Rivers, floods and management

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  • Created by: tul
  • Created on: 18-11-15 10:19
Flood
A temporary excess of water which spills over onto land.
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Deposition
The laying down of solid material, in the form of sediment,on the bed of a river or one the sea floor
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Erosion
The break up of rocks by the action of rock particles being moved over the Earth's surface by water,wind and ice.
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Transportation
The movement of particles from the place they were eroded to the place where they are deposited.
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Incised meander
This is caused by rejuvenation. It is a a meander that has cut deeply into the floodplain, creating steep cliff-like banks.
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Knick point
Usually marked by rapids, this represents rejuvenation and is a sudden break in the long profile of the river.
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River terrace
A narrow, flat piece of ground that runs parallel to the river either side, above the level of the floodplain. They are usually created following a fall in base level.
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Hazard
A natural event that threatens life and property. A disaster is the realisation of the hazard. Flooding is an example of a natural disaster.
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Deposition
The laying down of solid material, in the form of sediment, on the bed of a river or on the sea floor.
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Erosion
The break up of rocks by the action of rock particles being moved over the Earth's surface by water, wind and ice.
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Transportation
The movement of particles from the place they were eroded to the place where they were deposited.
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Attrition
This is the reduction in the size of fragments and particles within a river due to the processes of Abrasion, Hydraulic action and Corrosion. The fragments strike one another as well as the river bed. They become smoother and smaller and more rounded
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Where in a river does Lateral erosion occur?
Occurs more frequently in the middle and lower stretches of the river, where the valley floor lies closer to sea level.
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Where is the strongest current found for Lateral erosion?
The strongest current is found on the outside of the bend and hydraulic action causes the bank to be undermined and to collapse.
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What is the capacity of the river?
This is a measure of the amount of material it can carry, that is, the total volume of the load.
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What is the competence of a river?
This is the diameter of the largest particle that it can carry for a given velocity.
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Baseflow
Water that reaches the channel largely through slow throughflow and from permeable rock below the water table
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Stormflow
Water that reaches the channel largely through runoff. This may be a combination of overland flow and rapid throughflow.
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Rejuvenation
An increase in the energy of a river caused by either a fall in its base level or an uplift of the land.
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Card 2

Front

Deposition

Back

The laying down of solid material, in the form of sediment,on the bed of a river or one the sea floor

Card 3

Front

Erosion

Back

Preview of the front of card 3

Card 4

Front

Transportation

Back

Preview of the front of card 4

Card 5

Front

Incised meander

Back

Preview of the front of card 5
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