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INNOVATIVE CONTAMINANT MASS FLUX MONITORING IN AN AQUIFER SUBJECT TO TIDAL EFFECTS
Jamin, P., F. Cosme, P. Briers, P. Orban, K. De Greene, and S. Brouyere.
Groundwater Monitoring & Remediation [Published online 14 January 2020 prior to print]

Finite volume point dilution method (FVPDM) tests were undertaken continuously for more than 48 hours at 6 groundwater monitoring wells to evaluate groundwater flow dynamics and characterize highly transient groundwater flows and contaminant mass fluxes within a coastal groundwater flow system during several tide cycles. Contaminant concentrations were measured simultaneously to calculate contaminant mass fluxes. The study highlighted the importance of the aquifer heterogeneity, with groundwater fluxes ranging from 10-7 to 10-3 m/s. Groundwater flux monitoring enabled a significant refinement of the conceptual site model, including the observation that inversion of groundwater fluxes was not observed at high tide. Results indicated that contaminant mass fluxes were particularly higher at a specific monitoring well by more than 3 orders of magnitude than at other wells of the investigated aquifer. This study provided crucial information for optimizing further field investigations and risk mitigation measures



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