... coastal management features such as groynes which stop Long Shore Drift (LSD). The land around Swanage Area is made up of four different types of rocks; tertiary sands and clays is a very soft type of rock which erodes at a very high rate. Chalk is the hardest of all rocks. This is where erosion takes longest. Wealden clay is very similar to the first type of rock. It erodes very rapidly and can cause many problems near the coast (i.e. cliff erosion). The last type of rock is also very vulnerably to acid rains and normal erosion caused by waves. The coastal landforms found in this area are caused mainly by the rate of erosion. Here the waves can be very large because the wave fetch is quite long (approximately 450 km).The waves hit the cliffs at very high speeds causing rotational slumping. This means that the base of the ...

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