River Landforms

formation of river landforms such as braiding,  flood plains, levees and deltas (all caused by fluvial deposition)

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  • Created by: Will
  • Created on: 16-05-11 09:30


1) braiding occurs when a river is carrying a vast amount of eroded sediment

2) if the rivers veolocity drops or the load becomes to much for the river to carry then the sediment is deposited in the river channel

3) this causes the river to divide into small, winding channels that eventually rejoin to form a single channel

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Flood Plains

1) when a river overflows it floods flat land either side of the river

2) this increases the wetted perimeter (the total length of the banks and river bed that is in contact with the water) and reduces the hydraulic radius

3) this then means that friction is increased and therefroe reduced velocity causing sediment to be deposited

4) the sediment that is deposited is called alluvium and is very fertile

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1) they are naturally raised embankments created when the river overflows

2) during a flood sediment is deposited across a flood plain as friction is increased and the river loses velocity

3) the heaviest material (e.g. sand and gravel) is dropped first closest to the river channel

4) over time and many floods the material dropped near the banks of the river build up to form levees

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1) when water reaches a water store e.g. sea or lake the energy of the river is absorbed by the slower moving water of the store (sea or lake)

2) this causes the river to slow down and lose energy meaning that the river then deposits its load

3) the deposit builds up on the river bed until it reaches above sea level

4) this deposited material then partial blocks the mouth of the river

5) this then spilts the river into several distributaries to be able to reach the sea, forming a delta

There are four types of delta:

Bird's Foot - narrow lines of sediment form where there are few currents to disturb the sediments

Cuspate - arrow shaped as the tides are stonger enough to remove some of the outer deposits

Arcuate - there are weak current meaning delta can protude further into the sea however weak currents round off delta

Estuarine - where the river enters the sea (or lake) at a bay, sediment fills the bay up to the headlands

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