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Coastal Landscapes

Depositional landforms of sandy coasts

  • 2 things to know
  • AS Unit 1

Overview

Formation of a beach, formation of a spit and recurved end.

What you need to know

Answer each one before you reveal it.

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Key term

Describe the formation of a beach.

Key term

Describe the formation of a spit.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Describe the formation of a beach.

    Model answer

    Constructive waves deliver more sediment up the shore than the backwash removes, so sand and shingle accumulate between the low water mark and the cliff or dune behind.

  2. 2

    What is a berm?

    Model answer

    A berm is a ridge of sediment on the upper beach marking the limit reached by the swash of a recent high tide.

  3. 3

    Describe the formation of a spit.

    Model answer

    Longshore drift carries sediment past an abrupt change in the direction of the coastline, and the material is deposited in the sheltered water beyond, building a ridge out from the shore.

  4. 4

    Why does the end of a spit often curve landward?

    Model answer

    Waves arriving from a secondary direction, and refraction around the tip, push the distal end into the more sheltered water behind it.

  5. 5

    What forms in the sheltered water behind a spit?

    Model answer

    A salt marsh or mudflat, because the spit shelters the water so that fine sediment can settle and vegetation can colonise.

  6. 6

    What is a recurved end, and what does a series of them record?

    Model answer

    A recurved end is a hooked ridge at the tip of a spit, and a series of them records earlier positions of the tip as the spit has grown.

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AFew coastal people recognised the signs.
BThe coasts were densely populated.
CMany communities were struck with no notice at all.

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The Mariana Trench reaches almost 11,000 m below sea level.
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