River Severn

Primary Homework Help
The River Severn

A Key Stage 2 Resource for Rivers and Coasts

 
 
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The River Severn at Worcester

Material which has been eroded from river banks is transported down the river. The material may include pebbles, stones, boulders, tree branches and leaves.

image: railway bridge
Berty Beaver spots branches behind the pillar
How do you think they got there?

Materials such trees and branches are carried on the surface of the water. If there is a boulder or other large object in the way, then they can get stuck or be deposited behind this object. This could be what has happened in these photos.

image: pillar
The branches and twigs have got caught

image: close up of twigs
Some rubbish has also been washed downstream and got stuck

Berty notices the white object in the right move.

image: swan
A swan has made its nest among the twigs

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Key Vocabulary

Transportation
The movement of pebbles, sand, sticks and mud (the 'load') down a river.

There are several types of transportation:

Flotation. Materials such trees and branches are carried on the surface of the water. If there is a boulder or other large object in the way, then they can get stuck or be deposited behind this object.

Suspension. Very small particles are carried in the water. They are usually deposited in the lower course where the flow of water becomes very slow.

Solution. Very small particles of sediment dissolve in the water. Rivers which carry a lot of sediment in suspension may have brown water.

Saltation. Small pebbles and rocks bounce along the river bed. In turn, they can loosen other small sediments.

Traction. Small pebbles roll along the river bed.

 

 
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