Numerical modelling of colloid transport in sets of parallel fractures with fracture skin

Nair, Vinish V.; Thampi, Santosh G.

doi:10.1016/j.colsurfa.2010.05.003

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…Further complicating the potential for SOC to mobilise during abstraction is the concept of fracture skins, described as a thin coating on the rock matrix with different sorption and diffusion properties to that of the undisturbed rock matrix. The skin includes zones of altered rock and coatings of the rock surface by organic matter, precipitated minerals and infiltrated debris 50 and their influence as a potential source of DOC 51 .…”

Section: Discussionmentioning

confidence: 99%

Dissolved Organic Carbon Mobilisation in a Groundwater System Stressed by Pumping

Graham¹,

Baker²,

Andersen³

2015

Sci Rep

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The concentration and flux of organic carbon in aquifers is influenced by recharge and abstraction, and surface and subsurface processing. In this study groundwater was abstracted from a shallow fractured rock aquifer and dissolved organic carbon (DOC) was measured in observation bores at different distances from the abstraction bore. Groundwater abstraction at rates exceeding the aquifers yield resulted in increased DOC concentration up to 3,500 percent of initial concentrations. Potential sources of this increased DOC were determined using optical fluorescence and absorbance analysis. Groundwater fluorescent dissolved organic material (FDOM) were found to be a combination of terrestrial-derived humic material and microbial or protein sourced material. Relative molecular weight of FDOM within four metres of the abstraction well increased during the experiment, while the relative molecular weight of FDOM between four and ten metres from the abstraction well decreased. When the aquifer is not being pumped, DOC mobilisation in the aquifer is low. We hypothesise that the physical shear stress on aquifer materials caused by intense abstraction significantly increases the temporary release of DOC from sloughing of biofilms and release of otherwise bound colloidal and sedimentary organic carbon (SOC).

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Section: Discussionmentioning

confidence: 99%

Dissolved Organic Carbon Mobilisation in a Groundwater System Stressed by Pumping

Graham¹,

Baker²,

Andersen³

2015

Sci Rep

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“…The objective of this work is to analyze the effect of various parameters of fracture-skin and viruses on the relative concentration of viruses in the fracturematrix coupled system. Although Robinson et al (1998) and Nair and Thampi (2010) have developed mathematical models for transport of contaminants and colloids in fractured porous media, virus transport mechanism is unique when compared to contaminants and other colloids. The purpose of this paper is to specifically analyze the evolution of virus concentration in the presence of fracture-skin in the fractured porous media.…”

Section: Introductionmentioning

confidence: 99%

Effect of fracture-skin on virus transport in fractured porous media

Natarajan

Kumar²

2012

Geoscience Frontiers

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“…The deposition coefficient, κ , depends on the physical and chemical conditions of the groundwater‐colloid‐fracture system and can be estimated by fitting the results of laboratory or field experiments (Abdel‐Salam & Chrysikopoulos, 1994). The deposition coefficient has been adopted extensively to describe colloid deposition in fractures (e.g., Abdel‐Salam & Chrysikopoulos, 1994, 1995; James & Chrysikopoulos, 1999; Masciopinto et al, 2011; Masciopinto & Visino, 2017; Nair & Thampi, 2010) and has also been employed in the present study.…”

Section: Introductionmentioning

confidence: 99%

A Modified Time Domain Random Walk Approach for Simulating Colloid Behavior in Fractures: Method Development and Verification

Yosri

Dickson‐Anderson

El‐Dakhakhni

2020

Water Resources Research

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Colloids are ubiquitous in groundwater systems, and understanding their behavior is of critical importance as they can pose a threat to human and environmental health. Extensive research has been conducted to model colloid behavior in fractures leading to the development of a number of analytical solutions, albeit for single fractures. However, the application of these analytical solutions at the network scale has not yet been established; thus, fracture networks are modeled using numerical techniques that are verified in single fractures first. Time domain random walk (TDRW) is a Lagrangian‐based approach originally designed to simulate solute transport in single fractures considering advection, dispersion, and matrix diffusion. The present study develops a modified TDRW approach (MTDRW) to consider colloid‐specific transport mechanisms based on an analytical solution describing colloid behavior in single fractures. The MTDRW approach was validated through simulating the behavior of (i) monodisperse colloids in a synthetic, single fracture with and without matrix diffusion; (ii) polydisperse colloids in a synthetic, single fracture with impermeable matrix; and (iii) monodisperse colloids in a synthetic impermeable fracture network. In all three cases, the MTDRW approach replicated the results of analytical solutions in single fractures and the semianalytical solution in fracture networks. The MTDRW approach is expected to enhance the reliability of colloid transport modeling due to its capacity to simulate the physiochemical heterogeneity across the network. This is required to (i) evaluate the aquifer vulnerability to colloid migration; (ii) predict the aquifer resilience under contamination events; and (iii) develop effective planning, management, and remediation strategies.

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Numerical modelling of colloid transport in sets of parallel fractures with fracture skin

Cited by 15 publications

References 26 publications

Dissolved Organic Carbon Mobilisation in a Groundwater System Stressed by Pumping

Dissolved Organic Carbon Mobilisation in a Groundwater System Stressed by Pumping

Effect of fracture-skin on virus transport in fractured porous media

A Modified Time Domain Random Walk Approach for Simulating Colloid Behavior in Fractures: Method Development and Verification

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