Oxbow Lakes

Question 1

How is an oxbow lake formed?

Answer 1

• when the neck of the lander gets narrower. The river then cuts though the neck and shortens its course leaving behind the old river which is cut off by deposition. The result is a crescent shaped lake. Overtime it will be a marsh or dry up.

Question 2

What are flooplains

Answer 2

• large area of flat land on either side of a river that is prone to flooding.
  -found in the middle and lower course and is made of alluvium when the river has a high discharge

Question 3

How are flood plains formed

Answer 3

Floopains are formed when meanders migrate across the floodplain due to lateral erosion and erode the bluff.
When the river floods it deposit its alluvium creating a flat floodplain and layers build over heard to form a thick deposit of fertile land

Question 4

What are levees

Answer 4

Leaves are raised embankments at the side of the river channels and occurs when the river is prone to flooding

Question 5

How are levees formed?

Answer 5

When a river bursts its banks, friction with the land reduced the energy and causes deposition. Heavy sediment is deposited close to the river and progressively become smaller further away from the river channel
After every flood, the banks are built higher which leaves raised banks on the side of the river
This means the channel can carry more water and flooding is less likely.