1. Sediment Gravity Flow Deposits

2. Sediment Gravity Flow Deposits
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. Slumps 1. Bedding remains intact 2. Requires slopes of at least 3°

5. For slumping to occur, the shear strength of the sediment must be overcome by gravity S(Shear strength) = c + o tan ø c = cohesion o = effective pressure (N-n) N = normal load n = pore water pressure ø = angle of internal friction

6. Debris Flows (matrix supported flow)

7. Debris Flows (Debrites) are matrix supported flows

8. Before a turbidity current will begin to flow, it must first overcome both bottom shear stress (t1) and the shear stress excerpted by the surrounding fluid (t2). Stated differently, for movement to occur, the gravitational forces caused by the density differences of the two fluids operating on the slope must exceed the combined bottom shear stress and surfaces shear stress. We can express this relationship using the following equation:
t1+t2= (Pt-P) gh sin B
where: Pt-P is the density difference between the two fluids
h= the thickness of the flow
g=acceleration due to gravity
sin B= bottom slope

9. Submarine Canyons and Gullies

10. Turbidites (Bouma Sequence

12. Grain Size of Turbidites is characterized by fining upward successions

13. Sediment gravity flow transition refers to the down-slope transition from slump to debris flow to turbidite as the flow looses shear strength through shearing an addition of water

14. Fan Models