Coasts

Important things for Coasts Topic AS Geog

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  • Created by: BexSnell
  • Created on: 22-05-12 18:55

Constructive/ Destructive Waves

Constructive

  • Swash > Backwash
  • Low and Flat
  • Lower Energy
  • 6-8 per minute
  • Depositional

Destructive

  • Backwash > Swash
  • Tall
  • Higher Energy
  • 10-12 per minute
  • Erosive
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Sand Dune Formation

Everybody Finds Munching Food Helps Survival

 

Embryo

Foredune

Main

Fixed

Heath

Slacks

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Isostatic/ Eustatic

Isostatic = LOCALISED - LAND

Eustatic = GLOBAL - SEA

 

Submergent = Rias - Fjords

Emergent = Raised Beach

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Coastal Flooding - Banglasdesh

Causes

  • 80cm of rain in one day
  • Heavy winds
  • Tropical Thunderstorms

Short Term

  • 350,000 deaths
  • Contaminated water
  • Loss of cattle

Long Term

  • Embankments flooded
  • 1hr journey to get fuel wood
  • Have to borrow money
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Coastal Flooding - North Sea, UK

Causes

  • Storm surge
  • Low pressure

Affects

  • Communities from Yorkshire to Essex
  • 300 deaths in Britain
  • Dutch coasts destroyed

Solutions

  • Thames Barrier
  • Delta Scheme
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Erosion - Holbeck Hall

Holbeck Hall - Scarborough, 1993

Causes

Crackes in the land due to 125mph winds

Effects

  • Hotel fell of cliff
  • Rotational cliff slumping
  • Several landslides
  • 3 days for whole hotel to be destroyed
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Erosion - Barton On Sea

Barton On Sea - Dorset Border, UK

Causes

Erosion of cliff up to 1m per year.

Responses

  • Hold the line
  • Managed retreat
  • Do nothing
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Hard Engineering - Barton On Sea

Caused by...

  • Groynes built in Bournemouth's beach.
  • Barton On Sea's beach starved of sand.

Geology led to rotaional slumping of the cliff!

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Soft Engineering - Pevensey Bay

East Sussex, protects over 15,000 properties.

Solutions

  • Reprofiling
  • Replenishment
  • Monitoring
  • Groynes
  • Wooden Retaining Wall
  • Tyres etc
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