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Laboratory Flushing Tests of Dissolved Contaminants in Heterogeneous Porous Media with Low-Conductivity Zones

Kurasawa, Tomoki Takahashi, Yoshitaro Suzuki, Mariko Inoue, Kazuya 神戸大学

2023.04

概要

The retention of contaminants within low-conductivity regions such as clay lenses and aquitards can greatly affect groundwater remediation processes. The aim of this study was to experimentally investigate the effects of the geometry of low-conductivity zones, conductivity contrast, and flow regime on solute flushing. We conducted a series of flushing tests in cylindrical models containing a cylindrical low-conductivity zone (i.e., low-K zone) embedded in a highly conductive medium (i.e., high-K zone). Seven models comprising four high-conductivity-contrast (SL, SS, LL, and LS), one medium-contrast (LLM), one low-contrast (LLL), and one homogeneous (H) models were considered. Experiments were conducted at two flow rates (Q = 0.6 and 26 cm³/min) for each heterogeneous model (SL, SS, LL, LS, LLM, and LLL) to compare the flushing processes in different flow regimes. First, we verified the validity of our experiments by comparing the results of the H model from an analytical solution with our experiment. The results of the high-contrast models showed that for a diffusion-dominated regime (Q = 0.6 cm³/min), the pore volume injected (PVI) required to flush out solute mass was much smaller than that in an advection-dominated regime (Q = 26 cm³/min). To evaluate the pore volumes required to flush out solutes for the four high-contrast models, we introduced a parameter P₀.₀₁, which is defined as the PVI needed for the relative concentration to become 0.01 at the middle of the low-K zone. P₀.₀₁ decreases with increasing the specific surface area of the low-K zone for diffusion-dominated regimes, while it increases with increasing the length of the low-K zone for advection-dominated regimes. We also determined the importance of the effect of K contrast on solute retention by comparing the results of three different models of K contrast (LL, LLM, and LLL).

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Laboratory Flushing Tests of Dissolved Contaminants in Heterogeneous Porous Media with Low-Conductivity Zones

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Laboratory Flushing Tests of Dissolved Contaminants in Heterogeneous Porous Media with Low-Conductivity Zones

概要

この論文で使われている画像

関連論文

Sedimentation Turbulence Observed in Flocculated Na-montmorillonite in the Semi-dilute Regime

Project 1 Development on Neutron Imaging Application (R4P1)

カーボンフリーエネルギー変換に関連する気泡発生を伴う液相プロセスにおける熱・物質輸送の促進法に関する研究

<Advanced Energy Conversion Division> Advanced Laser Science Research Section

Effect of beam current on defect formation by high-temperature implantation of Mg ions into GaN

参考文献