Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

01.07.2011 | Original Article | Ausgabe 5/2011

Environmental Earth Sciences 5/2011

Multi-scale characterisation of coastal sand aquifer media for contaminant transport using X-ray computed tomography

Zeitschrift:
Environmental Earth Sciences > Ausgabe 5/2011
Autoren:
R. Dann, M. Turner, M. Close, M. Knackstedt
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s12665-010-0788-8) contains supplementary material, which is available to authorized users.

Abstract

To be able to predict contaminant transport in groundwater, an accurate conceptual and physical understanding of aquifer properties at multiple scales is required. In this study, physical and hydraulic properties of a coastal sand aquifer were derived using micro and macro X-ray computed tomography (XCT) techniques. Qualitative and quantitative data improved conceptualisation of the aquifer structure at micro and macro scale. At the macro scale (50-mm diameter by 1,500-mm long core) XCT images of undisturbed drill core identified coarse grained laminae (not obvious to the naked eye) of increased porosity and permeability, variations in mineral assemblage and particulate organic matter distribution within the core. Micro-XCT analysis (16-mm diameter cores) of the three main aquifer layers provided quantitative micro-scale data on permeability, porosity, grain, pore and throat size distribution statistics, and grain sphericity. Ratios of mean pore to grain diameter were ~0.65–0.75 and ratios of mean throat to mean grain diameter were ~0.2. Multiple permeability and porosity values were derived from micro domains (~4.35 mm3) within each micro-XCT core. Permeability values varied between and within micro-XCT core samples reflecting the heterogeneity at the millimetre core scale in these sediments. Sphericity values were similar for all three layers (average ~0.4) which reflected SEM observations of the semi-spherical nature of the dominant quartz and feldspar grains. The results of this study indicate that models based on the assumptions of homogeneity in depositional structure below centimetre scale may not suitably address factors affecting flow and transport of contaminants.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

  • über 69.000 Bücher
  • über 500 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Finance + Banking
  • Management + Führung
  • Marketing + Vertrieb
  • Maschinenbau + Werkstoffe
  • Versicherung + Risiko

Testen Sie jetzt 30 Tage kostenlos.

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

  • über 50.000 Bücher
  • über 380 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Maschinenbau + Werkstoffe​​​​​​​




Testen Sie jetzt 30 Tage kostenlos.

Zusatzmaterial
Supplementary material 1 (DOC 9009 kb)
12665_2010_788_MOESM1_ESM.doc
Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 5/2011

Environmental Earth Sciences 5/2011 Zur Ausgabe