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The photograph below shows an area at risk of damage due to coastal erosion - Junior Cycle Geography - Question b - 2022
Question b
The photograph below shows an area at risk of damage due to coastal erosion. You are concerned about the future of this area and that there may be a collapse. On th... show full transcript
Worked Solution & Example Answer:The photograph below shows an area at risk of damage due to coastal erosion - Junior Cycle Geography - Question b - 2022
Step 1
An example of a coastal defence measure that would be suitable to protect the area from future erosion.
Answer
Dear Councillor,
I am writing to you today as I am concerned about the future of this coastal area and that there may be a collapse. There are a number of ways that coastal areas can be protected either by rock armour, sea walls, gabions or groynes. However, I would suggest that the council use rock armour along the base of the cliff.
Step 2
An explanation of how the coastal defence measure you named will protect the area from the processes of coastal erosion.
Answer
Rock armour consists of large boulders of resistant rock, like basalt as an example. These large boulders are placed in front of the land to protect the land and the road directly behind the land from the force of destructive waves. It is the destructive waves that are causing undercutting, leading to an overhang and collapse. Eventually, the coastline begins to retreat, which is what is happening here. When rock armour is put in place, a destructive wave crashes into the boulders; it then loses its force and hydraulic action is reduced, so the coastline is protected from erosion. Rock armour is a quick and cheap way to protect our coastline. This has worked in other places around Ireland such as Lahinch in County Clare.
Thank you for reading my letter.
Kind regards, (Name)