Experimental techniques for laboratory investigation of clay colloid transport and filtration in a stream with a sand bed

Aaron I. Packman*, Norman H. Brooks, James J. Morgan

*Corresponding author for this work

Research output: Contribution to journalConference article

23 Scopus citations

Abstract

The exchange of kaolinite clay between a stream and its associated sand bed was investigated in a recirculating flume. Bedforms at the sediment- water interface result in two bed-exchange mechanisms: the bedform shape induces an advective flow through the bed ('pumping'), and dune propagation causes the trapping and release of pore water ('turnover'). Chemical and electrostatic interactions then result in filtration of clay by the bed. In order to allow modelling of chemical effects, all flume materials must have defined chemical parameters. This required improvements in the flume water supply, construction of sand-washing equipment, and the use of defined clay and sand preparation procedures. Flume experimental results indicate that clay is extensively trapped by the bed. Advective pumping tends to carry clay to the deep bed where it can be permanently trapped, while turnover tends to continuously mix the upper layers the bed, hindering penetration to the deep bed.

Original languageEnglish (US)
Pages (from-to)113-122
Number of pages10
JournalWater, Air, and Soil Pollution
Volume99
Issue number1-4
DOIs
StatePublished - Oct 1 1997
EventProceedings of the 1996 7th International Symposium on the Interactions Between Sediments and Water - Baveno, Italy
Duration: Sep 22 1996Sep 25 1996

Keywords

  • Bed exchange
  • Bedform
  • Colloid
  • Filtration
  • Flume
  • Hyporheic
  • Kaolinite
  • Pumping
  • Stream
  • Turnover

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Ecological Modeling
  • Water Science and Technology
  • Pollution

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