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Updated: May 25, 2026

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
09:49

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation

Published on: November 18, 2015

Modeling urban films using a dynamic multimedia fugacity model.

Susan A Csiszar1, Miriam L Diamond, Louis J Thibodeaux

  • 1Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada.

Chemosphere
|January 28, 2012
PubMed
Summary
This summary is machine-generated.

Urban surface films act as temporary sinks or sources of organic pollutants. These films release chemicals to air in warm weather and to storm water during rain, impacting environmental pollutant levels.

Related Experiment Videos

Last Updated: May 25, 2026

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
09:49

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation

Published on: November 18, 2015

Area of Science:

  • Environmental Chemistry
  • Urban Ecology
  • Atmospheric Science

Background:

  • Impervious urban surfaces develop thin films containing organic pollutants.
  • These films can act as both sources and sinks for environmental contaminants.
  • Understanding film dynamics is crucial for assessing pollutant fate in urban areas.

Purpose of the Study:

  • To review recent developments in urban surface film and pollutant behavior.
  • To incorporate film dynamics into an unsteady-state Multimedia Urban Model (MUM).
  • To explore conditions under which urban films act as sources or sinks of pollutants.

Main Methods:

  • Review of scientific literature on urban surface films and pollutants.
  • Development of an unsteady-state fugacity-based Multimedia Urban Model (MUM).
  • Simulation of chemical (PCB congeners 28 and 180) behavior in urban surface films.

Main Results:

  • Urban surface films act as temporary sinks for chemicals from air in cool, dry weather.
  • Films transition to sources of chemicals to air in warmer weather.
  • During rain events, films act as sources to storm water and soil, with significant PCB transfer estimated in Toronto.

Conclusions:

  • Urban surface films play a dynamic role in the environmental fate of organic pollutants.
  • Film behavior is influenced by weather conditions, affecting pollutant partitioning.
  • The model quantifies pollutant transfer from air to film to storm water, highlighting urban pollutant cycling.