Which sea Defence is present at Mappleton?

Steps taken to protect the village of Mappleton

A coastal management scheme costing £2 million was introduced involving two types of hard engineering – placing rock armour along the base of the cliff and building two rock groynes. Mappleton and the cliffs are no longer at great risk from erosion.

How is Mappleton protected from the sea?

Coastal Management at Mappleton

Blocks of granite were imported from Norway for the sea defences. The purpose of the two rock groynes was to trap beach material. By retaining a wide, sandy beach between the stone groynes, the sea would not reach the base of the cliffs at Mappleton.

How successful have the coastal defences at Mappleton been?

The coastal defences have been effective in reducing erosion between the two groynes. As the result of these coastal management strategies a substantial beach has been retained between the groynes halting erosion. However, further south the rate of erosion has increased significantly.

What type of sea Defences are there?

Coastal defences
  • 3.1 Groynes.
  • 3.2 Sea wall.
  • 3.3 Revetments.
  • 3.4 Breakwaters.
  • 3.5 Gabions.

Why might the coastal Defences at Mappleton have a negative effect further down the coast?

Owing to the limited beach material waves reach the base of the cliffs even during neap tides. This has led to increased rates of erosion and an increase in slumping. Rates of erosion to the south of the defences at Mappleton have increased significantly since the construction of defences at Mappleton.

Why are coastal Defences being extended to the south of Withernsea?

Rates of coastal erosion have increased to the south of the defences at Withernsea. This is because the material is trapped by the groynes along the seafront. This means beach material that is transported away by longshore drift is not replaced leaving little sediment on the beaches.

What are the 5 kinds of coastal protection?

Types of Coastal Protection Structures
  • Seawalls.
  • Bulkheads.
  • Groins.
  • Jetties.
  • Breakwaters.

Is rock armour soft or hard engineering?

Hard engineering – sea walls, groynes, rock armour

They are generally placed at the foot of vulnerable cliffs or at the top of a beach. They can be up to 5m high and can be flat faced or curved.

Are sea walls hard or soft?

Seawalls are hard engineered structures with a primary function to prevent further erosion of the shoreline.

Is rip rap Hard or soft engineering?

Examples of hard engineering strategies include sea walls, groynes, revetments, rock armour (rip rap), gabions and offshore breakwaters. Sea walls are often built at the foot of cliffs to prevent cliff erosion and subsequent collapse.

What are gabions sea Defence?

The purpose of a gabion revetment is to provide short term (5-10 years) protection from backshore erosion by absorbing wave energy along the dune face. Their application is restricted to the upper part of sandy beaches, since they are not sufficiently durable to withstand regular direct wave action.

What is a sea defense?

A beach acts as a coastal defence as it reduces wave impact and prevents inland flooding. However the beach needs to be properly managed to ensure it is wide and high enough to prevent it from being overtopped during high sea levels. This can be done through beach replenishment or beach recycling.

How does a sea wall protect the coast?

A seawall provides a high degree of protection against coastal flooding and erosion. It fixes the boundary between the sea and land which can be beneficial if important infrastructure or buildings are located on the shoreline. Seawalls have a lower space requirement than other coastal defences such as dikes.

How do sea Defences work?

They work by blocking part of the littoral drift, whereby they trap or maintain sand on their upstream side; and breakwaters: which are offshore concrete walls that break waves out at sea so that their erosive power is reduced when they reach the coast.

What coastal Defences are being used to prevent erosion?

Hard structural/engineering options use structures constructed on the beach (seawalls, groynes, breakwaters/artificial headlands) or further offshore (offshore breakwaters). These options influence coastal processes to stop or reduce the rate of coastal erosion.

Why are coastal Defences needed?

Coastlines need to be managed to prevent natural processes , such as erosion and flooding, destroying vulnerable areas of the coast. … A failure to prevent erosion and flooding can lead to a loss of life or property.

How does Cliff Stabilisation work?

Cliff stabilisation presupposes that the foot of the cliff has been stabilised. Stabilisation counteracts the natural behaviour of cliffs to slide and weather. Such an active cliff is part of the dynamic coastal landscape and should therefore in principle be maintained as an integrated part of this landscape.