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Watershed Planning within a Quantitative Scenario Analysis Framework
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Channel Geometry Controls on Chemical Behavior in Rivers: Insights from a Comparative Field Study.

Robert A Newbould1, D Mark Powell1, Juliet Hodges2

  • 1School of Geography, Geology and the Environment, University of Leicester, Leicester LE1 7RH, U.K.

ACS ES&T Water
|October 16, 2025
PubMed
Summary

River geomorphology impacts pollutant removal. Shallow rivers with smaller hydraulic radii show faster pollutant breakdown than deeper rivers, emphasizing the need to include channel shape in environmental models.

Keywords:
biodegradationchemical exposuredye tracinggeomorphologynitrificationwastewater

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Area of Science:

  • Environmental science
  • Riverine ecology
  • Water quality management

Background:

  • Microbial processes like nitrification and biodegradation are key to riverine pollutant removal.
  • In-stream removal rates are often assumed constant but may depend on river channel shape and size, influencing water-biofilm contact.

Purpose of the Study:

  • To test if pollutant transformation rate constants are inversely proportional to the hydraulic radius (R) of a river channel.
  • To investigate the influence of river geomorphology on in-stream pollutant removal efficiencies.

Main Methods:

  • Dye tracing experiments using rhodamine WT were conducted in two U.K. rivers (River Maun and River Calder) with contrasting hydraulic radii.
  • Rate constants for pollutants (sucralose, ammonium, caffeine, linear alkylbenzenesulfonate) were derived.
  • Sucralose was used as a conservative tracer to correct for dilution effects.

Main Results:

  • Higher rate coefficients for biotransformed pollutants were observed in the shallower River Maun (R=1.25m) compared to the deeper River Calder (R=3m).
  • Results support the hypothesis that transformation rate constants are inversely related to hydraulic radius.

Conclusions:

  • River channel geomorphology significantly influences the rate of microbially mediated pollutant removal.
  • Models predicting chemical behavior in rivers should incorporate geomorphological factors like hydraulic radius.