Coastal Defence.

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Presentation transcript:

Coastal Defence

Teacher’s notes and Flash files Most slides contain notes to accompany the presentation. This icon indicates that the notes contain particularly detailed instructions or extension activities. To access these notes go to ‘Notes Page View’ (PowerPoint 97) or ‘Normal View’ (PowerPoint 2000/2002). Notes Page View Normal View This icon indicates that a Flash file has been embedded into the PowerPoint slide. These files are not editable.

Swanage

Coastal erosion in Swanage the soft, clay bedrock is prone to attack from the waves river drains through Swanage and encourages slumping

Coastal defence in Swanage Swanage Bay GROYNES PIER CONCRETE REVETMENT HEADLAND IS FENCED TO STOP TRAMPLING

Swanage Bay Study the photo and map extract. Is this Peveril or Ballard Point? pier

How do groynes work? Groynes trap the sand which is carried along the coast by longshore drift. The sand acts as a natural protection against the force of the waves. The waves break on the beach and not the cliffs.

Decision making exercise 10m Engleton Why is Seaview being eroded? Seaview Should Seaview be protected from coastal erosion? If so, how? groynes buildings Roman Palace Prevailing wind till This is the imaginary coastal town of ‘Seaview’. Seaview has been suffering from coastal erosion for the last 15 years since the nearby larger town of ‘Engleton’ had groynes built to protect its own coastline. Seaview is built on ‘till’ (soft clay) and is losing up to 30cm of land per year. Why protect Seaview? The town is home to 20,000 residents. The remains of a Roman Palace are located here. This attracts tourists.

The options... Rip rap Sea wall Groynes Gabions Stone revetment DO NOTHING!

Further information on the schemes the waves break on the rip rap and not on the coastline rip rap is simply boulders/stones wire box with rip rap Stone revetment acts as a barrier to the waves. Revetments can also support sea walls.

Problems with sea walls Why might a sea wall cause more coastal erosion?

What are the advantages and disadvantages of each option? SCHEME COST APPEARANCE EFFECTIVENESS Do Nothing !

Weighting table Now you have thought about the advantages and disadvantages, give each scheme a score from 1 (poor) to 5 (good), using the same criteria. For example, an expensive scheme should have a low score. Add up the total for each scheme. Would you choose the scheme with the highest score? Why? Which is the most important criteria? Cost? Appearance? Effectiveness? SCHEME COST APPEARANCE EFFECTIVENESS Do Nothing!