Existing models for estimating hyporheic oxygen mass transfer often
require numerous parameters related to flow, bed, and channel
characteristics, which are frequently unavailable. We performed a
meta-analysis on existing dataset, 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 oxygen transfer
coefficient, particularly in scenarios where detailed bed
characteristics such as permeability might not be readily available.