Transmission and Redistribution of the Negative Pressure in Soil : Experimental studies on the New Subsurface Drainage Method by the Use of Negative Pressure II

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概要

• 論文の詳細を見る

• The previous paper presented the negative pressure drainage method. This method is to such and drain the soil water forcibily through porous materials by using the negative pressure of the water. In the present paper, experiments of a one dimensional vertical soil column and of a small scale model at the experimental field were carried out and the transmission and redistribution of the pressure in the coil were discussed. The following were made clear.(1) In vertical system, the negative pressure drainage given the pressure head Hp, negative, at the height χ has the same effects as the water table is lowered and kept at the height χ+Hp in the gravity drainage.(2) The lower the permeability of the porous material is, compared to that of the soil, the less the efficiency of the pressure transmission and drainage discharged are. From two dimensional steady-state drainage analyses, the maximum discharge is obtained employing the relation between hydraulic conductivity and anti-air permeability of the porous material.(3) For a full scale project of this drainage method on farms, technical problems of the construction and maintenance still remain to be solved.

• 大阪府立大学の論文
• 1982-03-31

著者

• OGINO Yoshihiko

  Graduate School of Agriculture and Biological Sciences Osaka Prefecture University

• Ogino Yoshihiko

  Laboratory Of Irrigation And Environmental Engineering College Of Agriculture Osaka Prefecture Unive

• Yabe K

  Osaka Prefecture Univ.

• Yabe Katsuhiko

  Laboratory Of Irrigation And Environment Engineering College Of Agriculture

• Murashima K

  Ishikawa Agriculture Junior College

• Murashima Kazuo

  Laboratory Of Utilization Of Water In Agriculture College Of Agriculture

• TEJIMA Sanji

  Laboratory of Utilization of Water in Agriculture, College of Agriculture

• Tejima Sanji

  Laboratory Of Utilization Of Water In Agriculture College Of Agriculture

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