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Coastline Erosion 3
Deposition. The rock flour produced by erosion on the coast and shore accumulates in the sea finally. The waves throw the rock flour on to the coast but the same comes back rolling down a slope coast and shore. Undertow also shifts the rock flour towards the sea.
Wave-Built platform. It is also known as wave-built terrace. Waves produce a platform on the coast by erosion and contribute to the retreat of cliffs. It is known as wave-built platform. As the waves throw cliffs backward by erosion and expands the wave-cut platform, the amount of rock flour increases. This rock flour helps the wave-built platform to expand towards the sea. If the sea suddenly gets very deep the expansion of this platform becomes slow.
Beach. The entire area along the sea extending from the lined reached by high tide and the highest storm waves to the low tide point is called beach. If the coast is surrounded by high hills of hard rocks, the beaches do not have deposition. It the coast is sandy, the beaches are of various types:
Fulls or Swells. Some ridges are formed parallel to the coast by sea waves. These are known as fulls or swells and the depressions between them are known as lows. Numerous swells and lows can be seen at the Lancashire coast.
Beach Cusps. Many shores at the coast are found to have been divided into pointed projections. These pointed projections towards the sea separated from each other by depressions are called beach cusps. Their formation has not been fully understood. Many beach cusps are seen at the coast in the English Channel. Many times violent storms destroy them.
Bars and Barriers. The deposition made by sea waves along the coast mostly have bars and barriers. The bars are submerged under the sea at the time of high tides while the barriers do not submerge.
Next: Coastline Erosion 4