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Reactive contaminant transport simulation using the analytic element method, random walk particle tracking and kernel

Partha Majumder1, T I Eldho1

  • 1Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India.

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|March 11, 2019
PubMed
Summary

This study introduces a new simulation model for groundwater contamination. The analytic element method-random walk particle tracking-kernel density estimator (AEM-RWPT-KDE) model accurately simulates contaminant transport and decay in aquifers.

Keywords:
Kernel density estimator (KDE)Radioactive decay, aAnalytic element method (AEM)Random walk particle tracking (RWPT)

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Area of Science:

  • Environmental science
  • Hydrogeology
  • Computational modeling

Background:

  • Groundwater contamination poses significant environmental risks.
  • Accurate simulation of contaminant transport is crucial for effective remediation strategies.
  • Existing Eulerian models often suffer from numerical dispersion.

Purpose of the Study:

  • To develop and validate a novel simulation model for two-dimensional groundwater flow and advection-dispersion-reaction.
  • To couple the analytic element method (AEM), random walk particle tracking (RWPT), and kernel density estimator (KDE) for enhanced accuracy and efficiency.
  • To simulate the transport of specific contaminants, Radium-228 and Trichloroethene (TCE), in hypothetical aquifer scenarios.

Main Methods:

  • Coupling of AEM for groundwater flow and RWPT for solute transport.
  • Integration of KDE to improve RWPT accuracy and computational speed.
  • Incorporation of analytic expressions for radioactive decay and linear adsorption within the RWPT framework.
  • Validation against analytical solutions and comparison with Eulerian-Lagrangian models.

Main Results:

  • The AEM-RWPT-KDE model demonstrated superior accuracy compared to existing Eulerian-Lagrangian models.
  • RWPT method proved to be free from numerical dispersion, a common issue in Eulerian transport models.
  • Simulations of Radium-228 and Trichloroethene transport in hypothetical aquifers confirmed the model's practical applicability.
  • The model successfully simulated radioactive decay and linear adsorption processes.

Conclusions:

  • The proposed AEM-RWPT-KDE model offers a robust and accurate approach for simulating groundwater flow and contaminant transport.
  • This methodology provides a valuable tool for assessing and managing groundwater contamination risks.
  • The model's ability to handle complex processes like radioactive decay and adsorption enhances its utility in real-world hydrogeological studies.