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How are Beaches Shaped By Deposition?

How are Beaches Shaped By Deposition?. Wave Types. Constructive Waves They have a strong swash and a weak backwash. This allows a neat increase of material These waves are flatter and smaller than destructive waves Material spills forward building up on the beach. Wave Types.

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How are Beaches Shaped By Deposition?

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  1. How are Beaches Shaped By Deposition?

  2. Wave Types Constructive Waves • They have a strong swash and a weak backwash. • This allows a neat increase of material • These waves are flatter and smaller than destructive waves • Material spills forward building up on the beach.

  3. Wave Types Destructive Waves • Destructive waves are steep and high. • These waves have much more energy than constructive waves • Most of this is used by the backwash to transport material back down the beach. • Therefore the load is deposited below the low water mark. • Destructive waves are more common where the fetch is low.

  4. Long Shore Bars • At the lower edge of beaches sand accumulates to form longshore bands. • These are parallel to the waves • This material has probably been combed from the beach by destructive waves

  5. Runnels and Ripples Runnels • Runnels separate pools of standing water • This happens at low tide Ripples • As the slope of the beach increases small ripple marks appear • This is made as the tide moves over the beach.

  6. Beach Cusps • Material at the top of the beach is of a large calibre and this supports steeper concave slopes. • Beach cusps occur when this material is absorbing the wave swash

  7. Berms and Storm Beaches Berms • Large waves reaching the high tide limit build up ridges or berms Storm Beaches • These consist of larger pebbles and even boulders. • This forms only under high energy conditions of a surge or spring tide.

  8. By Deborah Durkin and Amy Smiles

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