Coastal defences and their benefits/costs
- Created by: Katherine_
- Created on: 05-11-20 20:47
Other questions in this quiz
2. What are the costs of gabions?
- They starve beaches further down the coast of sand, making them narrower. Narrow beached don't protect the coast from erosion very well.
- They create strong backwash which erodes under the wall. Expensive to build and maintain.
- Ugly to look at. The cages can corrode over time.
- Boulders can be moved by strong waves so the need to be replaced.
3. What are the costs of groynes?
- Boulders can be moved by strong waves so the need to be replaced.
- They starve beaches further down the coast of sand, making them narrower. Narrow beached don't protect the coast from erosion very well.
- Ugly to look at. The cages can corrode over time.
- They create strong backwash which erodes under the wall. Expensive to build and maintain.
4. What is dune regeneration?
- Creating or restoring sand dunes by nourishment, or planting vegetation to stabilise the sand.
- Sand and shingle from elsewhere (e.g from the seabed or from lower down the beach), is added to the upper parts of the beach.
5. What is a sea wall?
- A wall made out of hard materials such as concrete that reflects waves back to the sea.
- A wall of wire cages filled with rocks, usually built at the foot of the cliff.
- Boulders that are piled up along the coast.
- Wooden or stone fences that are built at right angles to the coast. They trap material transported by longshore drift.
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