Time Behavior of Anomalous Solute Transport in Three‐Dimensional Cemented Porous Media

Hou, Yusong; Wu, Jichun; Jiang, Jian-Guo

doi:10.2136/sssaj2018.12.0476

Cited by 5 publications

(3 citation statements)

References 66 publications

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“…It has been observed that in many cases, two-dimensional simulation schemes can grasp the majority of the physical processes of solute transport and reduce the simulation complexity and calculation costs, compared with threedimensional simulations. In addition, in the previous study, we found that when the cementation degree increases, the velocity probability distribution of fluid in 2D media and 3D media and its change trend are similar [28,29]. Therefore, this study performed two-dimensional simulations at the pore scale for the purpose of exploring the solute dilution processes in porous media with different cementation degrees.…”

Section: Methodsmentioning

confidence: 89%

Using a Pore-Scale Modelling Approach to Study Solute Dilution Process through Cemented Porous Media

Hou

Liu

et al. 2022

Geofluids

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In this study, a pore-scale simulation method is applied to quantitatively study the variation of solute dilution through porous media with different cementation degrees and explore the corresponding mechanisms. The study results indicated that the cementation degrees of the solid grains had a significant effect on the solute dilution process and that the influence was very complicated. The complexity was manifested in that the effect of rising cementation degree on the solute dilution process would be different or even completely opposite in the porous media in which the solid grains cement slightly with that in porous media with a higher cementation degree. For example, for the porous media in which the solid grains were slightly cemented (the percentage of the cemented solid grains P c is less than 40%), the dilution effects became enhanced with the increase of cementation degree. Then, after P c increased to about 55%, the dilution effect was obviously weakened, and the solute was in an incomplete dilution state for a long period of time. In addition, this study found that the properties of the flow fields may vary greatly in porous media with different cementation degrees and that those differences in the flow fields resulted in the distinct behavior of the solute dilution. It is interesting to note that a more heterogeneous flow field had not necessarily led to the enhancement of the dilution process.

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Section: Methodsmentioning

confidence: 89%

Using a Pore-Scale Modelling Approach to Study Solute Dilution Process through Cemented Porous Media

Hou

Liu

et al. 2022

Geofluids

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“…[20] reported that the fractal derivative diffusion model is suitable for simulating anomalies of moisture transport in cement-based materials. Furthermore, continuous-time random walk (CTRW) models have been confirmed to be able to explain anomalous transport in three-dimensional porous media with different cementation degrees [21]. These models use fractal geometry to describe the irregularities in a porous medium.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Diffusion Modeling via the Riemann–Liouville Nonlocal Structural Derivative and Its Application in Porous Media

Xu,

Liu,

Chen

et al. 2024

Fractal Fract

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Ultrafast diffusion disperses faster than super-diffusion, and this has been proven by several theoretical and experimental investigations. The mean square displacement of ultrafast diffusion grows exponentially, which provides a significant challenge for modeling. Due to the inhomogeneity, nonlinear interactions, and high porosity of cement materials, the motion of particles on their surfaces satisfies the conditions for ultrafast diffusion. The investigation of the diffusion behavior in cementitious materials is crucial for predicting the mechanical properties of cement. In this study, we first attempted to investigate the dynamic of ultrafast diffusion in cementitious materials underlying the Riemann–Liouville nonlocal structural derivative. We constructed a Riemann–Liouville nonlocal structural derivative ultrafast diffusion model with an exponential function and then extended the modeling strategy using the Mittag–Leffler function. The mean square displacement is analogous to the integral of the corresponding structural derivative, providing a reference standard for the selection of structural functions in practical applications. Based on experimental data on cement mortar, the accuracy of the Riemann–Liouville nonlocal structural derivative ultrafast diffusion model was verified. Compared to the power law diffusion and the exponential law diffusion, the mean square displacement with respect to the Mittag–Leffler law is closely tied to the actual data. The modeling approach based on the Riemann–Liouville nonlocal structural derivative provides an efficient tool for depicting ultrafast diffusion in porous media.

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“…Trace elements have a wider applicability, and the main factor controlling the content of major and trace elements is particle size. In addition, laboratory tracing experiments are valuable tools for understanding and identifying flow and transport processes [14]. The most commonly used tracing experimental devices include soil columns and sand tanks, which are used to study the transport and hydraulic characteristics of solutes (conservative and reactive) [15], thereby gaining a deeper understanding of the trends in material transport in aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Characteristics of Surface Sediments and Their Migration Trends in the Nearshore Waters of East Guangdong

Wang

Wan

et al. 2023

Sustainability

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By collecting surface sediment samples from 158 stations in the near-shore waters of eastern Guangdong, grain size analysis and grain size parameter calculations were performed to explore the characteristics and migration trends of surface sediments in the area. The analysis of the grain size results showed that the surface sediments in the nearshore waters of east Guangdong could be classified into nine sediment types, mainly including seven types of gravel sand ((g)S), gravel muddy sand ((g)mS), gravelly mud ((g)M), sand (S), silty sand (zS), sandy silt (sZ) and silt (Z). The relative percentages of gravel, sand, silt and mud were 0.7%, 40.56%, 46.7% and 12.04%, respectively. The average grain size varied from −2φ to 8φ, with an average of 4.94φ. The selection coefficient ranged from 0.44 to 3.78, with an average value of 1.8. The skewness distribution ranged from −0.34 to 0.67, with an average value of 0.07. By extracting and analyzing the spatial distribution information of grain size in the study area, using the Gao–Collins migration trend analysis method and incorporating dynamic factors such as tidal currents and waves, the transport direction and trend of surface sediments in the study area could be analyzed and inferred. The results show that the surface sediment migration trend was significant, migration on the north side of Nan’ao Island was in an east-to-west direction, and the sediment of Yifeng River was mainly deposited to the sand spout at the mouth of Lianyang River. After southward transport from the Houjiang waterway, the migration was mainly southeastward and the trend was quite significant until the 20 m isobath, where the trend gradually decreased. The sediments of the Rongjiang River were mainly deposited outside the mouth of Niutian Yang and Rongjiang River, and the surface sediments of Guang’ao Bay and Haimen Bay migrated in the northwest–southeast direction. After the 30 m isobath, the southeast corner of the study area migrated in the southeast–south direction. This sediment transport pattern revealed by the grain size migration trend is in good agreement with the physical and hydrodynamic conditions of the study area and provides an important reference for decisions regarding port dredging and waterway management in the area.

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Time Behavior of Anomalous Solute Transport in Three‐Dimensional Cemented Porous Media

Cited by 5 publications

References 66 publications

Using a Pore-Scale Modelling Approach to Study Solute Dilution Process through Cemented Porous Media

Using a Pore-Scale Modelling Approach to Study Solute Dilution Process through Cemented Porous Media

Ultrafast Diffusion Modeling via the Riemann–Liouville Nonlocal Structural Derivative and Its Application in Porous Media

Grain Size Characteristics of Surface Sediments and Their Migration Trends in the Nearshore Waters of East Guangdong

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