Fine Sediment Deposition and Filtration Under Losing and Gaining Flow Conditions: A Particle Tracking Model Approach

Antonio Preziosi-Ribero*, Aaron I. Packman, Jorge A. Escobar-Vargas, Colin B. Phillips, Leonardo David Donado, Shai Arnon

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Fine particle deposition within riverbeds plays a major role in riverine ecology and biogeochemistry by altering hyporheic exchange flux. Moreover, it is ubiquitous within streams and rivers across all flow stages. However, the dynamics of fine particle deposition are still not completely understood in rivers, and continuum models like the advection dispersion equation require modifications to represent the processes accurately. To enhance understanding of fine particle dynamics, we developed a novel numerical particle tracking model that simulates fine particle deposition as a stochastic process under losing, neutral, and gaining streamflow conditions. These flow conditions generate three different velocity profiles by combining the free surface and groundwater flows. In addition, a novel aspect of our model is the storage of filtered particles to estimate concentration fields within the bed. Our simulated results are qualitatively compared with previous laboratory flume experimental results of kaolinite deposition under similar conditions. The model indicates that fine particle deposition patterns and residence time functions depend heavily on the exchange flux between stream and groundwater, as well as bed filtration properties as the deposition of particles occurs at greater depths in the losing stream condition than in the neutral and gaining cases. Therefore, the spatial pattern of particle deposition is a direct result of pore water velocity profiles, while the concentration depends on filtration dynamics within the bed.

Original languageEnglish (US)
Article numbere2019WR026057
JournalWater Resources Research
Volume56
Issue number2
DOIs
StatePublished - Feb 1 2020

Keywords

  • groundwater surface water interaction
  • hyporheic exchange
  • particle tracking
  • sediment deposition

ASJC Scopus subject areas

  • Water Science and Technology

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