Swanage

Decision Making Exercise

Where is Swanage?

SwanageBeach narrows

Wide beach

Longshore drift from south to north

Longshore Drift

Foreshore Pebbles and sediment

moved onto beach

Pebbles and sediment

moved back down the

beach

Pebbles and sediment

moved onto beach

Pebbles and sediment

moved back down the

beach

Pebbles and sediment

moved onto beach

Swanage

Longshore drift from south to north

Sediment is moved from south to north

Banjo Pier

Groynes

The groynes extend at right angles to the beach and act like arms to catch sediment. These groynes are very old and run down.

The sea at work

The beach is hit by strong waves which have travelled across the Atlantic Ocean. Groynes are designed to trap sand and sediment and to

encourage deposition.

Powerful waves

Swanage Banjo Pier

Makes people’s homes safer and insurance

premiums lower.

Built at right angles to the beach

Contains an outflow for the River Swan.

Reduces the risk of flooding in the town by moving run-

off into the sea very quickly.

Beach south of the PierBeach is wide and sandy. Deposition is taking place.

The beach is hit by strong waves which have travelled across the Atlantic Ocean.

Wide variety of tourist services and attractions.

Beach South of the Pier facing the NorthBeach is wide and sandy.

Deposition is taking place.

Sand and pebbles are building up against the pier

Less sand and sediment is carried past the pier.

Beach north of the pierSea wall to protect houses and road from flooding and erosion.

Old groynes which were to trap sediment and sand.

Beach is narrower north of the pier.

The pier is stopping as much sand and sediment getting to this part of the

beach.

Where the sea meets the cliffTop layers of cliff are permeable

Beach huts and other tourist facilities are very close to the edge of the

beach.

Cliff erosionTop layers of cliff are permeable

Lower layers of cliff are impermeable

Rotational Landslips

Erosion and landslipping has become worse since

the Banjo Pier was built

Landslip HazardErosion and landslipping has become worse since the Banjo Pier was built

Landslips are threatening human activities such as this path.

The Banjo Pier is blocking the sand and sediment that used to be deposited here.

Landslip Hazard

Permeable layers at top of

cliff.

Impermeable layers at bottom

of cliff.

Most recent landslip blocking the path.

Managing the LandslipsSteel piling is inserted into lower cliff.

Pipes put into cliff to drain off water.

Concrete reinforcements to help stabilise the cliff (stop it from slipping).

Groynes at work

Beach north of the pier