Circular Isobaric Cavity in Descending Unsaturated Flow

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10 Citations (Scopus)


Two-dimensional flows near cavities were studied by superposition of the Philip solution for an isobaric cylindrical cavity in an infinite unsaturated soil and vertical infiltration. Depending on the radius of the cavity and the intensity of the net infiltration, the cavity irrigates the surrounding soil forming a plume of seeping moisture (source regime), drains the descending infiltration forming a capture zone (sink regime), or admits water through its upper section and releases water through its bottom (dipole regime). The separatrices, i.e., the lines, which divide the incoming, outgoing, and passing-by portions of the flow, were found. For the dipole regime, the values of flow rates through the admitting and releasing sections of the cavity and streamlines were calculated. The supercritical flow regime is characterized by a permeable blunt upstream section of the cavity and watertight downstream segments. For elongated cavities, this regime was modeled as a combination of a permeable isobaric segment and a part of the adjacent separatrice. Analogies with saturated flows in confined aquifers near a circular constant head boundary and with contaminant transport from a circular isoconcentric source were discussed.

Original languageEnglish
Pages (from-to)172-178
Number of pages7
JournalJournal of Irrigation and Drainage Engineering
Issue number3
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Agricultural and Biological Sciences (miscellaneous)


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