The coast

Mind Map by jeacur, updated more than 1 year ago
Created by jeacur over 6 years ago


GCSE Geography (Physical) Mind Map on The coast, created by jeacur on 05/21/2013.

Resource summary

The coast
1 Defenition: The coast is the area of contact between the land and the sea. These can be narrow strips, with cliffs, or expansive areas, such as wide sandy beaches or mudflats
2 Waves
2.1 The fetch - longer = powerful
2.2 The strength of the wind
2.3 The duration of the wind
2.4 Britain's biggest wave: the Cribbar off Fistral Beach, Newquay, Cornwall
2.5 Constructive
2.5.1 Smaller in height
2.5.2 'A powerful wave with a strong swash that surges up the beach'
2.5.3 They carry large amounts of sediment and 'construct' the beach
2.5.4 Distance storms can be 100s of Km away
2.5.5 6-8 per minute, loved by surfers, frequent in summer and well spaced apart, push them up the beach
2.6 Destructive
2.6.1 Taller
2.6.2 'A wave formed by a local storm that crashed down onto a beach and has a strong backwash
2.6.3 They 'destroy' the beach when they pull the sand back with strong backwash
2.6.4 13-15 per minute
2.6.5 Local storms close to the coast
3 Marine/wave processes
3.1 Coastal erosion
3.1.1 Hydraulic action The sheer power of the waves lashes the coast, forcing air into tiny cracks. The pressure of the compressed air, blasted into holes and cracks in the rocks weakens it and eventually causes the rock to break apart
3.1.2 Corrasion and abrasion corrasion: the sea hurls fragments of rock at a coast which scrape and gouge the coast Abrasion: a sandpapering effect of pebbles grinding over a rocky platform making it smooth
3.1.3 Corrosion/solution Dissolving of rocks such as limestone and chalk. Calcium carbonate in these rocks reacts with the slightly acidic sea water
3.1.4 Attrition Rocks and stones carried by the sea are knocked into one another, making themselves smaller and more rounded, helps to form out beaches
3.2 Coastal transportation
3.2.1 Traction Large pebbles are rolled along the seabed
3.2.2 Saltation A 'hopping' or 'bouncing' motion of particles too heavy to be suspended
3.2.3 Suspension Particles carried/suspended within the water
3.2.4 Solution Dissolved chemical often derived from limestone or chalk
3.2.5 Longshore drift Transportation along the coast
3.3 Coastal deposition
3.3.1 When the sea loses energy it drops the sand, rock particles and pebbles it has been carrying
3.3.2 It occurs when: Swash is stronger than the backwash Waves enter an area of shallow water Waves enter a sheltered area e.g. cove/bay There is little wind There is a good supply of material
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