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Coastal Landscapes

Coastal transport and longshore drift

  • 2 things to know
  • AS Unit 1

Overview

Four processes by which waves and currents transport sediment, transport in solution and transport in suspension.

What you need to know

Answer each one before you reveal it.

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Process

Describe the process of longshore drift.

Process

Name the four processes by which waves and currents transport sediment.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Name the four processes by which waves and currents transport sediment.

    Model answer

    Solution, suspension, saltation and traction.

  2. 2

    Explain transport in solution.

    Model answer

    Minerals dissolved from the rock, chiefly calcium carbonate, are carried invisibly within the water itself.

  3. 3

    Explain transport in suspension.

    Model answer

    Fine particles of silt and clay are held up within the turbulent water and carried along without touching the bed.

  4. 4

    Describe saltation as a transport process.

    Model answer

    Sand-sized grains are bounced along the sea bed in a series of short hops as turbulence lifts them and gravity returns them.

  5. 5

    Describe traction.

    Model answer

    Traction is the rolling or dragging of the largest particles, such as pebbles and boulders, along the sea bed by the force of the water.

  6. 6

    Which transport process moves the largest particles, and when does it operate?

    Model answer

    Traction, and it operates only when flow velocity is high, typically during storms.

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