Scale Dependence of Dispersion Coefficient for Solute Transport in Porous Media Using Image Analysis
Publication: Journal of Hydrologic Engineering
Volume 28, Issue 6
Abstract
Scale dependence of dispersion coefficient () in the advection-dispersion equation (ADE) for solute transport in porous media was investigated by a series of experiments using image analysis. A hexahedral plexiglass box sized () was set and packed with glass beads as porous media. The solute transport under different conditions was simulated by changing the particle size of glass beads, flow rate, and detection scale using Bright Blue as tracer. The image analysis method was used to dynamically monitor and identify the spatiotemporal variation of solute concentration distribution. The results showed that image analysis can effectively monitor and identify the solute concentration in porous media, as indicated by an value of 0.9890. There is an obvious linear relationship between hydraulic gradient () and velocity () in porous media under different experimental conditions. The ADE model is suitable for solute breakthrough curve (BTC) with good fitting accuracy, and can effectively reflect the concentration variation during solute transport. The key parameters controlling the solute transport were analyzed. has abnormal diffusion (i.e., non-Fickian phenomenon) and scale dependence, and BTCs had a long tail, which becomes more obvious with the increase of flow rate, medium particle size, and transport scale.
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Data Availability Statement
Some or all experimental and simulated data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by National Natural Science Foundation of China (Nos. 41877191 and 41831289).
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Journal of Hydrologic Engineering
Volume 28 • Issue 6 • June 2023
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© 2023 American Society of Civil Engineers.
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Received: Jul 11, 2022
Accepted: Feb 8, 2023
Published online: Apr 4, 2023
Published in print: Jun 1, 2023
Discussion open until: Sep 4, 2023
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