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Lecture

3032 Week3


Department
Geology
Course Code
GEOL 3032
Professor
All

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Objective:
describe how and when particles get entrained by flows in water
(sediment transport), or are deposited (non cohesive)
Why is this important?
We want to be able to understand what types of flows carry what
types of sediment to:
1) Predict sediment transport
2) And to determine what flows might have transported grains we
find in ancient sediment deposits.
You need to learn:
Reynolds number meaning and equation
Froude number meaning and equation
Stokes Law meaning and equation
Quadratic stress law for shear stress and shear velocity

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What do we need to know?
Fluid:
density
viscosity
velocity distribution
From this, calculate BED shear stress
Particles:
Diameter
Shape
Density
From this, calculate CRITICAL shear
stress
Is BED shear stress greater than
CRITICAL shear stress?
Other factors:
gravity
bed configuration
Is the sediment cohesive?

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Properties of the flow
f fluid density, M L-3 (Greek letter
rho)
μ molecular viscosity (also called
dynamic viscosity, because it is
only apparent in a moving
fluid), force per unit area per
velocity gradient, ML-1 T-1, Ns
m-2 (Greek letter mu)
~0.001 Ns/m2 at 20°C, or 0.01
Poises (cgs)
v kinematic viscosity (/f)
(Greek letter nu)
Vertical axis=
μ x 1000 Ns/m2
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