CROSSTEX - Wave breaking, Boundary Layer Processes, the Resulting Sediment Transport and Beach Profile Evolution

Abstract

Two numerical models focused on different scales are revised and extended to model surf zone hydrodynamics and sand transport driven by random waves in order to test with data measured during CPOSSTEX and other field experiments. The two-phase model is successfully revised to be driven by measured time series of wave-current velocities and breaking wave turbulence during CROSSTEX experiment. When breaking wave turbulence is incorporated, the model is able to predict the strong suspension event observed during CROSSTEX. The new model will be used to study and evaluate the effect of breaking wave turbulence on sediment transport fluxes. A 2nd order implicit scheme is implemented into the 2D PANS wave model (COBRAS). The new model is more numerically stable and accurate. We find that with a more accurate scheme, the predicted breaking wave turbulence kinetic energy is generally 30 to 100% smaller than the original 1$%order explicit scheme. Hence, this new scheme will improve our future plan to use COBRAS to study surf zone sediment transport.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2006
Accession Number
ADA469419

Entities

People

  • John Trowbridge
  • Tian-jian Hsu

Organizations

  • Woods Hole Oceanographic Institution

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Breakwaters
  • Coastal Engineering
  • Energy
  • Engineering
  • Flow
  • Fluid Flow
  • Hydrodynamics
  • Kinetic Energy
  • Layers
  • Personal Information Managers
  • Sedimentation
  • Sediments
  • Transport Ships
  • Turbulence
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Computational Fluid Dynamics (CFD)
  • Computational Modeling and Simulation