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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.
Beach Erosion. Beach erosion occurs when waves and currents remove sand from the beach system. The loss of sand causes the beach to become narrower and lower in elevation (Figure 1).Storm waves carry the sand offshore, depositing and storing the sediment in large sandbars.each erosion occurs when waves and currents remove sand from the beach system. The loss of sand causes the beach to become narrower and lower in elevation (Figure 1).