The properties of a water-table rise produced by a one-dimen-sional, vertical, unsaturated flow

DOI JASI Web Site 8 Citations

Bibliographic Information

Other Title
  • 一次元鉛直不飽和浸透によって生じる水面上昇の特性
  • 1ジゲン エンチョク フホウワ シントウ ニ ヨッテ ショウジル スイメン ジ

Search this article

Abstract

Properties of a water-table rise are examined theoretically on the basis of a dimensionless form of a fundamental equation given by combining RICHARDS' equation with functional relationships of two soil properties (water retention and permeability). A steady flux of water is supplied to the surface of a soil column with an impermeable bottom, where the pressure head is in equilibrium in the initial condition. Physical conditions are represented by three dimensionless parameters. α is the ratio of φ0 to the height of the column where φ0 is the pressure head value when the specific moisture capacity has its maximum value. β is an exponent reflecting the relationship between hydraulic conductivity and moisture content. γ is the ratio of the saturated hydraulic conductivity to the flux of the supplied water. Time is made dimensionless in terms of the time when the water table reaches the surface of the column. Properties of the water-table rising with dimensionless time are specified by the effects of the parameters. If γ approaches infinity, the rising depends only on α. When the value of γ is finite, the rising is delayed. This is delayed also by a decreasing γ and/or an increasing β. Its delay is due to the increase of moisture content in the transmission zone and the decrease of the diffusion effects.

Journal

Citations (8)*help

See more

Details 詳細情報について

Report a problem

Back to top