Coasts 4 – Transportation & Deposition

Coasts 4 - Transportation Just like rivers, 4 main types of

transportation along coasts:

• Solution

• Suspension

• Saltation

• Traction

Dissolved – dissolved material

Bouncing – small stones

Carried along – silt sized particles

Rolling – large stones

How is material carried along the shore? By Longshore Drift…

• http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_14_flash.shtml

•To do:- draw diagram using p302 and fill in gaps exercise

Deposition

Deposition occurs when:

• Waves have low energy

• The wind is mild

• Conditions are calm

• The sea bed is flat & shallow

• There is a lot of friction

• The coastline changes direction

What are the distinctive landforms resulting from erosion?

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Headlands and bays

http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_05_flash.shtml

Headlands and bays - fill in the gapsHeadlands and bays form along coasts that have alternating _______ (harder) and less resistant (softer) rock. Where there is harder rock the coast will be eroded more _______ leaving a _________ which sticks out into the sea. Where there is softer rock erosion will be _______ and a _____ will form. This kind of coast is known as DISCORDANT - the rocks are at right angles to the coast. Now label the more resistant headlands and the less resistant bays on each mini picture.

Wave-cut platforms and cliffs

http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_07_flash.shtml

Annotate the diagram - 18.4

• Working in pairs, match up terms and definitions by matching up letters and numbers. I will come round to check answers, then stick the sheet onto you work. You have 5 minutes!

To do:-

Caves, Arches, Stacks & Stumpshttp://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_11_flash.shtml

To do:-•Worksheet 2.1 – use p301 to help you•Fill in gaps exercise and labelling of

photos of erosional features. •Also, write down key fact: Caves,

arches, stacks and stumps are made when a narrow headland made from hard rock is eroded.

Plenary: Blockbuster

Depositional features

Depositional Features - Beach

How a spit is formed…

http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21605

Spits are created through the process of deposition. A spit is an extended stretch of beach material that projects out to sea and is joined to the mainland at one end.

Spits are commonly found where there is a prevailing wind and where there is longshore drift. An example of a spit is Spurn Head, found along the Holderness Coast in Humberside.

How a spit is formed…

Spit development• If a spit doesn’t curve or stop

growing, 2 landforms may result:

1. SAND BARThese develop when a spit grows across to join another part of the coastline. They are rarer than spits. If there is a river feeding into the sea or if the wind changes direction they will not form. E.g. Slapton Ley, Devon.

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Spit development continued…

2. TOMBOLO

If a spit grows out to attach an island to the mainland it will form a tombolo. E.g. Chesil Beach, Dorset.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.QuickTime™ and a

TIFF (Uncompressed) decompressorare needed to see this picture.

Homework:-

• Explain, with the aid of a diagram/s, how spits are formed and give a named UK example and its location.

• Use p303 of textbook to help you. • Animation web address:

http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21605