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A platform for research: civil engineering, architecture and urbanism
Particle Transport in Saturated Fractured Media: Effect of Flow Velocity and Fracture Aperture
https://orcid.org/0000-0002-2239-1490
https://orcid.org/0000-0002-2573-3230
Transport of micron-sized particles in fractured rocks can potentially contaminate groundwater and may have important implications for environmental and human health. This study aimed to understand the transport of kaolinite particles and the fluorescein tracer through fractured chalk, particularly at high flow velocities and using various fracture apertures. Laboratory experiments were conducted and results were fitted to a model based on the advection–dispersion equation. The dispersion, attachment, and detachment parameters were evaluated and correlated with the flow velocity and fracture aperture. The results revealed the influence of hydrodynamic forces. Kaolinite particles traveled faster than fluorescein due to the size exclusion effect and higher dispersion of fluorescein. The size exclusion effect globally decreased with flow velocity, while dispersion of kaolinite and fluorescein increased. Kaolinite and fluorescein dispersed more in the narrower fracture. The attachment coefficient increased with flow velocity, and it is fracture aperture independent. The detachment coefficient increased with flow velocity and was higher in the narrower fracture due to higher shear stress. The study findings highlight the importance of considering high flow velocities and fracture aperture effect in understanding micron-sized particle transport mechanisms in chalk fractures, which is essential for assessing risks to groundwater resources and improving environmental protection.
This study examines the transport of micron-sized particles in fractured chalk at high flow velocities, which has the potential to contaminate groundwater and may have important implications for environmental and human health.
Particle Transport in Saturated Fractured Media: Effect of Flow Velocity and Fracture Aperture
https://orcid.org/0000-0002-2239-1490
https://orcid.org/0000-0002-2573-3230
Transport of micron-sized particles in fractured rocks can potentially contaminate groundwater and may have important implications for environmental and human health. This study aimed to understand the transport of kaolinite particles and the fluorescein tracer through fractured chalk, particularly at high flow velocities and using various fracture apertures. Laboratory experiments were conducted and results were fitted to a model based on the advection–dispersion equation. The dispersion, attachment, and detachment parameters were evaluated and correlated with the flow velocity and fracture aperture. The results revealed the influence of hydrodynamic forces. Kaolinite particles traveled faster than fluorescein due to the size exclusion effect and higher dispersion of fluorescein. The size exclusion effect globally decreased with flow velocity, while dispersion of kaolinite and fluorescein increased. Kaolinite and fluorescein dispersed more in the narrower fracture. The attachment coefficient increased with flow velocity, and it is fracture aperture independent. The detachment coefficient increased with flow velocity and was higher in the narrower fracture due to higher shear stress. The study findings highlight the importance of considering high flow velocities and fracture aperture effect in understanding micron-sized particle transport mechanisms in chalk fractures, which is essential for assessing risks to groundwater resources and improving environmental protection.
This study examines the transport of micron-sized particles in fractured chalk at high flow velocities, which has the potential to contaminate groundwater and may have important implications for environmental and human health.
Particle Transport in Saturated Fractured Media: Effect of Flow Velocity and Fracture Aperture
https://orcid.org/0000-0002-2239-1490
https://orcid.org/0000-0002-2573-3230
Transport of micron-sized particles in fractured rocks can potentially contaminate groundwater and may have important implications for environmental and human health. This study aimed to understand the transport of kaolinite particles and the fluorescein tracer through fractured chalk, particularly at high flow velocities and using various fracture apertures. Laboratory experiments were conducted and results were fitted to a model based on the advection–dispersion equation. The dispersion, attachment, and detachment parameters were evaluated and correlated with the flow velocity and fracture aperture. The results revealed the influence of hydrodynamic forces. Kaolinite particles traveled faster than fluorescein due to the size exclusion effect and higher dispersion of fluorescein. The size exclusion effect globally decreased with flow velocity, while dispersion of kaolinite and fluorescein increased. Kaolinite and fluorescein dispersed more in the narrower fracture. The attachment coefficient increased with flow velocity, and it is fracture aperture independent. The detachment coefficient increased with flow velocity and was higher in the narrower fracture due to higher shear stress. The study findings highlight the importance of considering high flow velocities and fracture aperture effect in understanding micron-sized particle transport mechanisms in chalk fractures, which is essential for assessing risks to groundwater resources and improving environmental protection.
This study examines the transport of micron-sized particles in fractured chalk at high flow velocities, which has the potential to contaminate groundwater and may have important implications for environmental and human health.
Particle Transport in Saturated Fractured Media: Effect of Flow Velocity and Fracture Aperture
Hawi, Hanan (author) / Ahfir, Nasre-Dine (author) / Ouahbi, Tariq (author) / Alem, Abdellah (author) / Wang, Huaqing (author)
ACS ES&T Water ; 3 ; 3132-3140
2023-09-08
Article (Journal)
Electronic Resource
English
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