Coasts - Coastal Defences Flashcards
Know about threats to the coast and the defences employed to protect it.
Name a location in the U.K. where coastal erosion is a concern.
Holderness Coastline
Check page 53 of your text book.
Name a major threat from coastal erosion.
Loss of coastal settlements.
What form of sea defence has been employed to protect the cliffs along the Holderness coastline to help prevent cliffs from being undercut?
concrete armour / sea wall
How do larger beaches help protect cliffs?
Beaches absorb wave energy. Larger beaches absorb more energy so there is less energy to erode the cliff.
What do people use to help build up beaches?
groynes
How are some sea walls adapted?
They are curved
How does the curve of a sea wall help its effectiveness?
When the wave hits the wall it is deflected and its energy sent back out to sea. Cool huh.
What can be paced at the base of cliffs to help protect them from erosion?
rocks and boulders or gabions
What are gabions?
large steel cages filled with rocks and boulders
What benefit do gabions have over just rocks and boulders?
The steel cage prevents the energy of the waves carrying the rocks away.
Apart from helping to create larger beaches, how else to groynes protect the coast?
They prevent beach erosion from longshore drift.
Name a place on the coast in the U.K. that has a lot of deposition?
Rye - this used to be a port on the south-east coast, but it is now several miles inland.
I know a great fish restaurant there.
