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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.
Coastal erosion. The sea shapes the coastal landscape. Coastal erosion is the wearing away and breaking up of rock along the coast. Destructive waves erode the coastline in a number of ways: 1  Hydraulic action.2  Air may become trapped in joints and cracks on a cliff face. 3  When a wave breaks, the trapped air is compressed which weakens the cliff and causes erosion.4  Abrasion.oastal erosion is the wearing away and breaking up of rock along the coast. Destructive waves erode the coastline in a number of ways: 1  Hydraulic action. 2  Air may become trapped in joints and cracks on a cliff face. 3  When a wave breaks, the trapped air is compressed which weakens the cliff and causes erosion. 4  Abrasion.