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Estimating recharge rates with analytic element models and parameter estimation.

W R Dripps1, R J Hunt, M P Anderson

  • 1Department of Earth and Geographic Sciences, University of Massachusetts, Boston, MA 02125, USA. weston.dripps@umb.edu

Ground Water
|January 13, 2006
PubMed
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This study quantifies groundwater recharge distribution using analytic element modeling. Spatially distributed recharge, influenced by vegetation, is crucial for accurate groundwater flow modeling.

Area of Science:

  • Hydrology
  • Hydrogeology
  • Environmental Modeling

Background:

  • Effective groundwater flow modeling requires accurate quantification of spatial and temporal recharge.
  • Traditional methods may oversimplify recharge estimation, leading to model discrepancies.

Purpose of the Study:

  • To quantify the spatial and temporal distribution of groundwater recharge.
  • To evaluate the utility of analytic element (AE) modeling linked with parameter estimation for recharge estimation.

Main Methods:

  • Utilized an analytic element (AE) code (GFLOW) integrated with a nonlinear parameter estimation code (UCODE).
  • Optimized an AE flow model using measured base flows as calibration targets for an undeveloped Wisconsin watershed.
  • Compared recharge estimates assuming constant distributed rates versus spatially distributed zones based on vegetation types.

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Main Results:

  • Initial models with constant recharge showed good but imperfect matches to base flows.
  • Allowing for spatially distributed recharge zones based on vegetation improved model fit.
  • Annual recharge varied significantly, influenced by nonclimatic factors, demonstrating interannual variability.

Conclusions:

  • Analytic element modeling offers a flexible and effective approach for estimating groundwater recharge.
  • Spatially distributed recharge, influenced by factors like vegetation, is essential for accurate regional flow modeling.
  • Linked AE-parameter estimation codes provide a valuable tool for understanding groundwater recharge dynamics.