Swanage Bay case study Causes of coastal recession

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 L 2 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 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. + 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. + 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. + 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. + 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. + 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 stop the beach being washed away. (look at the beach height either side of the groyne!) + -

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)