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A Coupled Groundwater-Surface Water Modeling Framework for Simulating Transition Zone Processes.

Pradeep Mugunthan, Kevin T Russell1, Binglei Gong2

  • 1Anchor QEA, LLC, 290 Elwood Davis Road, Suite 340, Liverpool, NY 13088.

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This summary is machine-generated.

A new model integrates groundwater and surface water contaminant transport, improving the simulation of the crucial transition zone. This advancement aids in managing contaminated sediments and assessing risks from upland contaminant sources.

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Area of Science:

  • Environmental modeling
  • Hydrogeology
  • Contaminant fate and transport

Background:

  • Existing models lack dynamic coupling and do not fully represent groundwater-surface water transition zone processes.
  • Accurate simulation of transition zone processes is needed for effective management of contaminated sediments.

Purpose of the Study:

  • To develop and test a novel modeling framework for simulating contaminant fate and transport in the groundwater-surface water transition zone.
  • To enhance the representation of transition zone processes in contaminant modeling.

Main Methods:

  • Coupled Environmental Fluid Dynamics Code (EFDC) and SEAWAT models using an interface module.
  • Enhanced EFDC model (AQFATE) incorporating SEDZLJ for sediment transport.
  • Tested on a published problem and applied to field-scale contaminant transport evaluations.

Main Results:

  • Accurate simulation of salinity concentrations in a test case.
  • Excellent mass balance closure for the transition zone in field applications.
  • Consistent predictions with site-specific observations of contaminant migration.

Conclusions:

  • The developed modeling framework advances the simulation of transition zone processes.
  • This tool can inform risk assessments for sites with potential upland contaminant impacts on sediments and surface water.