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Coastal Landscapes

Tombolos, cuspate forelands and sandy coastlines

  • 2 things to know
  • Component 1 Section A

Overview

How a tombolo forms, tombolo outside the UK and cuspate foreland.

What you need to know

Answer each one before you reveal it.

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Key term

Define a tombolo.

Key term

Explain how a tombolo forms.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define a tombolo.

    Model answer

    A tombolo is a ridge of sand or shingle that joins an island to the mainland. Deposition links the two once wave energy between them is reduced.

  2. 2

    Explain how a tombolo forms.

    Model answer

    Waves refract around an offshore island and meet in its lee, cancelling much of their energy. Sediment carried alongshore is deposited in that low energy shadow until a ridge links the island to the shore.

  3. 3

    Give the UK's best known tombolo and describe it.

    Model answer

    Chesil Beach in Dorset is a shingle tombolo about 29 km long linking the Isle of Portland to the mainland. The lagoon called the Fleet lies behind it.

  4. 4

    Name a tombolo outside the UK.

    Model answer

    The town of Monte Argentario in Tuscany, Italy, is joined to the mainland by two tombolos. St Ninian's Tombolo in Shetland is the finest sand example in Britain.

  5. 5

    Define a cuspate foreland.

    Model answer

    A cuspate foreland is a triangular accumulation of sediment projecting seaward from the coast. Two sets of ridges built by opposing drift directions form the two sides.

  6. 6

    Explain the formation of a cuspate foreland.

    Model answer

    Longshore drift operates from two opposing directions along the same stretch of coast. Sediment converges and builds outward as a series of ridges, producing a triangular headland of shingle.

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