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On modeling weak sinks in MODPATH.

Daniel Abrams1, H Haitjema, L Kauffman

  • 1School of Public and Environmental Affairs, Indiana University SPEA 412, Bloomington, IN 47405, USA. dbabrams@indiana.edu

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This summary is machine-generated.

Groundwater flow models can simulate strong and weak sinks. Accurately modeling weak sinks in particle tracking requires careful parameterization, especially for wells, to determine capture zones and travel times.

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Area of Science:

  • Hydrogeology
  • Numerical modeling of groundwater flow systems

Background:

  • Regional groundwater flow systems comprise strong and weak sinks, differing in their extraction of water across aquifer depths.
  • Numerical models like MODFLOW and MODPATH are used to simulate groundwater flow and particle transport, but their representation of sink types can vary in accuracy.

Purpose of the Study:

  • To evaluate the accurate representation of strong and weak sinks in numerical groundwater flow and particle tracing models.
  • To investigate the specific challenges and necessary parameterizations for modeling weak sink wells and their associated capture zones.

Main Methods:

  • Analysis of sink cell behavior within the MODFLOW groundwater flow model.
  • Assessment of particle tracing accuracy using MODPATH for weak sink streams and wells.
  • Examination of parameterization effects on particle traces, travel times, and capture zones.

Main Results:

  • Both strong and weak sinks can be represented by strong or weak sink cells in MODFLOW, with weak sink cells often used in low-resolution models.
  • MODPATH requires appropriate parameterization to accurately model particle travel times to weak sink streams, even in single-layer models.
  • Weak sink well cells necessitate specific modeling approaches for accurate particle traces, travel times, and capture zone delineation.

Conclusions:

  • Accurate simulation of weak sinks, particularly wells, is crucial for understanding groundwater flow dynamics and contaminant transport.
  • Transit time distributions for well water are generally reliable in homogeneous aquifers where wells extract from the entire depth, simplifying contaminant response analysis.
  • The study highlights the importance of appropriate model parameterization for reliable predictions of groundwater flow system behavior and well capture zones.