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Sediment Gravity Flows

Sediment Gravity Flows. Sediment Gravity Flow Types. Slides and Slumps-mass movement Debris flows-matrix supported flows Grain flows-grain interaction Fluidized flows-fluid escape Turbidity currents-density currents with high sediment concentrations.

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Sediment Gravity Flows

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  1. Sediment Gravity Flows

  2. Sediment Gravity Flow Types Slides and Slumps-mass movement Debris flows-matrix supported flows Grain flows-grain interaction Fluidized flows-fluid escape Turbidity currents-density currents with high sediment concentrations

  3. Large Slumps can trigger tsunamies andcause significant damage to offshore infrastructure Slump Scar Slump GeoMap.App

  4. For slumping to occur at a given slope, the shear strength of the sediment must be overcome by shear stress • S(Shear strength) = c + o tan ø, where: c = cohesion o = effective pressure (N-n) N = normal load n = pore water pressure ø = angle of internal friction • Triggered by slope increase and/or a change in normal load (deposition), gradual increase in pore water pressure, or a catastrophic event such as an earthquake that triggers movement

  5. Slumps maintain some amount of stratigraphic integrity (bedding) during transport and deposition

  6. Seismic expression of slumps slump slump

  7. (chaotic seismic facies) slump

  8. Slumps in outcrop

  9. Debris Flows-fine grain matrix is supporting medium

  10. Mechanics of Debris Flow Transport(matrix supported flows)

  11. Debris flow offshore Texas ridges

  12. Debris Flow Fans

  13. Massive Seismic Character

  14. Debrites

  15. Sediment Gravity FlowTransitions

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