Name the world's first large tidal power station.

La Rance in Brittany opened in 1966 with a capacity of 240 MW. The scheme remained the world's largest for over forty years.

Which tidal power station is now the largest?

Sihwa Lake in South Korea has a capacity of 254 MW and opened in 2011. The turbines were built into an existing sea wall.

Distinguish a tidal barrage from a tidal stream scheme.

A barrage dams an estuary and generates from the head difference between the two sides. A tidal stream scheme places underwater turbines in a fast current with no barrier.

Eduqas A-Level Geography A110QS

Coastal LandscapesLandscape

Topic overview The coast as a system: inputs, outputs, stores and transfers Sediment sources, sediment cells and dynamic equilibrium Tides, currents and wave types High and low energy coastal environments Fetch, wave refraction and wave reflection Lithology and structural geology at the coast Sub-aerial weathering and mass movement at the coast Marine erosion processes Cliffs, wave-cut platforms, geos and blowholes Headlands, bays and the cave to stump sequence Coastal transport and longshore drift Coastal deposition, flocculation and sediment sorting Beaches, spits and bars Tombolos, cuspate forelands and sandy coastlines Coastal sand dunes and aeolian processes Estuarine coastlines, tidal flats and salt marshes Coral reefs and mangrove coastlines Storms, seasons and sea level change Coastal processes and human activity Human impacts and coastal management

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Energy Challenges and DilemmasContemporary theme

Topic overview Classifying energy resources Fossil fuel stocks, reserves and their global distribution Geological factors in energy supply Insolation, wind strength and reliability Relief, dam sites and hydroelectric power Waves, tides and biofuels: favourable locations Changing global patterns of energy demand Economic and technological influences on energy demand Transfers, storage and the pricing of oil and gas OPEC, national governments and the oil and gas companies Environmental problems of energy extraction, transport and use Political, economic and technological problems of energy Appropriate technology and micro-generation in developing countries National energy mixes and world energy prices Demand reduction and energy efficiency policies Clean fossil fuel technologies and the sustainability of alternatives

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Topic overview Structure of the atmosphere The atmospheric heat budget Global atmospheric circulation and the tricellular model Pressure belts and planetary surface winds Oceanic circulation, continentality and altitude The world's major climate types The ITCZ and seasonal migration The monsoon climate The climate of the UK Air masses affecting the UK The jet stream and UK weather ENSO and short-term climate change Vulnerability, resilience and adaptive capacity Hazards of low- and high-pressure systems and their management Urban climates and air quality Climate change: shifting belts, tipping points and response

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Energy Challenges and Dilemmas

Waves, tides and biofuels: favourable locations

3 things to know
Component 3 Section B

Overview

Tidal potential of the Severn Estuary, world's first large tidal power station and food versus fuel argument.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

What tidal range is needed for a tidal barrage?

Key term

Why do estuaries have larger tidal ranges than open coasts?

Key term

Describe the tidal potential of the Severn Estuary.

Questions from this subtopic

Each one with the model answer underneath.

1
What tidal range is needed for a tidal barrage?
Model answer
A tidal barrage generally needs a mean tidal range of at least 5 m. Smaller ranges cannot drive the turbines economically.
2
Why do estuaries have larger tidal ranges than open coasts?
Model answer
A funnel-shaped estuary narrows and shallows, which forces the tidal wave to rise higher. Resonance with the tidal period can amplify the range further.
3
Describe the tidal potential of the Severn Estuary.
Model answer
The Severn Estuary has a spring tidal range approaching 15 m, among the largest in the world. A barrage there could supply several per cent of United Kingdom electricity.
4
Name the world's first large tidal power station.
Model answer
La Rance in Brittany opened in 1966 with a capacity of 240 MW. The scheme remained the world's largest for over forty years.
5
Which tidal power station is now the largest?
Model answer
Sihwa Lake in South Korea has a capacity of 254 MW and opened in 2011. The turbines were built into an existing sea wall.
6
Distinguish a tidal barrage from a tidal stream scheme.
Model answer
A barrage dams an estuary and generates from the head difference between the two sides. A tidal stream scheme places underwater turbines in a fast current with no barrier.

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