Transportation презентация

without being seen.

Large boulders and rocks are ‘rolled’ along the bed of the river.

Smaller pebbles and stones are ‘bounced’ along the bed of the river.

Smaller particles of silt and sand are held within the water and transported along in the flow of water.

Transportation

the bed and banks of the river.
Material is rubbing against the bed and banks of the river wearing them away.
Some rock such as calcium carbonate dissolve in the water if it is slightly acidic.
The load itself being carried, bang into each other and break up and become smaller and smaller.

of water, wind or ice

The movement of sediment along the river’s course


The putting down of material by the river

an oxbow lake. All of you will be able to describe the processes that form a meander Most of you will be able to describe how a meander becomes an oxbow lake Some of you will be able to explain why meanders and oxbow lakes form.

Meanders & Ox Bow Lakes

to the formation of meanders.

A*-B Must be able to explain the process that leads to the formation of river meanders.

valley

waterfall

deposition

transportation

place in the middle stages of a river.
We are going to look at a Meanders.

travel at the same speed. The fastest and most powerful water travels around the outside of the bend.

Think about being in the back or a car when going round the corner…

Or being on a rollercoaster and being thrown to one side of the carriage.

flows over flatter land. Lateral (sideways) erosion happens because of fast moving water on the outside of meanders.
Meanders constantly change their shape and position.

1/3 of a page high and as wide as your page. Make sure it has bends it in like this one:

Using a different colour mark on your river the route of the fastest water.

the areas of the river the water is travelling slower, the water has less energy and so deposits the eroded material.

place

Lateral Erosion

Deposition

= Lateral Erosion

= Deposition

Video

current fastest current

form on? Flat or steep?
Which side of a meander erodes the banks? Why?

floods it breaks through the thin meander neck and the river takes the easier, straight course.
This cuts off the meander loop leaving an oxbow lake. Over time, the oxbow lake gets filled in and overgrown.

4. Explain the formation of an oxbow lake