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Lutocline Formation by Waves: Source of Sediments and Sediment Transport

Explore lutocline generation by waves, tidal currents, and sediment resuspension processes. Discuss primary lutocline significance, turbulent kinetic energy balance, and field data limitations.

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Lutocline Formation by Waves: Source of Sediments and Sediment Transport

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  1. Lutocline formation by waves Susana B. Vinzon Universidade Federal do Rio de Janeiro

  2. Lutoclines :Steps in suspended sediment concentration Lutocline generation: source of sediments? Ressuspension from the bottom by tidal currents and/or waves Deposition from suspension flood-ebb slack

  3. Secondary Primary 320 g/l Tidal currents: Amazon Shelf data AMASSEDS project

  4. Salt stratification effect:

  5. Hindered settling effect: Hindered Settling Flocculation

  6. Lutocline simulations s:uniform Ws: uniform

  7. Lutocline generation by waves Steady state turbulent kinetic energy balance Shear production Buoyancy Dissipation Wave-mean turbulence intensity (Sleath,1991)

  8. Lutocline height:

  9. Laboratory results: ws = 0.05 mm/s kr = 2 cm

  10. Field data (Traykovski et al 2000):

  11. Discussion • Closer look at the wave turbulence model (for field conditions) • Limitation of the lab experiments (Re) • The model considers no erosion threshold

  12. Importance of Primary Lutocline for sediment transport:

  13. depth Time depth

  14. First Hypothesis Second Hypothesis Mud layer High measured velocities near bottom because the profiler don’t find the true bottom No mud layer High measured velocities near bottom due to log profile

  15. How to know which one is correct?Do we need new field techniques for measuring SSC and velocities below the primary lutoclines?

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