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composed of sand, coastal erosion creates little problem for the beach because it uses this sand to Chapter 9 Beach Erosion and Loss 3 sustain the environment. After all, sand is the lifeblood of beaches. However, migrating upward and landward through space and time does create a huge problem for buildings and roads built too close to the shoreline. And therein lies the rub â protecting the land with a seawall will lead to beach loss.
The four main types of coastal erosion are Abrasion, Hydraulic action, Corrosion and Attrition. 1  Abrasion / Corrosion-Where sand and shingle are picked up by waves and scrap along the coastline.2  Hydraulic Action-The pounding affect of water on the coastline during storms. Abrasion / Corrosion-Where sand and shingle are picked up by waves and scrap along the coastline. 2  Hydraulic Action-The pounding affect of water on the coastline during storms. 3  Also water and air is compressed into joints and cracks and weakens the rock.