption and focused ion beam-scanning electron microscopy (FIB-SEM) experiments. The heterogeneous features at different sizes were finely quantified by multifractal analysis. Results show that the pores with size smaller than 100 nm, as storage section, are isolated in space. The nanopores of the sample LHG have stronger heterogeneity in multiple dimensions. The pore-size distributions with apparent aggregation are composed of 0.45−0.70 nm (from CO 2 adsorption), 2−50 nm (from N 2 adsorption), and 10−50 nm (from FIB-SEM). The nanopore structure affects the adsorption capacity of CH 4 mainly in the micropore structure, pore morphology, and heterogeneity. The well-developed micropore structure is conducive to methane enrichment. The narrow slit-like pores with the higher specific surface area are beneficial to gas storage, whereas nongrid aggregates of plate-like particles facilitate the desorption and diffusion of gas. The more robust pore heterogeneity in the range of 0.45−0.70 and 2−50 nm significantly contribute to methane adsorption. This work may allow significant insights into the interaction of coal with gases during enhancing CBM recovery.

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Section: Methodssupporting

confidence: 83%

Investigation on the Methane Adsorption Capacity in Coals: Considerations from Nanopores by Multifractal Analysis

Liu

Cai

et al. 2021

Energy Fuels

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“…In a first approach, we might affirm the existence of multifractality of the pore spaces for all the management practices and secondary forest samples before and after the W-D cycles. This fact is corroborated when the generalized fractal dimension is analyzed: D 0 > D 1 > D 2 ( Table 2 ) [ 23 , 45 , 56 ]. D 0 was reduced by around 4% for F and increased by around 3% for NT ( Table 2 ).…”

Section: Resultsmentioning

confidence: 63%

“…The asymmetry for the right side of the spectrum observed for all the samples indicates low patterns of spatial variability, and here it was associated with low spatial variability of the pore size distribution [ 44 ]. Thus, this investigation showed that for F, MT, and NT, the observed asymmetries could be linked to less spatial variability in the range of pore sizes investigated; while for CT, smaller changes in the spectra indicated small or minor changes in the heterogeneity of the pore size distribution [ 56 ].…”

Section: Discussionmentioning

confidence: 99%

Soil Pore Network Complexity Changes Induced by Wetting and Drying Cycles—A Study Using X-ray Microtomography and 3D Multifractal Analyses

Oliveira

Cássaro

Posadas³

et al. 2022

IJERPH

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Soils are dynamic and complex systems in their natural state, which are subjected to profound changes due to management. Additionally, agricultural soils are continuously exposed to wetting and drying (W-D) cycles, which can cause modifications in the complexity of their pores. Thus, we explore how successive W-D cycles can affect the pore network of an Oxisol under contrasting managements (conventional tillage—CT, minimum tillage—MT, no tillage—NT, and secondary forest—F). The complexity of the soil pore architecture was evaluated using a 3D multifractal approach combined with lacunarity, Shannon’s entropy, and pore geometric parameters. Our results showed that the multifractal approach effectively identified and quantified the changes produced in the soil pore architecture by the W-D cycles. The lacunarity curves revealed important aspects of the modifications generated by these cycles. Samples under F, NT, and MT suffered the most significant changes. Pore connectivity and tortuosity were largely affected by the cycles in F and NT. Our findings demonstrated that the 3D geometric parameters and normalized Shannon’s entropy are complementary types of analysis. According to the adopted management, they allowed us to separate the soil into two groups according to their similarities (F and NT; CT and MT).

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“…(a) Three challenges in studying flow and solute transport in porous media: the heterogeneity (Soto‐Gómez et al, 2020), the multi‐scale nature (Sathaye et al, 2014), and the uncertainty (Cover of International Journal of Uncertainty Quantification); (b) deposition of the contaminants (uranium, the bright white material in the red circle, found at the Hanford site, WA, USA) on the surface of soil particles at the pore‐scale. Adapted from Liu et al (2006)…”

Section: Introductionmentioning

confidence: 99%

Recent progress in multi‐scale modeling and simulation of flow and solute transport in porous media

et al. 2021

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The heterogeneity and multi‐scale characteristics of porous media (such as soil aquifers) bring a series of uncertainties in studying flow and solute transport. In particular, the mathematical representation of these physical processes at different temporal and spatial scales, that is, the constitutive equations and parameters, is largely varied, which creates grand challenges in multi‐scale modeling and numerical simulation of flow and solute transport in porous media. In recent years, we acknowledge that at‐scale models and simulations have been greatly progressed, which means that at each individual scale, the transport phenomena, numerical methods, and solvers have been developed and utilized at different levels. However, the long‐standing problem, scale coupling between the pore‐ and Darcy‐scale in porous media, has not been well resolved. In this review, we present an overview and classification of the current multi‐scale models, aiming to understand small‐scale flow and solute transport processes when/where needed in a larger system. This review begins with a brief introduction of the pore‐ and Darcy‐scale theories. Two groups of multi‐scale models that are state‐of‐the‐art, based on the Darcy–Brinkman–Stokes equation and the domain decomposition method, respectively, are explained in the context of research progress in model theory, numerical algorithms, and applications. Future research perspectives and challenges are also discussed from both modeling and application points of view. This review is expected to provide a fundamental understanding of flow and solute transport in porous media and concept of developing multi‐scale models to bridge the gaps between processes in adjacent scales. This article is categorized under: Science of Water > Water Quality Science of Water > Methods Science of Water > Hydrological Processes

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3D multifractal characterization of computed tomography images of soils under different tillage management: Linking multifractal parameters to physical properties

Cited by 15 publications

References 42 publications

Investigation on the Methane Adsorption Capacity in Coals: Considerations from Nanopores by Multifractal Analysis

Investigation on the Methane Adsorption Capacity in Coals: Considerations from Nanopores by Multifractal Analysis

Soil Pore Network Complexity Changes Induced by Wetting and Drying Cycles—A Study Using X-ray Microtomography and 3D Multifractal Analyses

Recent progress in multi‐scale modeling and simulation of flow and solute transport in porous media

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