Large boulders known as rock armour are placed at the base of a cliff, sand dune or sea wall. When a wave breaks, it will hit the rock armour and lose its energy. This reduces erosion of the coastline.
An example can be seen at Strandhill, Co. Sligo.
Describe two ways that humans can protect the coastline from the destructive power of the sea. Use diagrams to support your answer.
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11.7 Coastal Management Case Study: North Bull Island, Co. Dublin
North Bull Island is located in Dublin Bay. It exists as a result of coastal decisions made over 200 years ago.
In the early nineteenth century, longshore drift was carrying large amounts of sand and silt into Dublin Bay. The deposits were partially blocking the mouth of the harbour, making it difficult for ships to enter.
A survey was carried out and it was decided that walls would be built on both sides (north and south) of Dublin Harbour.
