We define mass flux, J as the product of the Darcy flux (sometimes called Darcy velocity, see Advection and Groundwater Flow), q, and the local concentration of contaminant, C, in the aqueous phase: Units are mass/time (typically g/day or kg/yr).Ĭonsider a simplified site involving a contaminant source from which mass is removed under natural gradient groundwater flow, generating a much larger dissolved contaminant plume. The area of interest is generally large enough to contain the entire plume. Mass discharge is the total mass of contaminant moving across a control plane of interest, such as the downgradient edge of the source zone or a property boundary. Mass flux is defined as the contaminant mass moving across a unit area of porous media (aquifer) perpendicular to the groundwater flow direction and has units of mass/area/time (typically g/m 2/day). This information can be valuable during all phases of site management, including risk assessment, quantifying natural and enhanced attenuation processes, remedial performance assessment, and measuring loads to surface water bodies. Ĭharacterization methods have been developed to measure contaminant mass flux and mass discharge at contaminated sites. Field-scale evaluation of the passive flux meter for simultaneous measurement of groundwater and contaminant fluxes.Changes in contaminant mass discharge from DNAPL source mass depletion: Evaluation at Two Field Sites. 6 Source Zone Models that Link Mass Depletion, Mass Flux/DischargeĬontributor(s): Dr.5 Using Mass Discharge for Evaluating Risk.3 Methods for Mass Discharge and Mass Flux Measurement.
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