Waves Moving Material Along the Coast and Groynes (large print)

By: Rnib

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Synopsis: There are two plan images of beaches on this page, one at the top and one at the bottom of the page. An image border surrounds both images. There is a locator dot shown, which will be at the top left of the page when the image is the correct way up. In the top image the sandy beach is at the top and the sea at the bottom of the diagram. There is a dot representing material in the left middle of the image. Two diagonal arrows pointing up and right show the movement of the waves of the sea as they approach the beach. They point to a second dot at the edge of the beach. Two arrows point down the page showing backwash straight out to sea where there is a third dot. This pattern is repeated two more times, starting with the two diagonal arrows. This diagram shows that the diagonal onshore movement, and the backwash going straight back out to sea, will cause the material to move along the beach from left to right. The image at the bottom of the page shows the same movement of material but there is a groyne on the left, in the centre and on the right of the page. The groynes stop the material moving right across the beach, and it accumulates against the groyne.

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