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mass transport model

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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
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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.