coastal defences
- Created by: harryc1
- Created on: 16-09-16 11:44
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- Types of Hard and Soft engineering used on the coastline of the UK
- Revetments-slated wooden structures built at the base of a cliff
- Positives
- Effective for many years
- Absorb wave energy through the slats
- Can be cheap compared to other techniques
- Negatives
- Not effective in storm ciondition
- Regular maintenance is required
- Can make the beach inaccessible for tourists
- Positives
- Rip Rap-Large rocks placed in front of the cliff
- Positive
- Can be very cheap
- Dissipates wave energy
- Effective for many years
- Negative
- unattractive
- Not effective in storm conditions
- Can make the beach inaccesable for tourists
- Positive
- Re-curved seawalls- walls usually made of concrete; modern ones have a re-curved face
- Positive
- Reflect and absorb wave energy
- Very visible- make residents feel safe
- Effective for many years
- Negative
- Expensive to build
- Ugly- puts tourists off
- Can cause wave scouring if not positioned correctly
- Positive
- Groynes- usually made of wood; stretch from the coastline into the sea
- Positive
- Effective for many years
- Keep beach in place for tourist industry
- Prevents longshore drift- sand builds up on one side of the groyne
- Negative
- Disrupt the natural processes working on the beach such as longshore drift
- Unatractive-ndifficult to walk along the beach
- Positive
- Gabions- wire cages filled with stone used to reduce erosion
- Possitives
- Cheaper than other coastal defence
- Rock cages absorb wave energy
- Negatives
- Wire cages can break-need to be ties down securely
- Not as efficient as other form of coastal defence
- Possitives
- Offshore reefs- large concrete blocks and natural boulders are sunk offshore to altar wave direction and to dissipate wasve energy and tides.
- Positives
- Allows the build up of sand due to the reduction of wave energy
- Waves break further oiffshore and therefore reduce their erosive power
- Negatives
- May be removed by heavy storms
- Difficult to install
- Positives
- Revetments-slated wooden structures built at the base of a cliff
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