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Transport in Porous Media

, Volume 92, Issue 1, pp 83–100 | Cite as

Observation of Light Non-Aqueous Phase Liquid Migration in Aggregated Soil Using Image Analysis

  • Su Kong NgienEmail author
  • Norhan Abd. Rahman
  • Mustafa M. Bob
  • Kamarudin Ahmad
  • Radzuan Sa’ari
  • Roland W. Lewis
Article

Abstract

Physical model experiments were conducted to observe the migration of light non-aqueous phase liquids (LNAPL) in a double-porosity soil medium. The double-porosity characteristics of the soil were simulated through aggregation of kaolin which resulted in well-defined intra-aggregate and inter-aggregate pores. Digital images were collected to monitor LNAPL (modeled by toluene) migration. A special experimental setup was developed to enable the instantaneous capture of the LNAPL migration around the whole soil column using a single digital camera. An image processing module was applied to the captured images and the results plotted using a surface mapping programme. Events observed during the duration of the experiments were discussed. It was found that the LNAPL flowed much faster in the aggregated soil as compared to a single-porosity soil. The wettability of the fluid and the capillary pressure characteristics were demonstrated to be influential factors in immiscible fluids migration when the soil fabric showed highly contrasting porosity values.

Keywords

Double-porosity Image analysis Non-aqueous phase liquids Unsaturated soil 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Su Kong Ngien
    • 1
    Email author
  • Norhan Abd. Rahman
    • 1
    • 2
  • Mustafa M. Bob
    • 2
  • Kamarudin Ahmad
    • 1
  • Radzuan Sa’ari
    • 1
  • Roland W. Lewis
    • 3
  1. 1.Faculty of Civil EngineeringUniversiti Teknologi MalaysiaUTM SkudaiMalaysia
  2. 2.College of EngineeringTaibah UniversityMadinahKingdom of Saudi Arabia
  3. 3.School of EngineeringSwansea UniversitySwanseaUK

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