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Related Experiment Videos

Selecting MODFLOW cell sizes for accurate flow fields.

H Haitjema1, V Kelson, W de Lange

  • 1SPEA 439, Indiana University, Bloomington 47405, USA. haitjema@indiana.edu

Ground Water
|November 16, 2001
PubMed
Summary
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Accurate groundwater contaminant transport modeling requires fine grid spacing in MODFLOW simulations. Insufficient cell resolution leads to errors in flow rates, particle traces, and travel times, impacting advective transport predictions.

Area of Science:

  • Hydrogeology
  • Environmental Engineering
  • Computational Modeling

Background:

  • Contaminant transport models often rely on groundwater flow fields generated by MODFLOW.
  • The accuracy of these transport predictions is directly linked to MODFLOW's representation of groundwater flow, especially for advective transport.

Purpose of the Study:

  • To assess the accuracy of MODFLOW groundwater flow rates and MODPATH particle traces (advective transport) under various conditions.
  • To determine the impact of grid spacing on the reliability of groundwater flow and transport simulations.

Main Methods:

  • Comparison of MODFLOW and MODPATH results against analytical solutions for flow in confined or semiconfined aquifers.
  • Numerical experiments were conducted using diverse conceptual models and varying grid spacings.

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Main Results:

  • MODFLOW demonstrated robustness in water balance calculations.
  • Accurate groundwater flow rates, particle traces, and travel times were achieved only with sufficiently small grid cells.
  • Specific cell density requirements were identified for modeling inflows to surface water bodies and zones of differing transmissivities.
  • Maximum cell dimensions were related to a characteristic leakage length (lambda) for accurate representation of aquitard leakage.

Conclusions:

  • Adequate grid resolution is critical for accurate groundwater flow and advective contaminant transport modeling using MODFLOW.
  • Modelers must carefully consider cell size relative to hydrogeological features like narrow tributaries and transmissivity zones.
  • Leakage representation necessitates cell dimensions constrained by the characteristic leakage length to ensure reliable transport predictions.