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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 erosion of beaches and dunes, especially foredunes, may be a natural process and is often balanced by the supply of sand from the nearshore continental shelf to beaches by currents and waves [3,4]. In some cases, sand from adjacent dunes may replenish beach systems during erosional periods [3].isted below are some human activities that have modified dunes and that can induce dune erosion, which may accelerate beach erosion. 1  Loss of dune vegetation caused by grazing, fires, tracks (four-wheel drives, motor bikes, horses and dogs) and even foot traffic [9].