geog rev 2

Created by: mayafairywings
Created on: 10-05-14 19:37

What is a destructive wave?

Destroy beaches. The waves are usually very high and very frequent. The back wash has less time to soak into the sand. As waves continue to hit the beach there is more running water to transport the material out to sea.Most common in winter

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What is a constructive wave?

build beaches. Each wave is low. As the wave breaks it carries material up the beach in its swash. The beach material will then be deposited as the backwash soaks into the sand or slowly drains away. Most common in summer.

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What affects the size of waves?

Wind speed Wind duration Fetch - distance of wind travel over open water Depth of water / roughness of sea bed Direction and speed of tide

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What is a spit?

A long ridge of sand and shingle attached to the land, but which ends up in the open sea.

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What is a bar?

Deposit of sand formed in a river channel, or a long sandy ridge running parallel to a coastline. coastal bars extend across estuaries to form bay bars

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What is a tombolo?

When a spit, or ridge or shingle, connects the mainland to an island

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How do sea walls help to manage / protect coastlines?

It protects the base of cliffs, land and buildings against erosion. can prevent coastal flooding in some areas

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How do groynes help to manage / protect coastlines?

Stops the movement of beach material along the coast by longshore drift. Allows the build up of a beach.

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How does rock armour help to manage / protect coastlines?

Absorb the energy of waves. Allows the build up of a beach.

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Other cards in this set

Card 2

Front

What is a constructive wave?

Back

Card 3

Front

What affects the size of waves?

Back

Card 4

Front

What is a spit?

Back

Card 5

Front

What is a bar?

Back

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geog rev 2