CALL FOR PROPOSALS:

ORGANIZERS

  • Harvey Thorleifson, Chair
    Minnesota Geological Survey
  • Carrie Jennings, Vice Chair
    Minnesota Geological Survey
  • David Bush, Technical Program Chair
    University of West Georgia
  • Jim Miller, Field Trip Chair
    University of Minnesota Duluth
  • Curtis M. Hudak, Sponsorship Chair
    Foth Infrastructure & Environment, LLC

 

Paper No. 9
Presentation Time: 10:30 AM

MODELING FLOW INTO HORIZONTAL WELLS IN A DUPUIT-FORCHHEIMER MODEL


HAITJEMA, Henk, SPEA Bldg 254B, 1315 E 10th St, Bloomington, IN 47405-1701, KUZIN, Sergey, V.N. Karazin Kharkiv National University, Svobody Sq. 4, Kharkiv, 61077, Ukraine, KELSON, V., Layne Christensen Company, 320 West 8th Street, Showers Plaza, Suite 201, Bloomington, IN 47404-3700 and ABRAMS, Daniel B., Illinois State Water Survey, Prairie Research Institute, 2204 Griffith Dr, Champaign, IL 61820, haitjema@indiana.edu

Horizontal wells or radial collector wells are used in shallow aquifers to enhance water withdrawal rates. Groundwater flow patterns near these wells are three-dimensional, but difficult to represent in a 3D numerical model because of the high degree of grid refinement needed. However, for the purpose of designing water withdrawal systems it is sufficient to obtain the correct production rate of these wells for a given drawdown. We developed a Cauchy boundary condition along a horizontal well in a Dupuit-Forchheimer model. Such a steady state 2D model is not only useful for predicting groundwater withdrawal rates, but also for capture zone delineation in the context of source water protection. A comparison of our Dupuit-Forchheimer model for a radial collector well with a three-dimensional model yields a nearly exact production rate. Particular attention is given to horizontal wells that extend underneath a river. A comparison of our approach with a 3D solution for this case yields satisfactory results, at least for moderate to large river bottom resistances.
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