Coastal landscapes

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32 Terms

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Deposition
When waves carrying sediment loose energy and slow down
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Mechanical weathering
Breakdown of rock without changing its chemical composition. e.g; freeze thaw weathering.
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Chemical weathering
Breakdown of rock by changing its chemical composition. eg; carbonation
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Storm surges
When temporary sea level rises becuase strong winds push water onshore
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Destructive waves
When waves erode the coast
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Constructive waves
When waves deposit material
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Hydraulic Power
Waves crash again rock and compress air in the cracks. This puts pressure on the rock. Repeated compression widens the cracks and causes bits of rock to break off.
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Abrasion
Eroded particles in the water scrape and rub against rock, removing small pieces.
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Attrition
Eroded particles in the water collide, break into smaller pieces and become more rounded.
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Traction
Large particles like boulders are pushed along the sea bed by the force of water
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Suspension
Small particles like silt and clay are carried along in the water
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Saltation
Pebble sized particles are bounced along the sea bed by the force of water
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Solution
Soluble materials like limestone dissolve in the water and are carried along
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Hard engineering
Man made structures built to control the flow of the sea and reduce flooding and erosion
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Soft engineering
Schemes set up using knowledge of the sea and its processes to reduce the effects of flooding and erosion.
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Sea wall
A wall made out of hard material like concrete that reflects waves back to sea
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Benefits of a sea wall
Prevents erosion of the coast and acts a barrier to prevent flooding
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Disadvantages of a sea wall
It creates a strong back wash that erodes under the wall and expensive to maintain
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Gabions
A wall of wire cages filled with rocks, usually built at the foot of cliffs
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Advantages of Gabions
Absorb wave energy, reducing erosion. They’re cheap and easy to build.
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Disadvantages of Gabions
They’re ugly to look at and wire cages erode over time
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Rock armour
Boulders that are piled up along the coast
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Disadvantages of rock armour
Absorbs wave energy, reducing erosion and flooding and a cheap defence.
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Groynes
Wooden or stone fences that are built at right angles to the coast. They trap material transported by longshore drift.
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Advantages of groynes
They create wider beaches which slow the waves. This gives greater protection from flooding and erosion and fairly cheap.
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Disadvantages of groynes
They starve beaches further down the coast of sand making them narrower. Narrow beaches don’t protect them well leading to greater erosion
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Beach nourishment and reprofiling
Sand and shingle from the sea bed or lower down the beach added to upper part of the beach
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Beach nourishment and reprofiling advantages
It creates wider beaches which slow down the waves. This gives greater protection from erosion and flooding
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Beach nourishment and reprofiling disadvantages
Taking material from the sea bed can kill organisms like sponges or corals. it’s very expensive and has to be repeated to maintained
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Dune regeneration
Creating or restoring sand dunes through nourishment or planting vegetation to stabilise the sand
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Dune regeneration advantages
Creates a barrier between land and sea and absorbs wave energy preventing flooding and erosion and stabilisation cheap
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Dune regeneration disadvantages
This protection is limited to a small area and nourishment is expensive