A Unifying Model for Turbulent Hyporheic Mass Flux Under a Wide Range of Near-Bed Hydrodynamic Conditions

Chieh Ying Chen, Dimitrios K. Fytanidis, Marcelo H. Garcia

Research output: Contribution to journalArticlepeer-review

Abstract

Existing models for estimating hyporheic solute mass flux often require numerous parameters related to flow, bed, and channel characteristics, which are frequently unavailable. We performed a meta-analysis on existing data set, enhanced with high Reynolds number cases from a validated Computational Fluid Dynamics model, to identify key parameters influencing effective diffusivity at the sediment water interface. We applied multiple linear regression to generate empirical models for predicting eddy diffusivity. To simplify this, we developed two single-parameter models using either a roughness or permeability-based Reynolds number. These models were validated against existing models and literature data. The model using roughness Reynolds number is easy to use and can provide an estimate of the mass transfer coefficient for solutes like dissolved oxygen, particularly in scenarios where detailed bed characteristics such as permeability might not be readily available.

Original languageEnglish (US)
Article numbere2023GL105807
JournalGeophysical Research Letters
Volume51
Issue number6
DOIs
StatePublished - Mar 28 2024
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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