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Correcting transit time distributions in coarse MODFLOW-MODPATH models.

Daniel Abrams1

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

Ground Water
|September 15, 2012
PubMed
Summary
This summary is machine-generated.

Particle transit times in MODFLOW models are often inaccurate due to large sink cell areas. Scaling these transit times during post-processing can improve watershed pollution assessments.

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Area of Science:

  • Hydrology
  • Hydrogeology
  • Environmental Modeling

Background:

  • Low to medium resolution MODFLOW models often represent streams with sink cells that occupy a disproportionately large area.
  • This overestimation leads to inaccuracies in particle-tracking simulations using MODPATH, affecting calculated particle traces and transit times.
  • Inaccurate transit time distributions can compromise assessments of nonpoint source pollution impacts on surface water and groundwater.

Purpose of the Study:

  • To address inaccuracies in particle transit time calculations in MODFLOW models.
  • To improve the reliability of watershed-wide transit time distributions used for pollution impact assessments.
  • To propose a post-processing method to correct transit time errors without increasing model resolution.

Main Methods:

  • Particle transit times were analyzed in MODFLOW models with large sink cell representations.
  • The study focused on post-processing techniques to adjust calculated particle transit times.
  • An adjustment factor was developed for scaling transit times to improve frequency distributions.

Main Results:

  • Particle traces and transit times calculated by MODPATH are inaccurate when sink cell areas are overestimated.
  • Frequency distributions of watershed transit times are consequently erroneous.
  • Scaling particle transit times by an adjustment factor in post-processing can correct these distribution errors.

Conclusions:

  • While high model resolution is ideal, post-processing adjustments offer a viable method to improve transit time accuracy in existing MODFLOW models.
  • The proposed scaling method enhances the utility of transit time distributions for evaluating nonpoint source pollution.
  • Accurate transit time data is crucial for understanding contaminant transport and protecting water resources.