Sediment transport over ripples in oscillatory flow

  • Zedler E
  • Street R
  • Asce M
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Abstract

In this paper, we present results of a large-eddy simulation of flow
and suspended sediment transport around prototypical ripples based
on "long-wave ripples" as measured at Duck, N.C., in waves of height
I in and period of 10 s. Solving the volume-filtered Navier-Stokes
equations for the momentum and an advection-diffusion equation with
a setting term for the suspended sediment, we obtain time-dependent,
three-dimensional descriptions of the velocity, pressure, and sediment
concentration fields. Although the main flow and sediment transport
patterns are governed by a quasi-two-dimensional vortex formation-ejection
mechanism, we illustrate the three-dimensional structure of both,
and make qualitative comparisons with the results of other researchers.
We conclude with analysis of concentration time series measured at
a point and interpret them within the larger framework of the flow.
The present simulations demonstrate that the flow over these larger-scale
ripples resembles that over vortex ripples quite strongly.

Author-supplied keywords

  • large-eddy simulation
  • ripples
  • suspended sediment

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Authors

  • Emily A Zedler

  • Robert L Street

  • M Asce

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