9.1.8

Coastal Deposition

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Coastal Deposition

Coastal deposition describes the sea dropping sediment (or material) being carried by the water at the coastline. Coasts grow in size when more sediment is deposited on the coast than is lost to the process of erosion.

Why does deposition happen?

Why does deposition happen?

  • Deposition happens when constructive waves break on the shore. The sediment being carried by the sea is put (deposited) on the coastline.
  • This usually creates beaches made of sand or shingle in the area between the 'high' water mark and the 'low' water mark.
  • The high water mark is the point the highest up the beach that the sea level rises to.
  • The low water mark is the point the lowest down the beach that the sea level falls to.
Water marks

Water marks

  • An image of high and low water marks.
What increases the amount of deposition?

What increases the amount of deposition?

  • If erosion on the nearby coast is high, then lots of rock and sand will fall into the ocean. This will increase deposition on nearby beaches.
  • The more sediment in the ocean, the more deposition there will be.
Why are some beaches sandy?

Why are some beaches sandy?

  • Sandy beaches are created by sand being deposited on the shoreline.
  • Sandy beaches are usually very long, wide, and flat because particles of sand are very small and easy to wash back into the ocean with the backwash.
  • Shingle beaches are made when pebbles and shingle are deposited on the coast. Shingle and pebbles are big and hard to wash back into the ocean, so they build up (making short and steep beaches).
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1

Geography Skills

1.1

Mapping

1.1.1Map Making1.1.2OS Maps1.1.3Grid References1.1.4Contour Lines1.1.5Symbols, Scale and Distance1.1.6Directions on Maps1.1.7Describing Routes1.1.8Map Projections1.1.9Aerial & Satellite Images1.1.10Using Maps to Make Decisions
1.2

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3.1

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4

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4.1

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6.1

Tourism

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Natural Resources

7.1

Rocks

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Rivers

8.1

River Processes & Landforms

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Formation of Coastal Landforms

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Overview of Glaciers & How They Work

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Earthquakes

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India - Physical Geography

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Analysis of Bangladesh

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Bangladesh Physical Geography

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Russia's Human Geography

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Practice questions on Coastal Deposition

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    What type of waves cause coastal deposition?Multiple choice
  2. 2
    What increases the amount of coastal deposition taking place?Fill in the list
  3. 3
    What do we call the dropping of material in seawater onto the coast?Multiple choice
  4. 4
    The process of longshore drift forms which two features?Multiple choice
  5. 5
    How is a lagoon created?Multiple choice
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Longshore Drift

Spits, Bars & Sand Dunes