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Coastal Landscapes

Tides and coastal currents

  • 3 things to know
  • AS Unit 1

Overview

Diurnal tidal cycle, tidal range and neap tide.

What you need to know

Answer each one before you reveal it.

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Key term

What is meant by a diurnal tidal cycle?

Key term

Most of the UK coast experiences which tidal pattern?

Key term

Define tidal range.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What causes tides?

    Model answer

    The gravitational pull of the Moon, and to a lesser extent the Sun, on the oceans, combined with the rotation of the Earth.

  2. 2

    What is meant by a diurnal tidal cycle?

    Model answer

    A tidal pattern with one high tide and one low tide in each period of roughly 24 hours.

  3. 3

    Most of the UK coast experiences which tidal pattern?

    Model answer

    A semi-diurnal pattern, with two high tides and two low tides in roughly 24 hours.

  4. 4

    Define tidal range.

    Model answer

    Tidal range is the vertical difference in water level between high tide and low tide.

  5. 5

    When do spring tides occur, and what is their effect?

    Model answer

    Spring tides occur when the Sun and Moon are aligned at new and full moon, producing the largest tidal range of the cycle.

  6. 6

    What is a neap tide?

    Model answer

    A tide occurring when the Sun and Moon are at right angles to the Earth, so their pulls partly cancel and the tidal range is at its smallest.

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