Natural and Enhanced Attenuation of Chlorinated Solvents Using RT3D

Abstract

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RT3D Reaction Modules for Natural and Enhanced Attenuation of Chloroethanes, Chloroethenes, Chloromethanes, and Daughter Products

“…Reaction parameters may be defined as spatially constant or spatially variable, depending on site conditions and the available information. For instance, if multiple geochemical settings (as discussed in Johnson et al [2006]) are identified within the model domain, the parameters in one area can be set to different values than for another area. Reaction parameter values can vary spatially because of differences in geochemistry (e.g., concentrations/types of electron acceptors, anaerobic/anoxic/aerobic setting), temperature, substrate availability, and microbial population (in terms of both numbers of bacteria and types of bacteria).…”

“…RT3D is a numerical code for simulating three-dimensional multi-species reactive transport in groundwater for a user-configured site model [Clement, 1997;Clement et al, 1998;Clement and Johnson, 2002;Johnson et al, 2006]. RT3D can provide information to help analyze the relative importance of different fate and transport processes at an individual site and assess the plume in terms of a mass balance approach.…”

“…The RT3D code solves a system of reactive transport equations for the tracked chemical species using an operator-split strategy to uncouple the advection, dispersion, source/sink mixing, and reaction terms of the governing transport equations [Johnson and Truex, 2006]. These separate terms are encapsulated in so-called "Packages," which delineate portions of the code as well as the required data input.…”

Developing an Mna Modeling Tool Based on Rt3d: 3 Reports

“…Site-specific knowledge from field data or laboratory tests should be applied to determine an appropriate model configuration for reaction parameters (i.e., the values and the spatial distribution). RT3D is a numerical code for simulating three-dimensional multi-species reactive transport in groundwater Johnson et al, 2006a]. RT3D can provide information to help analyze the relative importance of different fate and transport processes at an individual site and assess the plume in terms of a mass balance approach.…”

“…The user is assumed to be familiar with both MODFLOW and RT3D Johnson et al, 2006a] as well as the process of defining a model, running the numerical codes, and accessing the resultant output. While MODFLOW and RT3D models are often configured and run from within a third party graphical user interface such as GMS , Visual Modflow , PMWIN , or Groundwater Vistas , the rtFlux software runs external to these groundwater modelling software packages.…”