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Coasts revision (Sea defence (Sea wall (Made of stone or concrete.…
Coasts revision
Sea defence
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Rip-rap
Large interlocking man-made wall. works by absorbing and deflecting the impact of a wave before the wave reaches the defended structure.
Beach rebuilding
Beach rebuilding is where you add the sand that is missing. It is quite cheap but not very effective
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Groynes
Groynes a low wall or sturdy barrier built out into the sea from a beach to check erosion and drifting.
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What are waves?
What influences them
Destructive
Destructive slopes the beach down steeply. Destructive waves have a stronger backwash. Destructive have more erosional properties.
Constructive
Constructive slopes the beach down slowly. Constructive waves have a stronger swash. Constructive don’t have steep beaches
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Process of erosion
4 types
Abraison
Pebbles and sand get flung against the rock, scraping and scouring it away
Attrition
Rock fragments and pebbles are flung against each other, wearing each other away.
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