Transcript Swanage Bay case study Use the work sheets and video to add

Swanage Bay case study: Causes of
coastal recession
Odd one out and why:
1. spit, beach, bar
2. Attrition, abrasion, biological
3. Fetch, longshore drift, geology
4. Backwash, erosion, beach
5. Headland, bay, stack
6. Chalk, clay, limestone
http://www.bbc.co.uk/learningzone/clips/oldharry-rocks-dorset/3244.html
• Coastal recession…..
Geology
Fetch
humans
Explain the factors which
affect the rate of coastal
recession (4)
HINT: YOU MUST GO BEYOND JUST
SAYING ‘FETCH’
Swanage bay case study L2
Create a Venn
diagram like this and
complete the effects
of coastal recession.
Social
Which ones overlap?
Use FACTS!
Economic
Environmental
Coastal management at Swanage
1. What is hard and soft engineering?
2. Stick in the sheet with the information on
add a positive and a negative
3. Use page 67 and 68 to add in the hard and
soft engineering for Swanage
4. Annotate on your photo on the back where
the different techniques are.
5. Complete the 6 mark question,
Beach Replenishment
Sometimes it is necessary to replace the sand and shingle that has been lost by the action of the
sea. Lorries are used to transport material dredged up from the sea bed to the beach.
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Rip Rap
These big boulders are usually placed at the bottom of a cliff. As the waves hit the boulders, their
energy is lost so their erosive power is reduced. They are expensive.
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Revetments
These are wooden posts with slats of concrete laid on top of the beach to stop the sand being
eroded.
They are cheaper than sea walls, but do not last long where the waves have lots of energy.
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Gabions
Metal cages filled with rocks. They are stacked together to make a wall to protect the coast.
They are much cheaper than other sea defenses but don’t last as long.
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Curved Sea Wall
A wall with a rounded lip at the top. This breaks up the waves energy and reflects the waves back
into the sea, stopping them going over the top. Expensive but last for a long time.
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Groynes
Natural beaches are the best sea defence, but often they are washed away by longshore drift.
Groynes are cheap fences made from large wooden posts. They trap the sand and stop the beach
being washed away. (look at the beach height either side of the groyne!)
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Swanage Bay: 5 Key facts
Landform of erosion (name, location)
Landforms of deposition (name, location)
Factors affecting rate of recession in Swanage (pg 62 blue
book)
Effects of recession (pg 62 blue book)
Social
Economic
Environmental
Hard engineering management (blue bk 66-68)
Soft engineering management
Why have some parts of Swanage bay been managed and others left?
Annotate on here the different management techniques
Choose an area of coastline you have studied.
Explain how this area of coastline is being managed. (6)