CCD camera image analysis for mapping solute concentrations in saturated porous media

Stefanie Jaeger, Markus Ehni, Christina Eberhardt, Massimo Rolle, Peter Grathwohl, Guenter Gauglitz

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents an optical approach, based on the use of a low-cost charge-coupled device (CCD) camera, for the quantitative determination of solute concentrations in saturated porous media. The method is applied to evaluate tracer experiments carried out in a laboratory model tank. The CCD photos deliver RGB values which are transferred into concentrations for the evaluation of vertical concentration profiles over the whole tank area. A specially developed evaluation procedure, including internal referencing for noise reduction, considers the colour of the adjacencies of the evaluated spots and scattering effects. The CCD data evaluation technique is accompanied by conventional sampling and absorption measurements and by numerical flow and transport simulations. This non-invasive technique allows a direct mapping of the concentration distribution without any disturbance of the solute plume. Therefore, it turns out to be an important tool for a detailed investigation of fundamental processes (e.g. transverse dispersion) determining the solute (e.g. contaminant) transport in porous media.
Original languageEnglish
JournalAnalytical and Bioanalytical Chemistry
Volume395
Issue number6
Pages (from-to)1867-1876
Number of pages10
ISSN1618-2642
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Analytical Chemistry
  • Biochemistry
  • Colour tracer
  • Imaging
  • Numerical modelling
  • Optical sensor
  • Porous media
  • Absorption measurements
  • Concentration distributions
  • Concentration profiles
  • Data evaluation
  • Direct mapping
  • Laboratory models
  • Noise reductions
  • Noninvasive technique
  • Numerical flow
  • Quantitative determinations
  • Saturated porous media
  • Scattering effects
  • Solute concentrations
  • Solute plumes
  • Tracer experiment
  • Transport in porous media
  • Transverse dispersion
  • Cameras
  • Color
  • Concentration (process)
  • Digital cameras
  • Image analysis
  • Optical sensors
  • Simulators
  • Tanks (containers)
  • Porous materials
  • BIOCHEMICAL
  • CHEMISTRY,
  • DISPERSION COEFFICIENTS
  • LABORATORY EXPERIMENTS
  • TRANSVERSE DISPERSION
  • TRANSPORT
  • PLUME
  • BIODEGRADATION
  • DISTRIBUTIONS
  • VISUALIZATION

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