Colloid transport through a variable-aperture fracture under unfavorable attachment conditions: Characterization with a continuous time random walk model

Zheng, Linjin; Wang, Lichun; James, Scott C.; Chrysikopoulos, Constantinos V.

doi:10.1016/j.colsurfa.2022.128822

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…Another common mathematical model used to describe solute transport in heterogeneous media is the continuous-time random walk model (CTRW). Initially developed to describe the theory of electron irregular migration in statistical physics, CTRW [93,94] has also been introduced in geology to address the problem of irregular solute transport in porous and fractured media. After comparing the parameter variations in the CDE, TRM, and CRTW methods, the results indicate that the CTRW modeling method is better suited for determining the concentration of non-reactive pollutants in low-permeability soil media with small depths [95].…”

Section: Application and Progress In The Assessment Of Process-based ...mentioning

confidence: 99%

A Review on Process-Based Groundwater Vulnerability Assessment Methods

Geng

Jing-lin

et al. 2023

Processes

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The unreasonable development and pollution of groundwater have caused damage to the groundwater system and environmental problems. To prevent this, the concept of “groundwater vulnerability” was proposed, and various evaluation methods were developed for groundwater protection. However, with changing climatic conditions and human activities, groundwater vulnerability is now emphasizing physical processes. This study aims to review and analyze the principles and applications of process-based groundwater vulnerability methods to achieve the source protection of groundwater resources. It introduces the assessment method and elaborates on pollutant migration processes and numerical simulation technology. Relevant articles from the past 30 years are reviewed to show the evolution of process-based groundwater vulnerability assessment. The study also discusses current research trends and proposes future development paths. It concludes that process-based groundwater vulnerability assessment will become the mainstream method, and modern technologies such as artificial intelligence will be necessary to solve challenges and achieve sustainable development.

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Section: Application and Progress In The Assessment Of Process-based ...mentioning

confidence: 99%

A Review on Process-Based Groundwater Vulnerability Assessment Methods

Geng

Jing-lin

et al. 2023

Processes

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“…Additionally, the mass transfer process between the immobile zone (i.e., RZs) and mobile zone (i.e., main flow channel) can lead to a late time transport tailing process [12]. Such tailing process has been widely recognized in many geological environments, including the hyporheic zones [13,14], the nested groundwater systems [15], and the fractures [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Pore Geometry on Late Time Solute Transport with the Presence of Recirculation Zone

Yang

Gu³

et al. 2022

Energies

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The solute transport process in porous media is central to understanding many geophysical processes and determines the success of engineered applications. However, fundamental understanding of solute transport in heterogeneous porous media remains challenging especially when inertial effects are significant. To address this challenge, we employed direct numerical simulations in a variety of intrapore geometries at a high Reynolds number (Re = 10) flow regime, where recirculation zones (RZs) are present with significant inertial effects. We find that the volume of RZs depends on pore geometries. Moreover, RZs serve as an immobile domain that can trap and release solutes that lead to non-Fickian transport, characterized by the early arrival and heavy tailing of breakthrough curves and bimodal residence time distributions (RTDs). Lastly, the late time portion of RTDs is fitted to the power law function with determined exponent n, where n depends on the pore geometries and consequently the volume of RZs. Our study sheds light on the mechanisms of an immobile zone on the solute transport, especially improving our understanding of late time transport tailing in pressurized heterogeneous porous media.

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Predicting colloid transport and deposition in an array of collectors

Xiong

Yang

et al. 2023

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Colloid transport through a variable-aperture fracture under unfavorable attachment conditions: Characterization with a continuous time random walk model

Cited by 3 publications

References 58 publications

A Review on Process-Based Groundwater Vulnerability Assessment Methods

A Review on Process-Based Groundwater Vulnerability Assessment Methods

The Effects of Pore Geometry on Late Time Solute Transport with the Presence of Recirculation Zone

Predicting colloid transport and deposition in an array of collectors

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