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A Lattice-Boltzmann model for simulating bedform-induced hyporheic exchange
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  • Davide Dapelo,
  • Stefan Krause,
  • Jesus D Gomez‐Velez,
  • John Bridgeman
Davide Dapelo
University of Liverpool

Corresponding Author:[email protected]

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Stefan Krause
University of Birmingham
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Jesus D Gomez‐Velez
Oak Ridge National Laboratory
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John Bridgeman
University of Birmingham
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The Lattice-Boltzmann (LB) method is applied here for the first time to simulate bedform-induced hyporheic exchange flow in a reduced complexity model. The flexibility of the LB allows surface and hyporheic flows to be resolved together, in contrast to other approaches for similar model domains, in which surface flow is usually solved independently, and then the solution of the surface flow provides the boundary conditions to model the hyporheic exchange flow. At the same time, the superior computational efficiency of LB allows the use of Large Eddy Simulations within transient simulations. Numerical results show a faithful reproduction of pressure along the bedform surface—especially, the pressure drop leeward to the dune. Results also show short-time-dependent phenomena which were previously described only in the context of DNS studies over reduced-size computational domains. Short-time-dependent phenomena include pressure oscillations and time-dependence of hyporheic zone morphology, with the latter eventually extending beyond the limits of a single bedform element.
04 Oct 2023Submitted to ESS Open Archive
05 Oct 2023Published in ESS Open Archive