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Drainage basins

Rivers begin in upland areas and flow downhill, becoming
deeper and wider until they reach the sea. A drainage
basin is part of the water cycle where water is transferred
in a continuous cycle between the sea, atmosphere and the
land. As the river flows downstream its characteristics…

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Attrition: The rocks and pebbles that are transported by a river knock together and become smaller,
more rounded and smoother the further down a river you go

Solution or corrosion: The water can dissolve rocks such as limestone and this is transported as a
solution

River Process: Transport

Solution: vminerals…

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Landforms from erosion:

Waterfalls and Gorges




Landforms from erosion and deposition:

Meanders and Ox-bow lakes

These are formed by meanders. Meanders get larger over time with more erosion and deposition
occurring creating an Ox Bow Lake.

Erosion causes the outside bends to get closer until there's only a small bit…

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Cross section of a meander




Floodplains

This is the wide valley floor on either side of a river which occasionally gets flooded.
When a river floods onto the flood plain, the water slows down and deposits the eroded
material that it's transporting. This builds up the flood plain (makes it…

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they are deposited.

Factors affecting river discharge:

Amount of rainfall ­ Lots of rain and short heavy periods of rainfall means there's more runoff. Lag
time is decreased, so discharge increases

Temperature ­ on a hot day with dry conditions, or cold freezing days, the ground is very hard. This…

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Case Study:

MEDC ­ Boscastle, Cornwall, 2004

Causes

Over 60 mm of rainfall (typically a month's rainfall) fell in two hours.

The ground was already saturated due to the previous two weeks of above average rainfall.

The drainage basin has many steep slopes, and has areas of impermeable slate causing…

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· Insurance often doesn't cover the damages caused by the flood

· Many peoples jobs were based in tourism, which was reduced after the flood

· Mental health from the stress of the flood.

Case Study:

LEDC ­ Bangladesh, 2004

effects

Floods covoured more than half of bangladash
760 killed…

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The River Tees (landforms and flood control)

Where is the river Tees?

The River Tees is located in north-east England. Its source area is high in the Pennines in the west and
the river flows eastwards into the North Sea.

Main features of the upper course

The source of the…

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· Gabion (baskets filled with stones) to protect the walls and embankments from erosion.

· Fishing platforms, street lighting and replanting to improve the environment

· Building materials approved by English Heritage to be in keeping with the existing
architecture.

5) Improved flood warning systems-now have better liaison with the…

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Power generation: 26 turbines on left and right sides of dam. Six underground turbines planned for
2010

Why built:

Dam generate electricity for central and Eastern China - including Shanghi population 13million

Improve Navigation along the river

Reduce flood risk for 15million people

Sizes:

Dam - 2.3km long and 100m…

Comments

Anonymous

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Thanks for sharing this :D

liverpool7867

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thanks

NK778

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All of your revision notes are the BEST!!!!!!

I love the way that you added detailed info and pictures

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