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sea defenses at swanage
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Cliff drainage
Soft management
Soft engineering options are often less expensive than hard engineering options. They are usually more long-term and sustainable, with less impact on the environment.
Hard Engineering
Steel barriers and drains put into a cliff to intercept the water movement through the cliff which causes mass movement.The 'bunny' at Barton-on-sea had an artificial stream draining excess water.
sea defenses at Swanage
Hard engineering options tend to be expensive, short-term options. They may also have a high impact on the landscape or environment and be unsustainable.Swanage has 1.8km of coastal defence works, mainly concrete or stone sea walls and timber groynes. The sea wall and groynes to the south of the bay were put in place in the late nineteenth century.
Rock Armour
Large boulders are piled up on the beach.To defend the coast, for instance In Barton-on-sea.
Groynes
A wooden barrier built at right angles to the beach.To prevent long shore drift and allow beaches to form/build.Eighteen timber groynes were put in place in 2005, constructed out of certified tropical hardwood and some material salvaged from the pre-existing groynes.
Advantages
Absorb the energy of waves.
Allows the build up of a beach.
Disadvantages
Can be expensive to obtain and transport the boulders.
Beach replenishment
Advantages
Prevents the movement of beach material along the coast by longshore drift.
Allows the build up of a beach. Beaches are a natural defence against
erosion and an attraction for tourists.
Disadvantages
Can be seen as unattractive.
Costly to build and maintain.
This replaces beach or cliff material that has been removed by erosion or longshore drift.In November, 90,000 m3 of sand was deposited on the beach. The works were finally completed in June 2006 at an estimated cost of £2.2 million. The beach needs to be replenished with around 40,000m3 of sand every 20 years.
Advantages
Natural Defence against erosion and coastal floodings. It also attracts tourists. Relatively inexpensive.
Disadvantages
Requires constant maintenance as it is washed away.
"Negative ghost rider" - Top Gun