SATURATION-UNSATURATION TRANSITION IN INFILTRATION TO A NON- UNIFORM SOIL PROFILE

A BRIEF REVIEW IS PRESENTED OF THE PROBLEM OF STEADY INFILTRATION INTO SOIL. EXPERIMENTS FOR DETERMINING THE TRANSITION FROM UNSATURATED TO SATURATED SOIL WERE CONDUCTED IN A COLUMN OF SAND, INSTALLED WITH A SERIES OF TENSIOMETERS. DIRECT MEASUREMENTS SHOWED THAT THE HYDRAULIC CONDUCTIVITY IN THE COLUMN WAS NOT UNIFORM. THE COLUMN WAS TREATED AS A GRADUALLY VARYING PROFILE ACCORDING TO THE GIVEN EQUATIONS. THE EXPERIMENTS CLEARLY DEMONSTRATE THE VALIDITY OF THE THEORY OF TRANSITION. IT WAS SHOWN THAT THE PRESENCE OF GROUND WATER DOES NOT INFLUENCE THE INFILTRATION RATE IN ANY WAY, UNLESS IT COMES VERY NEAR THE INTERFACE BETWEEN LAYERS. IT IS CONCLUDED THAT IN THE PRESENCE OF CONTROLLED LAYERS AT THE SURFACE, MEASUREMENTS WITH INFILTRATION RINGS NEED NO BUFFERING AT THE CIRCUMFERENCE TO PRESERVE VERTICAL FLOW. INFILTRATION RATE IS UNAFFECTED BY THE FLOW DIVERGENCE BELOW THE CONTROL LAYER. THE CONCEPT OF A CONTROL LAYER AT THE POINT OF WATER ENTRY MAY BE QUALITATIVELY EXTENDED TO TWO DIMENSIONAL AND THREE DIMENSIONAL FLOW. A FIGURE IS PRESENTED WHICH ENABLES ONE TO DEFINE SOME EQUIVALENT LAYER OF FLOW RESISTANCE AND AN EQUIVALENT HYDRAULIC CONDUCTIVITY. THIS APPROACH IS USEFUL FOR EVALUATING LEAKAGE FROM RESERVOIRS WITH COMPLEX TOPOGRAPHY AND FOR COMPUTING INFILTRATION RATES IN AREAS OF ARTIFICIAL GROUND WATER RECHARGE.

  • Supplemental Notes:
    • Vol 107, No 3, PP 160-165, 5 FIG, 9 REF
  • Authors:
    • Zaslavsky, D
  • Publication Date: 1969-3

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  • Accession Number: 00235461
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 19 1994 12:00AM