shows the relationship between the velocity of a river and the size of particles that can be eroded, transported or deposited.
1 of 5
what is the general trend
Velocity increases as discharge rises and generally this enables a river to pick up larger particles from the bed or banks of the channel.
2 of 5
what are the 3 relationships it shows
Sand particles are moved by lower entrainment velocities than smaller silts, Once entrained particles can be carried at lower velocities than those required to pick them up.The smallest particles, clays and silts are only deposited at low velocitie.
3 of 5
list another relationship
as velocity and discharge reduce, then particles are generally deposited according to their size, larger first.
4 of 5
why are small clay and silt particles hard to entrain
because they tend to stick together. They lie on the river bed and offer less resistance to water flow than larger particles – so much more powerful flows of water are required to lift them into the water.
5 of 5
Other cards in this set
Card 2
Front
Velocity increases as discharge rises and generally this enables a river to pick up larger particles from the bed or banks of the channel.
Back
what is the general trend
Card 3
Front
Sand particles are moved by lower entrainment velocities than smaller silts, Once entrained particles can be carried at lower velocities than those required to pick them up.The smallest particles, clays and silts are only deposited at low velocitie.
Back
Card 4
Front
as velocity and discharge reduce, then particles are generally deposited according to their size, larger first.
Back
Card 5
Front
because they tend to stick together. They lie on the river bed and offer less resistance to water flow than larger particles – so much more powerful flows of water are required to lift them into the water.
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