Coastal Erosion

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A definition of coasts is

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Draggable item		Corresponding Item
Swash		Maximum distance wind blows over the sea
Backwash		The incoming wave, comes in at the same angle the wind blows
Contructive wave		The wave that returns to the sea, always at 90 degrees due to gravity
Destructive wave		Builds up the beach as the swash has energy to bring in sediment, but the backwash is weak so it gets left behind.
Fetch		Removes sediment from a beach as the backwash is strong enough to entrain particles and return them to the sea.

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