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Area of Science:

  • Hydrogeology
  • Numerical Modeling
  • Environmental Engineering

Background:

  • Axisymmetric groundwater models are crucial for simulating radial flow conditions, often used in aquifer tests.
  • Traditional numerical models like MODFLOW struggle with axisymmetric simulations due to structured grids.
  • Previous work involved manipulating aquifer properties to approximate axisymmetric conditions.

Purpose of the Study:

  • To present a novel methodology for simulating axisymmetric groundwater flow using MODFLOW-USG.
  • To leverage the unstructured grid capabilities of MODFLOW-USG for axisymmetric modeling.
  • To demonstrate the versatility of this approach for various hydrogeological scenarios.

Main Methods:

  • Utilized MODFLOW-USG's unstructured grid framework to create axisymmetric models.
  • Calculated intercell interface area arrays to accurately represent coaxial cylindrical cells.
  • Developed and tested models for pumping wells, vadose zone infiltration, and saltwater intrusion.

Main Results:

  • Successfully simulated axisymmetric conditions within the MODFLOW framework using MODFLOW-USG.
  • Demonstrated accurate modeling of delayed yield pumping, infiltration, and density-dependent flow.
  • Verified results against analytical solutions and existing numerical codes.

Conclusions:

  • MODFLOW-USG provides a flexible and effective platform for axisymmetric groundwater modeling.
  • The presented methodology overcomes limitations of traditional structured-grid models.
  • This approach enhances the simulation capabilities for radially symmetric hydrogeological problems.