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Slide 1

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The Hjulstrom Curve…read more

Slide 2

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What is it?
The Hjulstrom curve is an attempt to relate
the work done by a river to its velocity. It
does not take into account any effects of
turbulence within the river flow.…read more

Slide 3

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The General Pattern
As river discharge rises,
the velocity of the river
increases this generally
allows the river to pick
up bigger particles from
the river bed and river
As discharge
decreases, so does the
velocity and generally
particles are deposited
due to their size,
largest to smallest.…read more

Slide 4

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Key Words
Entrain- to pick up/ pull along
Critical Erosion Velocity- the velocity required to
entrain a particle.
Settling Velocity- the velocity at which a particle
will be deposited.
Flocculation-fresh water meets salt water, causes
chemical settling of clays and silts creating
Coagulation-the process of the silts/clays
clustering in the water.…read more

Slide 5

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Relationship 1.
Sand is entrained at lower velocities even
though it is a bigger particle than silt and
clays. It's very nature is one of individual
particles rather than the smooth and
grouped nature of silt and clays that are
found on the river bed.…read more

Slide 6

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Relationship 2.
Once a particle has been entrained by the
water, the velocity required to move that
particle is less than the velocity required to
entrain it. The larger the particle, the
smaller the difference between the critical
erosion velocity and the settling
velocity. Some larger particles will be
deposited after they have been entrained.…read more

Slide 7

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Slide 8

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