LABOLATORY EXPERIMENT AND NUMERICAL SIMULATION FOR SOLUTE TRANSPORT IN HETEROGENEOUS-UNSATURATED VERTICAL INFILTRATION FLOW FIELD

• SAITO Masahiko

  神戸大学 自然科学系先端融合研究環 重点研究部

• NAKAGAWA Kei

  鹿児島大学 農学部 生物環境学科

Bibliographic Information

Other Title

• 不飽和・不均一鉛直浸透場の物質移動現象に関する室内実験と数値シミュレーション

Abstract

  Vertical water infiltration in a heterogeneous-unsaturated flow field was generated through a small rainfall simulator. Solute transport characteristics with cation exchange reaction in this flow field were investigated. Temporal changes of electric conductivity and concentrations of cations and anions in the leachate accumulated at the bottom of the laboratory flow tank were observed. Macroscopic characteristics of solute transport were evaluated with a theoretical solution of the one-dimensional convective-dispersive equation. Dye tracing technique was used to investigate detailed behavior of the solute. Numerical simulation of the saturated-unsaturated infiltration analysis and convective-dispersive analysis were conducted to reproduce the lab-experiment. The heterogeneity of the water retention characteristics heavily affects solute movement. As such, power law decay of the concentration was clearly observed. Temporal change of cation concentration was difficult to reproduce using the linear adsorption model. However it can be reproduced using nonlinear adsorption isotherms of Freundlich type which considered the difference of the soil configuration.

Journal

• Doboku Gakkai Ronbunshuu B

  Doboku Gakkai Ronbunshuu B 66 (3), 248-257, 2010

  Japan Society of Civil Engineers

Keywords

• heterogeneous field
• infiltration
• TDR
• image analysis
• numerical simulation
• two-phase
• flow analysis

Details

• CRID: 1390282680230227840
• NII Article ID: 130004468113
• DOI: 10.2208/jscejb.66.248
• ISSN: 18806031
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed