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Modelling sheet-flow sediment transport in wave-bottom boundary layers using discrete-element modelling.

Joseph Calantoni1, K Todd Holland, Thomas G Drake

  • 1Naval Research Laboratory, Marine Geosciences Division, Code 7440.3, Building 1005, Stennis Space Center, MS 39529, USA. joec@nrlssc.navy.mil

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 13, 2004
PubMed
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Summertime conditions of a muddy estuarine environment: the EsCoSed project contribution.

Water science and technology : a journal of the International Association on Water Pollution Researchยท2015
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Particle shape significantly impacts sediment transport in coastal areas. Simulating non-spherical grains improves predictions of bed-load flux, crucial for understanding coastal geomorphological change.

Area of Science:

  • Coastal geomorphology
  • Fluid dynamics
  • Granular physics

Background:

  • Sediment transport in oscillatory boundary layers is key to coastal change.
  • Current models often simplify particle interactions, limiting accuracy.
  • Direct simulation of granular physics offers a more detailed approach.

Purpose of the Study:

  • To investigate the role of particle shape in sediment transport.
  • To develop and validate a numerical model for simulating granular physics in wave-bottom boundary layers.
  • To compare simulation results with laboratory measurements.

Main Methods:

  • Developed a discrete-element model coupling 3D particles with a 1D fluid phase.
  • Modeled non-spherical sediment grains using overlapping spheres.

Related Experiment Videos

  • Simulated oscillatory sheet flow with composite particles and compared to spherical particle simulations.

    • Main Results:

    • Particle shape influences the critical angle of repose, increasing with non-sphericity.
    • Simulations with realistic composite particles showed better agreement with lab data than spherical particle models.
    • Bed-load flux predictions are sensitive to particle shape, especially on steeper slopes.

    Conclusions:

    • Particle shape is a critical factor in accurately modeling sediment transport.
    • Discrete-element modeling of non-spherical grains enhances understanding of coastal processes.
    • Findings suggest improved bed-load flux calculations for coastal engineering and geomorphology.