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coastal defence - Coggle Diagram
coastal defence
Rock armour
Lahinch
protects coasts during storms
loarge bolders placed in front of coastline
reduces the effect of hydraulic action
The waves breaks on the rocks before hitting the coastline.
Groynes
placed at right angles along the beach
stop longshore drift
barriers wood/stone
barriers trap sand deposited by the swash
Rosslare
sea walls
stop hydraulic action
lahinch
curved wallls
Gaibons
protect the coastline
stop hydraulic action and abrasion
wire cages filled with stones