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2 results

  • 25 - Stagnant Zones

  • from PART II - REACTION PROCESSES
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 303-310

  • Summary

    In modeling the transport of chemical mass within flowing groundwater, the diffusion of chemical species into and out of stagnant zones within the domain can exert a controlling influence on the calculation results. This chapter shows how to incorporate the effect of stagnant zones on mass transport into a numerical flow and transport model. In a worked example, we show that the presence of stagnant zones can retard contaminant migration within an aquifer but lead to a strong tailing effect that interferes with environmental remediation.

  • 24 - Reactive Transport

  • from PART II - REACTION PROCESSES
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 289-302

  • Summary

    A reactive transport model is a simulation of the movement of chemical species in a flow regime, in which the species are allowed to react chemically. In this chapter, we derive a finite difference model of reactive transport in flowing groundwater, introduce the concept of a Damköhler number in the context of our model, show how the model can be evaluated numerically, and provide example calculations showing how such a model behaves.