Dip and Anisotropy Effects on Flow Using a Vertically Skewed Model Grid

John R. Hoaglund, David Pollard

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Darcy flow equations relating vertical and bedding-parallel flow to vertical and bedding-parallel gradient components are derived for a skewed Cartesian grid in a vertical plane, correcting for structural dip given the principal hydraulic conductivities in bedding-parallel and bedding-orthogonal directions. Incorrect-minus-correct flow error results are presented for ranges of structural dip (0 ≤ θ ≤ 90) and gradient directions (0 ≤ φ ≤ 360). The equations can be coded into ground water models (e.g., MODFLOW) that can use a skewed Cartesian coordinate system to simulate flow in structural terrain with deformed bedding planes. Models modified with these equations will require input arrays of strike and dip, and a solver that can handle off-diagonal hydraulic conductivity terms.

Original languageEnglish (US)
Pages (from-to)841-846
Number of pages6
JournalGround water
Issue number6
StatePublished - Nov 1 2003

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Computers in Earth Sciences


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