Mechanics of Fluid Flow and Sediment Transport

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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
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SlumpsS(shear Strength)co
tan 0ccohesionoeffective pressure
(N-n)NNormal loadnpore water pressure0angle
of internal frictionFor flow to occur, the
shear strength of the sediment must be exceeded
by the internal shear stress. This happens when
sediment overburden is increased or when pore
water pressure becomes excessive. Slumps can
also be generated by seismic activity,
pseunamies, or isostatic movement
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Debris Flows
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Slumps and slump scars of the Louisiana slope
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Slump Scars on upper slope
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Debris Flows(chaotic seismic facies)
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Mechanics of Debris Flow Transport
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Debrites
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Sediment Gravity FlowTransitions