THEORY OF UNSATURATED FLOW INTO A NON-UNIFORM SOIL PROFILE

This qualitative and analytic description of the flow of water through a layered soil, considers two types of soil profile: a profile of distinct layers, each of which has uniform conductivity, and a gradually varying profile. Each profile is assumed to have a well-defined phreatic surface somewhere below. Both a downward vertical flow and a sidewise or horizontal flow are considered. The conditions that would cause a transition from a saturated to an unsaturated flow, and those that would cause a transition from an unsaturated to a saturated flow are investigated. The shape of the flow is derived qualitatively. Unsaturated flow occurs when the water head at the soil surface is low and when the hydraulic resistance near the point of water entry is high. Saturated flow occurs under high water heads and low resistance at the point of entry. The shape of the pressure distribution with depth is analyzed (vertical flow and diagonal flow), and the conditions for making perched water horizon are stated.

  • Corporate Authors:

    Lippincott Williams & Wilkins

    428 East Preston Street
    Baltimore, MD  United States  21202
  • Authors:
    • Zaslavsky, D
  • Publication Date: 1964-6

Media Info

  • Features: Figures; References;
  • Pagination: p. 400-409
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00263289
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM