Swanage power point presentation (reduced)
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Transcript of Swanage power point presentation (reduced)
![Page 1: Swanage power point presentation (reduced)](https://reader033.fdocuments.net/reader033/viewer/2022061207/5478d0b5b4795990098b45cc/html5/thumbnails/1.jpg)
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Swanage
Decision Making Exercise
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Where is Swanage?
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SwanageBeach narrows
Wide beach
Longshore drift from south to north
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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
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Swanage
Longshore drift from south to north
Sediment is moved from south to north
Banjo Pier
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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.
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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.
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Powerful waves
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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.
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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.
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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.
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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.
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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.
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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
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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.
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Landslip Hazard
Permeable layers at top of
cliff.
Impermeable layers at bottom
of cliff.
Most recent landslip blocking the path.
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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).
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Groynes at work
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Beach north of the pier