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Modeling Contaminant Microbes in Rivers During Both Baseflow and Stormflow.

J D Drummond1, T Aquino2, R J Davies-Colley3

  • 1University of Birmingham School of Geography, Earth & Environmental Sciences Birmingham UK.

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|July 22, 2022
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Summary
This summary is machine-generated.

A new model tracks contaminant microbes and particles in rivers. It shows how river flow and sediment interactions control their movement, crucial for understanding water contamination risks.

Keywords:
contaminant microbeshyporheicimmobilizationmobile immobile modelparticle tracking modelremobilization

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Area of Science:

  • Environmental Microbiology
  • Hydrology
  • Water Quality Modeling

Background:

  • Rivers are critical pathways for contaminant microorganism transport from various sources, posing significant public health risks.
  • Understanding the dynamics of microbial transport, immobilization, and remobilization is essential for effective water resource management.

Purpose of the Study:

  • To develop and validate a mobile-immobile model simulating contaminant microbe and particle transport in rivers.
  • To investigate the influence of baseflow and stormflow conditions, including hyporheic exchange, on microbial and particle dynamics.

Main Methods:

  • A mobile-immobile mathematical model was developed to simulate contaminant transport, immobilization, and remobilization.
  • The model incorporates hyporheic exchange processes during baseflow and stormflow.
  • Model predictions were validated against field observations of E. coli and turbidity during artificial and natural flood events.

Main Results:

  • The model accurately predicted the timing and magnitude of E. coli and turbidity during multiple high-flow events.
  • Hyporheic exchange was identified as a key mechanism for particle accumulation and slow remobilization during baseflow.
  • Stormflow significantly increased the remobilization of stored particles and associated contaminants.

Conclusions:

  • The developed model provides a robust framework for predicting contaminant microbe and particle behavior in streams.
  • Accounting for flow states and hyporheic exchange is crucial for accurate water quality modeling.
  • This research offers valuable insights for managing microbial contamination in riverine ecosystems.